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SC101Exposure lamp error

The white level peak did not reach
the prescribed threshold when the
white plate was scanned.
• Dirty optics
• Dirty white plate
• Exposure lamp defective
• Exposure lamp does not turn on
• Lamp stabilizer defective
• High voltage line leak
• SIB defective
• SBU defective
SC120Scanner home position error 1

The scanner home position sensor
did not detect the home position
(did not go OFF) after the scanner
moved forward 20 mm..
• Scanner motor defective
• Scanner HP sensor defective
• Harness between scanner motor and
SIOB disconnected or broken.
• SIOB defective
SC121Scanner home position error 2

The scanner home position sensor
did not go ON after the scanner
moved forward 6 mm and the feeler
entered the HP sensor.
• Scanner motor harness loose, broken,
defective
• Scanner motor defective
• Scanner HP sensor disconnected,
defective
• SIOB defective
SC141Black level detection error


During AGC the value for black level was
not within ±3 of the prescribed value.
• SBU defective
• Harness defective
• Check harnesses between SBU
and IPU
• IPU defective
• VBCU defective
SC142White level detection error

During AGC the value for white
level was not within -7 of the
prescribed value.
• Exposure lamp defective
• Harness disconnected, damaged
• Dirty exposure glass, optics
• Scanner motor, drive assembly defective
• SBU board defective
SC143SBU Auto Adjust Error

At power on the automatic white
level adjustment failed.
• Clean the white plate
• Clean the optics and lenses
• Check the connectors between the SBU and
IPU.
• Replace the SBU
• Replace the IPU
• Replace the VBCU
• Replace the exposure lamp
SC144SBU communication error

When the machine is switched on, or when
the machine returns to full operation from the
energy save mode, the machine can not
access the SBU register, or the SBU register
values are abnormal.
Note: The ASIC IDs read during automatic
adjustment of the SBU can be displayed with
SP4600.
• SBU harness loose,
disconnected, defective
• SBU board defective
• VBCU defective
SC161IPU error

Communication error between IPU,
SBU, and VBCU.
• Check harness connections between SBU
and IPU/VBCU
• IPU defective
• VBCU defective
SC165Illegal Copy Prevention Error

An abnormality was detected with
the ICIB board at power on.
• ICIB connected incorrectly
• ICIB defective
SC180Scanner fan lock

The fan motor next to the SIOB
did not switch on within 10 sec.
after the CPU issued the ON
signal.
• Fan defective
• Foreign object interfering with operation of
fan
• Motor harness loose, disconnected, or
broken
• SIOB defective
SC181Scanner Fan Error: Lamp Stabilizer

The exposure lamp regulator
fan is not rotating.
• Check the fan connections
• Fan defective
• Check SBU connection
• Check SIOB connection
• SBU defective
• SIOB defective
SC182Scanner Fan Error: Right Side

The fan located on the right side of
the exposure unit is not rotating
• Check the fan connections
• Fan defective
• Check SBU connection
• Check SIOB connection
• SBU defective
• SIOB defective
SC195Machine serial number error

The number registered for the
machine serial number does not
match.
• Confirm the correct serial number of the
machine in the specifications
• Important: When SC195 occurs, the serial
number must be input. Please contact your
technical supervisor
SC202Polygon motor error: ON timeout

The polygon mirror motor does not
reach the targeted operating speed
within the prescribed time.
• Harness to polygon motor drive board
disconnected, defective
• Polygon motor defective
• Polygon motor drive board defective
• Polygon motor defective
SC203Polygon motor error: OFF timeout

The polygon mirror motor does
leave the READY status within 3
seconds after the polygon motor
switches off.
• Harness to polygon motor driver board
disconnected, defective
• Polygon motor defective
• Polygon motor driver board defective
• Polygon motor defective
SC204Polygon motor error: XSCRDY signal error

The polygon motor stopped
operating while the LD unit was
firing.
• Harness to polygon motor driver board
disconnected, defective
• Polygon motor defective
• Polygon motor driver board defective
SC210Laser beam detection error: K (Black)
SC211Laser beam detection error: Y (Yellow)
SC212Laser beam detection error: M (Magenta)
SC213Laser beam detection error: C (Cyan)

The laser synchronization sensor
failed to detect the beginning and
end of the laser beam flash for the
designated color onto the polygon
mirror while the mirror is rotating at
the prescribed number of revolutions
• Laser synchronization detector
sensor connection loose, not
connected
• Laser synchronization detector
sensor defective
• LD unit defective
• IPU defective
• VBCU defective
SC220Laser Synchronization Detector Error: K Leading Edge: LD0

While the polygon motor is rotating
normally, no synchronizing
detection signal is output for LD0
black, or leading edge, even after
the laser diode has been firing for 2
sec.
• Harness between the laser synchronizing
detector and I/F unit is disconnected,
defective
• Check all connections between LD unit,
LDB, IPU
• LD unit
• LDB defective
• IPU defective
SC221Laser Synchronization Detector Error: K Leading Edge (Not LD0)

While the polygon motor is rotating
normally, no synchronizing detection
signal is output for black, leading edge for
any LD other than LD0.
• Harness between the laser
synchronizing detector and I/F unit
is disconnected, defective
• Check all connections between LD
unit, LDB, IPU
• LD unit
• LDB defective
• IPU defective
SC222Laser Synchronization Detector Error: Y Leading Edge: LD0

While the polygon motor is rotating
normally, no synchronizing
detection signal is output for LD0
yellow, leading edge.
• Harness between the laser synchronizing
detector and I/F unit is disconnected,
defective
• Check all connections between LD unit,
LDB, IPU
• LD unit
• LDB defective
• IPU defective
SC223Laser Synchronization Detector Error: Y Leading Edge (Not LD0)

While the polygon motor is rotating
normally, no synchronizing
detection signal is output for yellow,
leading edge for any LD other than
LD0.
• Harness between the laser synchronizing
detector and I/F unit is disconnected,
defective
• Check all connections between LD unit,
LDB, IPU
• LD unit
• LDB defective
• IPU defective
SC224Laser Synchronization Detector Error: M Leading Edge: LD0
While the polygon motor is rotating
normally, no synchronizing
detection signal is output for LD0
magenta, leading edge.
• Harness between the laser synchronizing
detector and I/F unit is disconnected,
defective
• Check all connections between LD unit,
LDB, IPU
• LD unit
• LDB defective
• IPU defective
SC225Laser Synchronization Detector Error: M Leading Edge (Not LD0)

While the polygon motor is rotating
normally, no synchronizing
detection signal is output for
magenta, leading edge for any LD
other than LD0
• Harness between the laser synchronizing
detector and I/F unit is disconnected,
defective
• Check all connections between LD unit,
LDB, IPU
• LD unit
• LDB defective
• IPU defective
SC226Laser Synchronization Detector Error: C Leading Edge: LD0

While the polygon motor is rotating
normally, no synchronizing
detection signal is output for LD0
cyan, leading edge.
• Harness between the laser synchronizing
detector and I/F unit is disconnected,
defective
• Check all connections between LD unit,
LDB, IPU
• LD unit
• LDB defective
• IPU defective
SC227Laser Synchronization Detector Error: C Leading Edge (Not LD0)

While the polygon motor is rotating
normally, no synchronizing
detection signal is output for cyan,
leading edgefor any LD other than
LD0.
• Harness between the laser synchronizing
detector and I/F unit is disconnected,
defective
• Check all connections between LD unit,
LDB, IPU
• LD unit
• LDB defective
• IPU defective
SC230FGATE error: Feedback remains HIGH for K write

After the start of timing to create the
black image, the PFGATE register of
the GAVD did not assert
• Harness between the VBCU and LDB unit
disconnected, loose, or defective.
• LD unit defective
• IPU defective
• Controller board disconnected, defective
• HDD defective
SC231FGATE error: Feedback remains LOW for K write

After the start of timing to create
the black image, the PFGATE
register of the GAVD did not
assert.
• Harness between the VBCU and LDB unit
disconnected, loose, or defective.
• LD unit defective
• IPU defective
• Controller board disconnected, defective
• HDD defective
SC232FGATE error: Feedback remains HIGH for Y write

After the start of timing to create
the yellow image, the PFGATE
register of the GAVD did not
assert.
• Harness between the VBCU and LDB unit
disconnected, loose, or defective.
• LD unit defective
• IPU defective
• Controller board disconnected, defective
• HDD defective
SC233FGATE error: Feedback remains LOW for Y write

After the start of timing to create the
yellow image, the PFGATE register
of the GAVD did not assert.
• Harness between the VBCU and LDB unit
disconnected, loose, or defective.
• LD unit defective
• IPU defective
• Controller board disconnected, defective
• HDD defective
SC234FGATE error 1: Feedback remains HIGH for M write

After the start of timing to create the
magenta image, the PFGATE
register of the GAVD did not assert
• Harness between the VBCU and LDB unit
disconnected, loose, or defective.
• LD unit defective
• IPU defective
• Controller board disconnected, defective
• HDD defective
SC235FGATE error: Feedback remains LOW for M write

After the start of timing to create the
magenta image, the PFGATE
register of the GAVD does not
assert.
• Harness between the VBCU and LDB unit
disconnected, loose, or defective.
• LD unit defective
• IPU defective
• Controller board disconnected, defective
• HDD defective
SC236FGATE error 1: Feedback remains HIGH for C write

After the start of timing to create the
cyan image, the PFGATE register of
the GAVD did not assert.
• Harness between the VBCU and LDB unit
disconnected, loose, or defective.
• LD unit defective
• IPU defective
• Controller board disconnected, defective
• HDD defective
SC237FGATE error: Feedback remains LOW for C write

After the start of timing to create the
cyan image, the PFGATE register of
the GAVD does not assert
• Harness between the VBCU and LDB unit
disconnected, loose, or defective.
• LD unit defective
• IPU defective
• Controller board disconnected, defective
• HDD defective
SC240LD error: K
SC241LD error: Y
SC242LD error: M
SC243LD error: C

An error occurred at the LD error
terminal of the K, Y, M, or C LD
driver after initialization of the LD
because the power to the LD was
higher or lower than the prescribed
limit.
• LD defective due to wear, damage, short
circuit
• LDB harness disconnected, loose or
defective
SC268Optical unit sensor error

At power on, one of the two
temperature sensors in the optics
unit detected a temperature lower
than -10°C.
-or-
It detected a temperature higher
than 80°C.
• Thermistor disconnected (causes
extremely low temperature reading)
• Thermistor damaged and short circuited
(causes extremely high temperature
reading)
• VBCU defective
SC270Skew Control Upper Lower Limit: Y

The pulse total for Yellow skew
control is not within the prescribed
range.
• ITB not installed correctly.
• ITB defective
• Optical unit installed incorrectly
• Optical unit defective
SC271Skew Control Upper Lower Limit: M

The pulse total for Magenta skew
control is not within the prescribed
range.
• ITB not installed correctly.
• ITB defective
• Optical unit installed incorrectly
• Optical unit defective
SC272Skew Control Upper Lower Limit: C

The pulse total for Cyan skew control
is not within the prescribed range.
• ITB not installed correctly.
• ITB defective
• Optical unit installed incorrectly
• Optical unit defective
SC285MUSIC Continuous Failure

The MUSIC adjustment failed after
four attempts.
• Fusing belt installed incorrectly
• Fusing belt surface scoured, scratched
• MUSIC sensors dirty, defective
SC300Drum charge corona wire error: K

The output of the charge corona
wire of the black PCU is abnormal
• CGB power pack connection loose,
broken defective
• Check CGB power pack connection to
BCU
• CGB power pack defective
• BCU defective
• Replace OPC drum
SC301AC charge output error: M
SC302AC charge output error: C
SC303AC charge output error: Y

An interrupt checks the status of the power pack every 10 ms. This SC is issued if the
VBCU detects a short in the AC charge for M, C, Y.
• Disconnect the high voltage cable from Terminal C of the multiple high-voltage
supply board.
• Attach a voltmeter to the terminal.
• If there is no output from the terminal, replace the high voltage power supply.
-or-
• If there is output from the terminal, test the resistance between the high voltage
cable and the ground. If resistance is nearly "0", check the high-voltage harness
for defects and replace it if necessary.
• Test the conductivity between the OPC unit and the ground. If there is no
conductivity between the OPC unit and ground, replace the OPC unit.
• If there is no charge PWM signal, replace the harness and/or VBCU.
SC304Charge Corona Error: Charge Leak (K PCU)

A abnormal detection signal (H)
was detected for longer than
250 ms
• Turn the machine power off/on
• CGB power pack harness connectors loose,
broken, defective
• Corona wire caps loose, missing
• CGB power pack defective
• Charge corona unit connectors loose, broken,
defective
SC308Charge Corona Error: Wire Cleaner Error (K PCU)

The charge corona wire cleaner motor
remained locked after the motor was
switched on, or failed to switch off within
the prescribed time after cleaning
started.
• Turn the machine power off/on
• Motor overloaded due to a physical
obstruction
• Motor defective
SC313Charge, development error: M
SC314Charge, development error: C
SC315Charge, development error: Y

After the M, C, or Y drum started to
rotate, the feedback for the charge
unit of the color dropped below
0.3V.
• Make sure that the settings of SP2202
are at the defaults.
• Check harness connections between
charge roller and transfer power pack.
• Defective charge roller
• Defective power pack
SC316Drum Charge Error: K
SC317Drum Charge Error: M
SC318Drum Charge Error: C
SC319Drum Charge Error: Y

Drum charge output voltage
(Vpp) exceeded 2.8 kV.
• Check the connections of the charge unit of
the PCU where the problem occurred.
• Replace the charge unit of the PCU (CBG
power pack for the K PCU, charge roller unit
for YMC PCUs)
SC320Development power pack error: K
SC321Development power pack error: M
SC322Development power pack error: C
SC323Development power pack error: Y

This SC is issued if the VBCU
detects a short in the
development DC charge for K,
M, C, Y.

• Disconnect the high voltage cable from Terminal B of the high-voltage supply
board.
• Attach a voltmeter to the terminal.
• If there is no output from the terminal, replace the high voltage power supply.
-or-
• If there is output from the terminal, test the resistance between the high voltage
cable and the ground.
• If resistance is "0" or nearly "0", check the high-voltage harness for defects and
replace it if necessary.
• If replacing the harness does not solve the problem,
• Test the resistance between the development unit terminal and the ground. If there
is no resistance (0Ω) between the development unit and the ground, replace the
development unit.
• If there is no development PWM signal, replace the harness and/or IOB.
• Development power pack defective
• High voltage power supply defective
• High voltage power supply harness defective
• Development unit defective
• IOB harness disconnected or defective
• IOB defective
SC324Development motor error: K
SC325Development motor error: M
SC326Development motor error: C
SC327Development motor error: Y

The PLL lock signal remained HIGH
or LOW for longer than the
prescribed time for the K, M, C, or
Y, development motor.
• Development motor shaft locked, blocked
by obstruction
• Development motor defective
• DRB defective
SC336Developer set error: K
SC337Developer set error: M
SC338Developer set error: C
SC339Developer set error: Y

The value of Vcnt is set at the maximum or minimum setting when the TD sensor is
initialized.
1. Open the front door.
2. Pull out the film seal from the black, magenta, cyan, or yellow developer bottle.
3. Do the correct SP for the affected color:
• SP3801 003 to initialize the TD sensor for K.
• SP3801 004 to initialize the TD sensor for M.
• SP3801 005 to initialize the TD sensor for C.
• SP3801 006 to initialize the TD sensor for Y
SC348Toner supply motor error

2 sec. after the motor START signal
is output, a LOCK signal cannot be
detected
• Motor harness disconnected, loose, or
defective
• Toner pump overload
• Sub hopper overload
• Toner hopper motor defective
SC350Developer Fill Error: K
SC351Developer Fill Error: M
SC352Developer Fill Error: C
SC353Developer Fill Error: Y

The PCU failed to fill with developer from the developer bottle when SP3814-1 was
executed.
• Developer bottle not set correctly
• Developer in the bottle is clogged and not flowing
Note: For detailed information about how to handle problems developer filling, see
"Handling Problems with Developer Filling" under "PCU" in Section 3.
SC360TD sensor (Vt high) error: K
SC361TD sensor (Vt high) error: M
SC362TD sensor (Vt high) error: C
SC363TD sensor (Vt high) error: Y

The Vt value of the black, magenta, cyan, or yellow TD sensor exceeds 0.5V for 10
counts.
• Black, magenta, cyan, or yellow TD sensor disconnected
• Harness between TD sensor and PCU defective
• Defective TD sensor, replace the PCU
Note: The TD sensor cannot be replaced independently. The PCU must be replaced
if the TD sensor is defective.
SC364TD sensor (Vt low) error: K
SC365TD sensor (Vt low) error: M
SC366TD sensor (Vt low) error: C
SC367TD sensor (Vt low) error: Y

The Vt value of the black, magenta, cyan, or yellow TD sensor is below 0.5V for 10
counts
• TD sensor harness disconnected, loose, defective
• A drawer connector (located on the rear of a development unit) disconnected,
loose, defective
• TD sensor defective, replace the PCU
Note: The TD sensor cannot be replaced independently. The PCU must be replaced
if the TD sensor is defective
SC372TD sensor adjustment error: K
SC373TD sensor adjustment error: M
SC374TD sensor adjustment error: C
SC375TD sensor adjustment error: Y

During TD sensor initialization with SP3801, the output value of the black, magenta,
cyan, or yellow TD sensor is not within the range of 2.5±0.2V
TD harness sensor disconnected, loose or defective
Harness between TD sensor and drawer disconnected, defective
• TD sensor defective, replace the PCU
Note: The TD sensor cannot be replaced independently. The PCU must be replaced
if the TD sensor is defective.
SC396Drum motor error: K
SC397Drum motor error: M
SC398Drum motor error: C
SC399Drum motor error: Y

The motor is trying to rotate at power on or during normal operation but there is an
excessive load on the drum shaft. The motor has no traction (due to a bent cleaning
blade, for example).
• Drum motor harness loose, broken, defective
• Drum motor defective
• DTMB defective
SC400ID sensor error: Calibration

Before adjustment Vsg_reg<0.5 but
Vsg_reg could not be adjusted to the
target Vsg_reg = 4.0±0.2V during
process control.

Note: Vsg_reg is the voltage reading of the light reflected directly from the bare surface
of the ITB. The additional receptor on the color sensor is not used to read the bare
surface of the belt. For more, see Section "6. Details".
• ID sensor harness disconnected,
loose, defective
• ID sensor dirty
• ID sensor defective
• ITB unit drawer connector dirty
SC410ID sensor error: Development γ K
SC411ID sensor error: Development γ M
SC412ID sensor error: Development γ C
SC413ID sensor error: Development γ Y

Development gamma for black, magenta, cyan, or yellow is not within range (0.3
to 6.0). Process control halts when this SC is issued.
• Toner density abnormal. Refer to the image troubleshooting section in Section
4 of the Venus-C1 B132 Service Manual (Self-Check Error Codes 55 to 59,
61).
• LD sensor harness loose, broken, defective
• Potential sensor defective
• LD unit not firing
• ITB separation for CMY abnormal
• Transfer power pack defective
SC414ID sensor error: Development start voltage K
SC415ID sensor error: Development start voltage M
SC416ID sensor error: Development start voltage C
SC417ID sensor error: Development start voltage Y

The development start voltage in the development of the black, magenta, cyan, or
yellow PCU is not within the correct range (±150V)
• Toner density abnormal. Refer to the image troubleshooting section in Section
4 of the Venus-C1 B132 Service Manual (Self-Check Error Codes 55 to 59,
61).
• Potential sensor defective
• LD unit not firing
• ITB separation for CMY abnormal
• Transfer power pack defective
SC418LED error during Vsg adjustment

PWM value: Ifsg>3000
This means the current to the LED of the ID
sensor is abnormal.
• ID sensor dirty
• ID sensor defective
SC420Potential sensor error: Vd Adjustment K
SC421Potential sensor error: Vd Adjustment M
SC422Potential sensor error: Vd Adjustment C
SC423Potential sensor error: Vd Adjustment Y

The development potential of the drum before exposure (Vd) cannot be adjusted to
within ±8 V of the target voltage (-900V).
• Drum potential sensor harness, connector is loose, broken, defective
• Drum potential sensor dirty
• Drum potential sensor defective
• Drum connector, harness loose, broken, defective
• Development power pack defective
• VBCU defective
SC424Potential sensor error 5: Vl adjustment K
SC425Potential sensor error 6: Vl adjustment M
SC426Potential sensor error 7: Vl adjustment C
SC427Potential sensor error 8: Vl adjustment Y

Vpl could not be adjusted to within ±5V of the target Vpl after exposure of the ID
sensor patterns.
• Drum worn
• LD unit dirty
• Poor drum ground connection
SC432Potential sensor error 1: Vr K
SC433Potential sensor error 2: Vr M
SC434Potential sensor error 3: Vr C
SC435Potential sensor error 4: Vr Y

Vr > 200V. The residual voltage (Vr), the amount of voltage that remains on
the surface of the drum after the QL fires is greater than 200V.
• Potential sensor dirty
• Potential sensor defective
• Charge roller defective
• Charge power pack defective
• OPC defective
SC436Potential sensor error: Vd K
SC437Potential sensor error: Vd M
SC438Potential sensor error: Vd C
SC439Potential sensor error: Vd Y

The VdHome reading, the first step of the process control self-check, detected
that the development potential of the unexposed areas of the drum are not
within the prescribed range (-500 to -800)
• Potential sensor dirty
• Potential sensor defective
• Charge roller defective
• Charge power pack defective
• OPC defective
SC440Image transfer power pack error: K
SC441Image transfer power pack error: M
SC442Image transfer power pack error: C
SC443Image transfer power pack error: Y

An interrupt checks the status of the power pack every 10 ms. This SC is issued if the
VBCU detects a short in the power pack for K, M, C, or Y.
• Transfer belt damaged, insulation damaged
• Insulation on high voltage cable damaged
• Another hot point inside the machine has damaged insulation
• Insulation around high-voltage power supply damaged
SC445Image transfer motor error

The control board of the ITB motor
belt generated signals that indicate
there is problem with the image
transfer belt motor
• ITB motor defective
• ITB control board defective
• ITB overloaded
• Encoder strip on the edge of the ITB
damaged.
SC446ITB lift motor error

The state of the ITB lift sensor does
not change its state (switching from
off to on or vice versa), even after
the ITB lift motor starts rotating
• ITB lift sensor dirty, disconnected,
defective
• ITB lift motor disconnected, defective
• ITB sensor defective
• ITB lift motor defective
SC447Image transfer roller position error

The machine checks for the presence of
the K STC and the checks the status of
the K image transfer roller lift sensor
after the door is closed.
• Transfer belt release lever down
• Lift sensor connector loose, broken,
dirty
• Lift sensor defective
SC450Transfer power pack output error

An interrupt checks the status of the
power pack every 2 ms. This SC is
issued if the VBCU detects a short in
the power pack 250 times at T2
within 500 ms.
• Damaged insulation on the high-voltage
supply cable
• Damaged insulation around the highvoltage
power supply.
• Check SIOB harness connections
• SIOB defective
SC452PTR lift mechanism error

The PTR was not detected at the
home position within 2 sec. after the
PTR lift motor turned on.
• PTR HP sensor dirty, disconnected,
defective
• PTR lift motor disconnected, defective
SC455PTR motor error

The lock signal from the paper
transfer motor was not detected
within 1 sec. after the motor
switched on.
• Motor disconnected
• PTR shaft locked, needs cleaning, blocked
by obstruction
• Drive shaft of the ITB locked and
overloaded, needs cleaning, or blocked
by obstruction
• DRB disconnected, defective
SC460Separation power pack output error

This SC is issued if the VBCU detects
a short in the transfer power pack
• Damaged insulation on the high-voltage
supply cable (replace cable)
• Damaged insulation around the transfer
power pack
SC465Image Transfer Roller End: K
SC466Image Transfer Roller End: M
SC467Image Transfer Roller End: C
SC468Image Transfer Roller End: Y

The machine detected an abnormal
reading of the resistance of the
transfer roller because it is near the
end of its service life.
• Check the connections between the
transfer roller power pack the roller
• Replace image transfer roller
• Image transfer power pack defective
SC472ITB Bias Roller End

The machine detected an abnormal
reading of the resistance of the ITB
bias roller because it is near the end
of its service life.
• Check the connections between the
transfer power pack
• Replace image transfer roller
• Transfer power pack defective
SC480Drum cleaning motor error: K
SC481Drum cleaning motor error: M
SC482Drum cleaning motor error: C
SC483Drum cleaning motor error: Y

The drum cleaning motor failed to switch
on (motor lock), or failed to reach the
required speed within the prescribed
time.
• Motor block by physical obstruction
• Motor harness loose, broken,
defective
• Motor defective
SC484Used toner bottle full

The toner full sensor has detected
that the used toner bottle is full.
• Remove the used toner bottle
• Empty the used toner bottle and reinstall it
SC485Used toner bottle motor error

The lock signal of the used toner
bottle motor remains HIGH for
more than 600 ms
• Used toner bottle harness loose, broken,
defective
• Used toner bottle motor defective
SC487Used toner bottle set error

The set sensor of the used toner
bottle remains LOW for more than
500 ms. (The sensor goes HIGH
when the bottle is installed
correctly.)
• Used toner bottle not installed
• Remove used toner bottle and reinstall
correctly
SC488Used toner transport lock

Used toner cannot be transported
to the used toner bottle
• Blockage in the line to the used toner bottle
SC490MUSIC sensor error

One or more of the MUSIC sensors
is not functioning normally
• MUSIC sensor harness loose, broken,
defective
• Sensor defective
SC495ITB encoder sensor error

The ITB encoder sensor that
reads the encoded strip on the
ITB is not functioning properly
• Sensor dirty
• Sensor harness loose, broken, defective
• Sensor out of position because installed
incorrectly
• ITB installed incorrectly
SC496MUSIC sensor error

The MUSIC sensor detected an abnormal pattern on the ITB because:
• ADC exceeded upper or lower limit.
• The pattern used to calculate the amount of skew is abnormal.
• The reading of the pattern exceeded the length of time the LED projected light.
• LED light could not be adjusted correctly.
• ITB installed incorrectly
• Inspect ITB belt for damage, replace
• MUSIC pattern abnormal; do a forced process control (SP3821) and check the
result.
• MUSIC sensor defective or disconnected
SC497Temperature and humidity sensor error: M PCU

The thermistor output of the
temperature and humidity sensor
above the M PCU was not within the
prescribed range (0.5V to 4.2V)
• Temperature and humidity sensor harness
disconnected, loose, defective
• Temperature and humidity sensor
defective
SC498Temperature and humidity sensor error: Toner Bottle

The thermistor output of the
temperature and humidity sensor
below the used toner bottle was not
within the prescribed range (0.5V
to 4.2V)
• Temperature and humidity sensor harness
disconnected, loose, defective
• Temperature and humidity sensor
defective
SC499ITB encoder sensor error

The ITB sensor that reads the
encoded film strip on the edge of the
image transfer belt is sending is
operating correctly
• ITB encoder sensor dirty
• Sensor harness disconnected or
damaged
• Encoded scale on the edge of the ITB is
damaged or dirty
• ITB installed incorrectly
SC501Tray 1 (tandem tray) feed error (Japan Only)

The tray 1 lift sensor does not switch
on 10 s after the tray lift motor
switches on and starts lifting the
bottom plate.
When the tray lowers, the tray lift
sensor does not go off within 1.5
sec.
The lower limit sensor of the tandem
tray does not detect the lower limit
within 10 sec
• Tray lift motor harness disconnected,
loose, defective
• Paper or other obstacle trapped between
tray and motor
• Tray lift sensor disconnected, damaged
• Lower limit sensor disconnected,
damaged
• Pick-up solenoid disconnected, blocked
by an obstacle
SC502Tray 2 (paper cassette) feed error (Japan Only)

The lift sensor is not activated within 10
seconds after the tray lift motor starts lifting
the bottom plate.
When the tray lowers, the tray lift sensor
does not go off within 1.5 sec.
The lower limit sensor of the tandem tray
does not detect the lower limit within 10
sec.
• Tray lift motor defective or
disconnected
• Paper or other obstacle trapped
between tray and motor
• Pick-up solenoid disconnected or
blocked by an obstacle
SC503Tray 1 feed error

The lift sensor is not activated within 10
seconds after the tray lift motor starts
lifting the bottom plate.
When the tray lowers, the tray lift sensor
does not go off within 1.5 sec.
• Tray lift motor defective or
disconnected
• Paper or other obstacle trapped
between tray and motor
• Pick-up solenoid disconnected or
blocked by an obstacle
SC504Tray 2 feed error

The lift sensor is not activated within 10
seconds after the tray lift motor starts
lifting the bottom plate.
When the tray lowers, the tray lift sensor
does not go off within 1.5 sec.
• Tray lift motor defective or
disconnected
• Paper or other obstacle trapped
between tray and motor
• Pick-up solenoid disconnected or
blocked by an obstacle
SC505Tandem tray rear fence motor error

The return sensor does not switch on
within 10 sec. after the rear fence
motor switches on.
The HP sensor does not switch on
10 sec. after the rear fence motor
switches on.
The HP sensor and return sensor
switch on at the same time.
• Rear fence motor defective or poor
connection
• Paper or other obstacle interfering with
operation of the sensors
• Paper or other obstacle trapped between
tray and motor
• Motor mechanical overload due to
obstruction
• Return sensor or HP sensor defective or
dirty
SC510LCT tray error: B473/D350

When the bottom plate is lifted, the upper limit sensor does not come on for 30 sec.
When the bottom plate is lowered, the lower limit sensor does not come on for 30
sec.
After lift begins, the upper limit sensor does not switch on before the pick-up solenoid
switches on.
The paper end sensor switches on during lift and the upper limit sensor does not switch
on for 2.5 s, and a message prompts user to reset paper.
• Tray lift motor harness, disconnected, loose, or defective
• Tray lift motor defective
• Lift sensor defective or disconnected
• Pick-up solenoid defective or disconnected
• Paper end sensor defective
SC515Duplex jogger motor error 1

When the jogger fence moves to the
home position, the jogger fence HP
sensor does not switch on even after
the jogger motor has moved the
jogger fence 153.5 mm.
• Jogger fence motor defective or poor
connection
• Paper or other obstacle interfering with
operation of the sensors or motor
• Return sensor or HP sensor defective, dirty,
or disconnected
• Paper or other obstacle has jammed
mechanism
• HP sensor connector disconnected or
defective
• HP sensor defective
SC516Duplex jogger motor error 2

When the jogger fence moves from
the home position, the jogger fence
HP sensor does not turn off even if
the jogger motor has moved the
jogger fence 153.5 mm.
• Jogger fence motor defective or poor
connection
• Paper or other obstacle interfering with
operation of the sensors or motor
• Return sensor or HP sensor defective, dirty,
or disconnected
• Paper or other obstacle has jammed
mechanism
• HP sensor connector disconnected or
defective
• HP sensor defective
SC517LCIT air assist front fan error

The front air assist fan is not
functioning properly.
• Fan harness disconnected or damaged
• Fan blocked by an obstruction
• Fan damaged, defective
SC518LCIT air assist rear fan error

The rear air assist fan is not
functioning properly.
• Fan harness disconnected or damaged
• Fan blocked by an obstruction
• Fan damaged, defective
SC530Fusing cooling fan error

The VBCU did not receive the lock
signal 5 seconds after the fusing unit
fan switches on.
• Fan harness disconnected or damaged
• Fan blocked by an obstruction
• Fan damaged
SC531Fusing Fan Error: Front

The lock signal remained HIGH for
5 sec. while the fan at the front of
the fusing unit near the heat
dissipation fins was operating.
• Fan harness disconnected or damaged
• Fan blocked by an obstruction
• Fan damaged
SC532Controller fan error

The lock signal remained HIGH
for 5 sec. while the fan that cools
the printed circuit boards was
operating.
• Fan harness disconnected or damaged
• Fan blocked by an obstruction
• Fan damaged
SC533Fusing unit suction fan error

The lock signal remained HIGH
for 5 sec. while the fan that
draws air out of the fusing unit
was operating.
• Fan harness disconnected or damaged
• Fan blocked by an obstruction
• Fan damaged
SC534Duplex unit fan error

The lock signal remained HIGH
for 5 sec. while the fan that
draws air out of the duplex unit
was operating.
• Fan harness disconnected or damaged
• Fan blocked by an obstruction
• Fan damaged
SC535Development Intake Fan Error

The lock signal remained HIGH for
5 sec. while the fan in the Y
development unit was operating.
• Fan harness disconnected or damaged
• Fan blocked by an obstruction
• Fan damaged
SC536Development Intake Fan Error: Y
SC537Development Intake Fan Error: C
SC538Development Intake Fan Error: M
SC539Development Intake Fan Error: K

The lock signal remained HIGH for
5 sec. while the fan in the
development unit was operating.
• Fan harness disconnected or damaged
• Fan blocked by an obstruction
• Fan damaged
SC540Fusing/exit motor error

Motor operation was detected
abnormal at power on.
• Check inside the fusing unit for any
obstructions
• Motor harness loose, broken, defective
• Motor or its driver board defective
SC541Heating roller thermistor (center) error 1

The "floating" (non-contact)
thermistor at the center of the
heating roller is not operating
correction.
• Thermistor harness connection loose,
disconnected, defective
• Thermistor installed incorrectly
• Thermistor defective
SC543Heating roller thermistor (center) error 2

The thermistor at the center of the
heating roller detected an
abnormally high temperature (over
250°C)
• Do SP5810 to cancel the SC fusing code.
• TRIAC short, AC drive board defective
• VBCU defective
SC544Heating roller thermistor (center) error 3

The thermistor detected a
temperature over 260°C..
• Do SP5810 to cancel the SC fusing code.
• TRIAC short, AC drive board defective
• VBCU defective
SC545Lamp remains on

After hot roller reaches warm-up
temperature, the center fusing
lamps in the heating roller remained
on at full capacity after reaching the
warm-up temperature while the hot
roller was not rotating.
• Do SP5810 to cancel the SC fusing code.
• Heating roller thermistor damaged, or out
of position
• Fusing lamp disconnected, broken
SC546Heating roller thermistor error (side)

The temperature measured by the
heating roller thermistor does not
reach 0°C after 50 sec. and
remains over this temperature for
10 readings.
• Loose connection of the heating roller
thermistor
• Defective heating roller thermistor
SC547Zero cross error

When the main switch is turned on, the machine checks how many zero-cross signals
are generated within 500 ms. This SC code is issued if the number of zero-cross signals
detected is not within specification.
Note: Zero cross signals, generated from an ac power supply, are used to generate
a trigger pulses to control the applied power accurately.
• Do SP5810 to cancel the SC fusing code.
• Electrical noise on the power supply line
• Fusing relay damaged, replace the AC drive board.
SC549Heating roller thermistor (center): software error

The thermistor detected a
temperature over 250°C 10 times
within 1 sec.
• Do SP5810 to cancel the SC fusing code.
• TRIAC short, AC drive board defective
• VBCU defective
SC550Heating roller thermistor 3 (side): hardware error

The thermistor detected a
temperature over 260°C..
• Do SP5810 to cancel the SC fusing code.
• TRIAC short, AC drive board defective
• VBCU defective
SC551Pressure roller thermistor error 1

The temperature measured by the
pressure roller thermistor did not
reach 0°C after 10 attempts.
• Do SP5810 to cancel the SC fusing code.
• Loose connection of the pressure roller
thermistor
• Thermistor positioned incorrectly
• Defective pressure roller thermistor
SC552Pressure roller thermistor error 2

After the main switch is turned on or the cover is closed, the heating roller temperature
did not reach the ready temperature (45°C) within 80 sec. after the fusing lamp
switches on.
-or-
If the fusing unit did not reach the reload temperature after 350 sec.
• Pressure roller thermistor harness loose, disconnected, defective
• Pressure roller thermistor defective
SC553Pressure roller thermistor (software) error

The thermistor detected a
temperature over 220°C 12 times
within 1 sec.
• Do SP5810 to cancel the SC fusing code.
• TRIAC short, AC drive board defective
• VBCU defective
SC554Pressure roller thermistor (hardware) error

The thermistor detected a
temperature over 230°C.
• Do SP5810 to cancel the SC fusing code
• TRIAC short, AC drive board defective
• VBCU defective
SC555Pressure roller fusing lamp remains on

After hot roller reaches warm-up
temperature, the pressure roller
fusing lamp remained for 300 sec.
while the hot roller is not rotating.
• Do SP5810 to cancel the SC fusing code.
• Thermistor damaged, or out of position
• Fusing lamp disconnected, broken
SC556Heating roller fusing lamp error

After hot roller reaches warmup
temperature, the heating roller fusing
lamp (ends) remains for 10 sec. while the
hot roller is not rotating.
• Thermistor damaged, or out of
position
• Fusing lamp disconnected, broken
SC557Zero Cross Over Error

At power on the fusing relay was
detected as defective.
• Replace the AC drive board.
SC559Three Successive Paper Jams in Fusing Unit

This SC only occurs if SP1159 is on, and a jam occurred in the fusing unit for three
consecutive sheets of paper. With SP1159 set to "1" the machine operation can be
restored only by the service technician.

The paper cooling job time sensor
detected paper late for 3 counts.
• Remove the paper that is jammed in the
fusing unit.
• Make sure that the fusing unit is clean and
has no obstacles in the paper feed path.
SC561Heating roller non-contact thermistor error 1

The temperature measured by the heating roller
thermistor (non-contact) on the end of the
heating roller did not reach the prescribed
warm-up temperature within 1 sec.
• Loose, broken, damaged
connector
• Defective thermistor
SC562Heating roller non-contact thermistor error 2

After the main switch is turned on or the cover is closed, the heating roller temperature
does not reach the ready temperature within 100 sec. after the heater switches on.
-or-
The heating roller did not reach the ready temperature within 150 sec.
• Note: Thermistor 2 stops monitoring the temperature when Thermistor 1 detects
the ready temperature.
• Do SP5810 to cancel the SC fusing code
• Defective hot roller thermistor
• Heating roller disconnected, defective
SC563Heating roller non-contact thermistor error 3

The thermistor 2 (of the heating
roller) detected a temperature over
250°C 10 times within 1 sec.
• Do SP5810 to cancel the SC fusing code.
• TRIAC short, AC drive board defective
• VBCU defective
SC564Heating roller non-contact thermistor error 3

The thermistor detected a
temperature over 260°C.
• Do SP5810 to cancel the SC fusing code.
• TRIAC short, AC drive board defective
• VBCU defective
SC565Heating roller fusing lamp on error

After fusing belt reached warm-up
temperature, the heating roller
fusing lamp remained on for 20 sec.
while the hot roller was not rotating.
• Do SP5810 to cancel the SC fusing code.
• Thermistor damaged, or out of position
• Fusing lamp disconnected, broken
SC568Pressure roller lift error 1

Even after the leading edge of the
paper reached the fusing exit
sensor, the pressure roller lift motor
did not raise the pressure roller.
• Pressure roller lift sensor connection loose,
broken, damaged
• Clean the pressure roller lift sensor
• Pressure roller lift harness loose, broken,
damage
• Pressure roller lift motor blocked by an
obstruction
• Pressure roller lift motor defective
SC569Pressure roller lift error 2

Pressure roller lift motor not
operating correctly. (No
signal to indicate completion
of operation.)
• Pressure roller lift sensor connection loose,
broken, damaged
• Clean the pressure roller lift sensor
• Pressure roller lift harness loose, broken, damage
• Pressure roller lift motor blocked by an obstruction
• Pressure roller lift motor defective
SC570Development intake fan error

Fan motor not operating correctly.
• Fan harness loose, broken, defective
• Fan overload due to physical obstruction
• Fan motor defective
SC571Ozone exhaust fan (FC) error

The fan of the middle ozone filter
box not operating correctly.
• Fan harness loose, broken, defective
• Fan overload due to physical obstruction
• Fan motor defective
SC572Ozone exhaust fan (K) error

The fan of the lower ozone filter box
not operating correctly.
• Fan harness loose, broken, defective
• Fan overload due to physical obstruction
• Fan motor defective
SC573Ozone intake fan error

The ozone filter intake fan not
operating correctly.
• Fan harness loose, broken, defective
• Fan overload due to physical obstruction
• Fan motor defective
SC574Y thermistor error

The thermistor near the Y PCU has
short circuited or otherwise not
operating correctly.
• Harness loose, broken, defective
• Thermistor defective
SC599Tray 1 lift motor error

An error was detected in the
operation of the lift motor for Tray 1
(tandem tray).
• Motor harness loose, broken, defective
• Motor overload due to an obstruction
• Motor defective
SC620ARDF communication error

A BREAK signal occurs after the
machine detects the ARDF, or a
communication timeout occurs.
• ARDF disconnected
• VBCU board harness disconnected,
defective
• VBCU board defective
• Spurious noise from the power supply line
• ARDF defective
SC621Mailbox-to-Finisher communication error

Communication between the
mailbox and finisher is interrupted.
An ACK/NCK signal was not
received within 100 ms after a data
frame is sent and 3 retries failed.
• Connection cable between mailbox and
finisher disconnected, defective
• Finisher main board defective
• VBCU defective
• PSU defective
SC622PFB communication error

Communication between the VBCU
and PFB was interrupted.
(Communication status is monitored at
30 ms intervals.)
• Connection cable between the VBCU
and PFB is disconnected, defective
• VBCU defective
• PFB defective
SC624Mailbox-to-copier communication error

Communication between the
mailbox and copier is interrupted.
An ACK/NCK signal was not
received within 100 ms after a data
frame is sent and 3 retries failed.
• Mailbox cable disconnected, defective
• Mailbox main board defective
• VBCU defective
• PSU defective
SC625VBCU-DTMB (DMC1) communication error

Communication between the VBCU
and DMC (main) was interrupted.
An ACK/NAK signal was not
received within 100 ms after a data
frame was sent and three retries
failed.
• Check the DTMB harness connections at
the DTMB and VBCU
• DTMB defective
• PSU defective
• VBCU defective
• 5V power supply defective
SC626VBCU-DTMB (DMC2) communication error

Communication between the VBCU
and DMC (sub) was interrupted. An
ACK/NAK signal was not received
within 100 ms after a data frame
was sent and three retries failed.
• Check the DTMB harness connections at
the DTMB and VBCU
• DTMB defective
• VBCU defective
• PSU defective
SC627VBCU-DTMB (TMC) communication error

Communication between the VBCU
and TMC was interrupted. An
ACK/NAK signal was not received
within 100 ms after a data frame
was sent and three retries failed.
• DTMB harness loose, broken, defective
• DTMB defective
• VBCU defective
• PSU defectiv
SC687Memory address command error

The VBCU does not receive a
memory address command from
the controller 120 seconds after
paper is in the position for
registration.
• Turn the machine power off/on
• Check the controller board connections
• Controller defective
SC701ARDF original pickup operation error

Even though the pickup motor is rotating clock-wise, the pickup roller home position
sensor cannot detect the position of the pickup roller.
• Pickup roller HP sensor harness loose, disconnected, defective
• Pickup roller HP sensor defective
• Pickup motor harness loose, disconnected, defective
• Pickup motor defective
• ARDF control board defective
SC705ARDF bottom plate lift motor

The bottom plate HP sensor did not detect the home position of the bottom plate after
the bottom plate lift motor switches on and lowers the bottom plate.
The bottom plate position sensor does not detect the position of the plate after the lift
motor switches on and raises the bottom plate.
• ARDF feed motor disconnected, defective
• Bottom plate HP sensor disconnected, defective
• ARDF main board defective
SC720Finisher lower transport motor error

No encoder pulse signal is detected
for the transport motor within the
prescribed time.
The 1st failure causes an original
jam message, and the 2nd failure
causes this SC code.
• Lower transport motor disconnected,
defective
• Finisher connection to transport motor
loose, defective
• Lower transport motor defective
• Finisher main board defective
SC721Finisher jogger motor error (D373/D374, B830)

The jogger fences move out of the
home position but the HP sensor
output does not change within the
specified number of pulses. The 1st
failure causes an original jam
message, and the 2nd failure
causes this SC code.
• Jogger HP sensor disconnected, defective
• Jogger motor disconnected, defective
• Jogger motor overloaded due to
obstruction
• Finisher main board and jogger motor
connection loose, defective
• Finisher main board defective
SC723Finisher feed-out motor (B830)

The stack feed-out belt HP sensor
does not activate within the
specified time after the stack feedout
belt motor turns on. The 1st
detection failure causes a jam error,
and the 2nd failure causes this SC
code.
• Stack feed-out HP sensor disconnected,
defective
• Feed-out motor disconnected, defective
• Finisher main board connection to feed out
motor disconnected, defective
• Motor overload due to obstruction
SC724Finisher stapler hammer motor error (B830)

Stapling does not finish within the
prescribed time after the staple
hammer motor turns on. The 1st
detection failure causes a jam error,
and the 2nd failure causes this SC
code.
• Stapler hammer motor overloaded due to
obstruction, jammed staple, number of
sheets exceeds limit for stapling
• Stapler hammer motor disconnected,
defective
• Staple hammer motor HP sensor
disconnected, defective
SC725Finisher exit guide plate motor error (D373/D374, B830, B660)

After moving away from the guide
plate position sensor, the exit guide
is not detected at the home position
within the prescribed time. The 1st
detection failure causes a jam error,
and the 2nd failure causes this SC
code.
• Guide plate motor disconnected,
defective
• Guide plate motor overloaded due to
obstruction
• Guide plate position sensor disconnected,
defective
SC726Shift jogger motor 1 error (D373/D374, B830)

The sides fences do not retract
within the prescribed time after the
shift jogger motor switches on. The
1st detection failure causes a jam
error, and the 2nd failure causes
this SC code.
• Shift jogger motor disconnected, defective
• Shift jogger motor overloaded due to
obstruction
• Shift jogger HP sensor disconnected,
defective
SC727Shift jogger motor 2 error (D373/D374)

The side fences do not retract within
the prescribed time after the shift
jogger motor switches on. The 1st
detection failure causes a jam error,
and the 2nd failure causes this SC
code.
• Motor harness disconnected, loose,
defective
• Motor defective
• Motor overload
• HP defective
SC728Shift jogger retraction motor error (D373/D374)

The side fences do not retract within the
prescribed time after the retraction motor
switches on. The 1st detection failure
causes a jam error, and the 2nd failure
causes this SC code.
• Motor harness disconnected,
loose, defective
• Motor defective
• Motor overload
• HP defective
SC730Finisher Tray 1 shift motor error (B830)

The shift roller HP sensor of the upper tray
does not activate within the prescribed
time after the shift tray starts to move
toward or away from the home position.
The 1st detection failure causes a jam
error, and the 2nd failure causes this SC
code.
• Shift tray HP sensor of the upper tray
disconnected, defective
• Shift tray motor of the upper tray is
disconnected, defective
• Shift tray motor of the upper tray
overloaded due to obstruction
SC731Upper Transport Motor Error (Proof Tray): B830

No encoder pulse signal is detected
for the upper transport motor within
600 ms. The 1st failure causes this
SC code.
• Upper transport motor disconnected,
defective
• Finisher connection to upper transport
motor loose, defective
• Upper transport motor blocked by an
obstruction
• Upper transport motor defective
• Finisher main board defective
SC732Shift Tray Exit Motor: 3K Finisher B830

The shift tray exit motor is not
operating.
• Motor harness loose, broken, defective
• Motor is blocked by an obstruction
• Motor defective
• Finisher main control board defective
SC733Stapler Exit Motor: B830

The stapler exit motor is not
operating.
• Motor harness loose, broken, defective
• Motor is blocked by an obstruction
• Motor defective
• Finisher main control board defective
SC734Upper Tray Junction Gate Motor: 3K Finisher B830

The upper tray junction gate HP
sensor did not detect the gate at the
home position within 200 ms after
two attempts.
-or-
The HP sensor twice detected the
gate at the home position for more
than 200 ms after it was supposed
to open.
• Junction gate did not arrive at the home
position within the specified time
• Junction gate did not leave the home
position within the specified time
SC735Staple Junction Gate Motor Error: B830

The staple tray junction gate HP
sensor did not detect the gate at the
home position within 200 ms after
two attempts.
-or-
The HP sensor twice detected the
gate at the home position for more
than 200 ms after it was supposed
to open.
• Junction gate did not arrive at the home
position within the specified time
• Junction gate did not leave the home
position within the specified time
SC736Pre-Stack Junction Gate Motor Error: 3K Finisher B830

The pre-stack junction gate HP
sensor did not detect the gate at the
home position for within 200 ms
after two attempts.
-or-
The HP sensor twice detected the
gate at the home position for more
than 200 ms after it was supposed
to open
• Junction gate did not arrive at the home
position within the specified time
• Junction gate did not leave the home
position within the specified time
SC737Pre-Stack Transport Motor Error: B830

The pre-stack transport
motor is not operating.
• Motor harness loose, broken, defective
• Motor is blocked by an obstruction
• Motor defective
• Finisher main control board defective
SC738Pre-Stack Junction Gate Release Motor Error: B830

The pre-stack junction gate release
HP sensor did not detect the gate at
the home position within 200 ms after
two attempts.
-or-
The HP sensor twice detected the
gate at the home position for more
than 200 ms after it was supposed
open.
• Junction gate did not arrive at the home
position within the specified time
• Junction gate did not leave the home
position within the specified time
SC740Finisher corner stapler motor error (B830)

The stapler motor does not switch off
within the prescribed time after
operating. The 1st detection failure
causes a jam error, and the 2nd failure
causes this SC code.
• Staple jam
• Number of sheets in the stack
exceeds the limit for stapling
• Stapler motor disconnected,
defective
SC741Finisher corner stapler rotation motor error

The stapler does not return to its home
position within the specified time after
stapling. The 1st detection failure causes a
jam error, and the 2nd failure causes this SC
code.
• Stapler rotation motor
disconnected, defective
• Stapler rotation motor
overloaded due to obstruction
• Stapler rotation HP sensor
disconnected, defective
SC742Finisher stapler movement motor error

The stapler HP sensor is not activated
within the specified time after the stapler
motor turned on. The 1st detection failure
causes a jam error, and the 2nd failure
causes this SC code.
• Stapler movement motor
disconnected, defective
• Stapler movement motor overloaded
due to obstruction
• Stapler HP sensor disconnected,
defective
SC743Booklet stapler motor error 1

The front stapler unit saddle-stitch motor does
not start operation within the specified time. The
1st detection failure causes a jam error, and the
2nd failure causes this SC code.
• Front motor disconnected,
defective
• Front motor overloaded due to
obstruction
SC744Booklet stapler motor error 2

The rear stapler unit saddle-stitch motor does
not start operation within the specified time.
The 1st detection failure causes a jam error,
and the 2nd failure causes this SC code.
• Rear motor disconnected,
defective
• Rear motor overloaded due to
obstruction
SC745Feed-Out Belt Motor Error (D373/B830)

The stack feed-out belt HP sensor does not activate within the specified time after the
stack feed-out belt motor turns on. The 1st detection failure causes a jam error, and
the 2nd failure causes this SC code.
If the motor is operating
1. Stack feed-out HP sensor harness loose, broken, defective
2. Stack feed-out HP sensor defective
If the motor is not operating:
1. Feed-out motor blocked by an obstruction
2. Feed-out motor harness loose, broken, defective
3. Feed-out motor defective
4. Booklet finisher main board defective
SC746Stack Plate Motor Error 1: Front Motor (B830)

The stack plate HP sensor (front) does not activate within 500 ms after the motor turns
on. The 1st detection failure causes a jam error, and the 2nd failure causes this SC
code.
If the motor is operating
1. Front stack plate HP sensor harness loose, broken, defective
2. Front stack plate HP sensor defective
If the motor is not operating:
1. Motor blocked by an obstruction
2. Motor harness loose, broken, defective
3. Motor defective
4. Booklet finisher main board defective
SC747Stack Plate Motor Error 2: Center Motor (B830)

The stack plate HP sensor (center) does not activate within 500 ms after the motor
turns on. The 1st detection failure causes a jam error, and the 2nd failure causes this
SC code.
If the motor is operating
1. Center stack plate HP sensor harness loose, broken, defective
2. Center stack plate HP sensor defective
If the motor is not operating:
1. Motor blocked by an obstruction
2. Motor harness loose, broken, defective
3. Motor defective
4. Booklet finisher main board defective
SC748Stack Plate Motor Error 3: Rear Motor (B830)

The stack plate HP sensor (rear) does not activate within 500 ms after the motor turns
on. The 1st detection failure causes a jam error, and the 2nd failure causes this SC
code.
If the motor is operating
1. Rear stack plate HP sensor harness loose, broken, defective
2. Rear stack plate HP sensor defective
If the motor is not operating:
1. Motor blocked by an obstruction
2. Motor harness loose, broken, defective
3. Motor defective
4. Booklet finisher main board defective
SC750Finisher tray 1 (upper tray lift) motor error

The upper tray paper height sensor
does not change its status with the
specified time after the tray raises or
lowers. The 1st detection failure causes
a jam error, and the 2nd failure causes
this SC code.
• Tray lift motor disconnected, defective
• Upper tray paper height sensor
disconnected, defective
• Finisher main board connection to
motor loose
• Finisher main board defective
SC753Stacking Roller Motor Error (B830)

The return drive HP sensor did not detect the stacking roller at the HP sensor within 1
sec.
-or-
The stacking roller did not leave the home position at the specified time.
If the motor is operating
1. Return drive HP sensor harness loose, broken, defective
2. Return drive HP sensor defective
If the motor is not operating:
1. Motor blocked by an obstruction
2. Motor harness loose, broken, defective
3. Motor defective
4. Finisher main board defective
SC754Stacking Roller Drag Motor Error (B830)

The stacking roller drag motor did
not turn on.
• Motor harness loose, broken, defective
• Motor defective
• Finisher control board defective
SC755Shift Motor Error: 3K Finisher (B830)

The shift tray half-turn sensors:
Failed twice to detect the shift tray at the home position at the specified time.
-or-
Failed twice to detect that the shift tray had left the home position.
If the motor is operating
1. Half-turn sensor 1, 2 harnesses loose, broken, defective
2. One of the half-turn sensors defective
If the motor is not operating:
1. Motor blocked by an obstruction
2. Motor harness loose, broken, defective
3. Motor defective
4. Finisher main board defective
SC760Finisher punch motor error (B830)

The punch HP sensor is not
activated within the specified time
after the punch motor turned on. The
1st detection failure causes a jam
error, and the 2nd failure causes
this SC code.
• Punch HP sensor disconnected, defective
• Punch motor disconnected, defective
• Punch motor overload due to obstruction
SC761Finisher folder plate motor error (D373)

The folder plate moves but is not
detected at the home position within
the specified time. The 1st detection
failure causes a jam error, and the
2nd failure causes this SC code.
Folder plate HP sensor disconnected, defective
Folder plate motor disconnected, defective
Folder plate motor overloaded due to
obstruction.
SC763Punch movement motor error

Occurs during operation of the punch unit.
The 1st detection failure causes a jam
error, and the 2nd failure causes this SC
code.
Motor harness disconnected,
loose, defective
Motor defective
SC764Paper position sensor slide motor error

Occurs during operation of the punch unit.
The 1st detection failure causes a jam
error, and the 2nd failure causes this SC
code.
Motor harness disconnected,
loose, defective
Motor defective
SC765Fold Unit Bottom Fence Lift Motor Error (D373)

The fold unit bottom fence
did not return to the home
position within the
specified time.
• Fold bottom fence mechanism overloaded due to
an obstruction
• Fold bottom fence HP sensor connector loose,
broken, defective
• Fold bottom fence HP sensor defective
• Fold bottom fence lift motor connector loose,
broken, defective
• Fold bottom fence lift motor defective
• Main control board defective
SC766Clamp Roller Retraction Motor (D373)

The clamp roller did not return
to the home position within the
specified time.
• Clamp roller mechanism overloaded due to an
obstruction
• Clamp roller HP sensor connector loose,
broken, defective
• Clamp roller HP sensor defective
• Clamp roller retraction motor connector loose,
broken, defective
• Clamp roller retraction motor defective
• Main control board defective
SC767Stack Junction Gate Motor (D373)

The stack junction gate did not
return to the home position
within the specified time.
• Stack junction mechanism overloaded due to an
obstruction
• Stack junction gate HP sensor connector loose,
broken, defective
• Stack junction gate HP sensor defective
• Stack junction gate motor connector loose,
broken, defective
• Stack junction gate motor defective
• Main control board defective
SC770Cover Interposer Lift Motor 1 Error

In the first tray:
• The upper limit sensor did not detect the bottom plate within the specified time
after the lift motor switched on to lift the bottom plate.
• The lower limit sensor did not direct the bottom plate within the specified time
after the lift motor switched on to lower the bottom plate.
Note: In both cases, 1 error count indicates a jam, 2 error counts cause this SC code.
• Lift motor, upper limit sensor, lower limit sensor harnesses, connectors loose,
broken, defective
• Lift motor defective
• Upper limit sensor defective
• Lower limit sensor defective
SC771Cover Interposer Lift Motor 2 Error

In the second tray:
• The upper limit sensor did not detect the bottom plate within the specified time
after the lift motor switched on to lift the bottom plate.
• The lower limit sensor did not direct the bottom plate within the specified time
after the lift motor switched on to lower the bottom plate.
Note: In both cases, 1 error count indicates a jam, 2 error counts cause this SC code.
• Lift motor, upper limit sensor, lower limit sensor harnesses, connectors loose,
broken, defective
• Lift motor defective
• Upper limit sensor defective
• Lower limit sensor defective
SC772Cover Interposer Pickup Motor 1 Error

In the first tray:
• While the pick-up roller motor was on, the pick-up roller HP sensor did not detect
the pick-up roller at the home position within the specified number of pulses.
• While the pick-up roller motor was on, the pick-up roller HP sensor did not detect
the pick-up roller at the home position above the specified number of pulses.
Note: In both cases, 1 error count indicates a jam, 2 error counts cause this SC code.
• The pick-up motor, pick-up roller HP sensor harnesses, connectors were loose,
broken, defective
• Pick-up motor overload due to an obstruction
• Pick-up motor defective
• Pick-up roller HP sensor defective
SC773Cover Interposer Pickup Motor 2 Error

In the second tray:
• While the pick-up roller motor was on, the pick-up roller HP sensor did not detect
the pick-up roller at the home position within the specified number of pulses.
• While the pick-up roller motor was on, the pick-up roller HP sensor did not detect
the pick-up roller at the home position above the specified number of pulses.
Note: In both cases, 1 error count indicates a jam, 2 error counts cause this SC code.
• The pick-up motor, pick-up roller HP sensor harnesses, connectors were loose,
broken, defective
• Pick-up motor overload due to an obstruction
• Pick-up motor defective
• Pick-up roller HP sensor defective
SC775Jogger Top Fence Motor: 3K Finisher B830

The top fence HP sensor detected that:
The top fence did not arrive at the home position within the specified number of pulses.
-or-
The top fence failed to leave the home position within the specified number of pulses.

If the jogger top fence motor is operating:
1. Top fence HP sensor harness loose, broken, defective
2. Top fence HP sensor defective
If the jogger top fence motor is not operating:
1. Motor blocked by an obstruction
2. Motor harness loose, broken, defective
3. Motor defective
4. Finisher main board defective
SC776Jogger Bottom Fence Motor (B830)

The bottom fence HP sensor detected that:
The bottom fence did not arrive at the home position at the specified time.
-or-
The bottom fence failed to leave the home position at the specified time.
If the jogger bottom fence motor is operating:
1. Bottom fence HP sensor harness loose, broken, defective
2. Bottom fence HP sensor defective
If the jogger bottom fence motor is not operating:
1. Motor blocked by an obstruction
2. Motor harness loose, broken, defective
3. Motor defective
4. Finisher main board defective
SC780Z-Fold Feed Motor Error

The feed motor that drives the feed rollers
and exit rollers in the Z-fold unit is not
operating. The 1st alert signals a jam, the
2nd alert triggers this SC.
• Motor harness loose, broken,
defective
• Motor blocked by an obstruction
• Motor defective
SC781Z-Fold Lower Stopper Motor Error

The lower stopper failed to leave the
home position with the specified number
of motor pulses.
Note: The 1st detection failure causes a
jam error, and the 2nd failure causes this
SC code.
• Lower stopper motor disconnected,
defective
• Lower stopper motor overloaded due
to obstruction
• Lower stopper HP sensor
disconnected, defective
SC782Z-fold Upper Stopper Motor

The upper stopper failed to leave
the home position with the specified
number of motor pulses.
Note: The 1st detection failure
causes a jam error, and the 2nd
failure causes this SC code.
• Upper stopper motor disconnected,
defective
• Upper stopper motor overloaded due to
obstruction
• Upper stopper HP sensor disconnected,
defective
SC784Z-Fold Timing Sensor Adjustment Error 1

The output voltage light emitted
from the sensor changed, but the
return input was not sufficient to
attain V0.
• Sensor, mirror dirty from paper dust, other
particles
• Harness loose, broken, defective
• Mirror out of position
SC785Z-Fold Timing Sensor Adjustment Error 2

The output voltage light emitted
from the sensor changed, but the
return input was not sufficient to
attain V0.
• Sensor, mirror dirty from paper dust, other
particles
• Harness loose, broken, defective
• Mirror out of position
SC786Z-Fold Memory Error

Several attempts to write to the Zfold
memory failed.
• Turn the machine power off/on
• EEPROM on Z-Folder main board
defective
SC817Boot loader error *GW

The boot loader cannot read one of
the following: self-diagnostic
module, kernel, or one of the files
of the root file system, or the check
of one of these items on the system
SD card failed.
• File or module on the system SD card is
corrupted
• File or module on the system SD card is
illegal
• Make sure that the system SD card is the
one designed for the machine
• Replace controller board.
SC819Fatal kernel error *GW

Due to a control error, a RAM overflow
occurred during system processing. One of
the following messages was displayed on the
operation panel.

0x696e init died
0x766d vm_pageout: VM is full
4361 Cache Error
Other
• System program defective
• Controller board defective
• Optional board defective
• Replace controller firmware
SC821Self-diagnostic error 1: ASIC *GW

The ASIC provides the central point for the control of bus arbitration for CPU access,
for option bus and SDRAM access, for SDRAM refresh, and for management of the
internal bus gate.

Error code 0xffff ffff is returned
when the register Write & Verify
check is executed on the ASIC
mounted on the controller board.
The ASIC controls the ROM and
buses for other devices.
ASIC not detected
Failed to initialize or could not read
connection bus. Data in SHM
register incorrect.
• ASIC (controller board
defective)
• ASIC (controller board
defective)
• Poor connection between
North Bridge and PCI I/F:
Replace controller board
• Replace controller board
SC822Self-diagnostic error 2: HDD *GW

Check performed when HDD is
installed:
HDD device busy for over 31 s.
After a diagnostic command is set
for Sthe HDD, but the device
remains busy for over 6 s.
A diagnostic command is issued
to the HDD device but the result is
an erro

No response to the selfdiagnostic
command from the
ASIC to the HDDs

Mandolin does not respond, the
HDD device remains BUSY for
more than 31 s, or the BUSY
signal does not drop within 6 s
after the diagnostic command is
issued to the HDDs.

Error returned from HDD in
response to the self-diagnostic
command, Mandolin could not
be located due to a read/write
error at the HDD register.
• HDD defective
• HDD harness disconnected,
defective
• Controller board defective
• HDD defective
• HDD defective
• HDD connector loose or
defective
• Controller defective
• HDD defective
SC824Self-diagnostic error 3: NVRAM *GW

NVRAM device does not exist,
NVRAM device is damaged, NVRAM
socket damaged
• NVRAM defective
• Controller board defective
• NVRAM backup battery exhausted
• NVRAM socket damaged
SC829Self-diagnostic error 5: Optional RAM

Verify error for optional
RAM.
• Make sure that the resident RAM is installed in the
correct slot.
• Make sure the optional RAM is installed in the
correct slot (Slot 0)
SC833Self-diagnostic error 8: Engine I/F ASIC *GW

ASIC (Mandolin) for system
control could not be detected.
After the PCI configuration, the
device ID for the ASIC could not
be checked.

The read/write check done for
resident RAM on the mother
board could not be done
correctly.

Could not initialize or read the
bus connection.

Value of the SSCG register is
incorrect.
• Replace the VBCU
• Replace the VBCU.
• Check for loose connections at VBCU.
• Replace VBCU
• Check for loose connections at VBCU.
• Replace VBCU
SC834Self-diagnostic error 9: Optional Memory RAM DIMM

The write/verify check for the optional
RAM chip on the controller board
returned an error.
• Controller defective
SC850Net I/F error

Duplicate IP addresses.
Illegal IP address.
Driver unstable and cannot be
used on the network.
• IP address setting incorrect
• Ethernet board defective
• Controller board defective
SC858Data Encryption Error 1

These are errors of the HDD Data Encryption Option D377.
Key Acquistion
HDD Key Setting
Error
NVRAM Read Error
NVRAM Before
Replace Error
Other Error
Key could be acquired.
• Replace the controller board
The key was acquired but the HDD could not be set.
• Turn the machine power off/on several times.
• Replace the controller board.
NVRAM data conversion failed (mismatch with nvram.conf)
• Replace the NVRAM
DFU. May occur during development.
• Turn the machine power off/on several times.
• Replace the controller board.
An unexpected error occurred while data was being
converted. This error is the same as SC991. See SC991
below.
SC859Data Encryption Error 2

These are errors of the HDD Data Encryption Option D377.
HDD Check Error
Power Loss During Data
Conversion
Data Read Command
Error
Data conversion was attempted with no HDD unit present.
• Confirm that HDD unit installed correctly
• Initialize HDD with SP5832-1
Note: After installation, a new HDD should be formatted
with SP5832-1
Data conversion stopped before NVRAM/HDD data was
converted.
• Format HDD with SP5832-1
More than two illegal DMAC communications were
returned.
• HDD defective
• Format HDD with SP5832-1
• Replace HDD
SC861HDD re-try failure *GW

At power on with the HDD detected,
power supply to the HDD is
interrupted, after the HDD is
awakened from the sleep mode, the
HDD is not ready within 30 s.
Harness between HDD and board
disconnected, defective
HDD power connector disconnected
HDD defective
Controller board defective
SC863HDD data read failure *GW

The data written to the HDD cannot
be read normally, due to bad
sectors generated during
operation.
HDD defective
Note: If the bad sectors are generated at the
image partition, the bad sector information is
written to NVRAM, and the next time the HDD
is accessed, these bad sectors will not be
accessed for read/write operation.
SC864HDD data CRC error *GW

During HDD operation, the HDD
cannot respond to an CRC error
query. Data transfer did not execute
normally while data was being
written to the HDD.
HDD defective
SC865HDD access error *GW

HDD responded to an error during
operation for a condition other than
those for SC863, 864.
HDD defective.
SC867SD card error 2: SD card removed *GW

The SD card in the boot slot when
the machine was turned on was
removed while the machine was on.
Insert the SD card, then turn the machine off and
on.
SC868SD card error 3: SD card access *GW

An error occurred while an SD card
was being used.
• SD card not inserted correctly
• SD card defective
• Controller board defective
SC870Address book data error *GW

Address book data on the hard disk was detected
as abnormal when it was accessed from either the
operation panel or the network. The address book
data cannot be read from the HDD or SD card
where it is stored, or the data read from the media
is defective.

More Details
• Do SP5846-50 (UCS Settings – Initialize all Directory Info.) to reset all address
book data.
• Reset the user information with SP5832-6 (HDD Formatting– User Info).
• Replace the HDDs.
• Boot the machine from the SD card.
• Software defective.
• Cycle the machine off/on.
• Replace controller firmware.
• HDD defective.
SC874Delete All error 1: HDD *GW

A data error was detected for the HDD/
NVRAM after the Delete All option was
used.
Note: The source of this error is the Data
Overwrite Security Unit running from an SD
card.
• Turn the main switch off/on and try
the operation again.
• Install the Data Overwrite Security
Unit again..
• HDD defective
SC875Delete All error 2: Data area *GW

An error occurred while the machine deleted
data from the HDD.
Note: The source of this error is the Data
Overwrite Security Unit D377 running from an
SD card.
• Cycle the machine off/on.
• Try the operation again.
SC901Mechanical Counter 1 error

Mechanical Counter 1 was not set
correctly at power on, or the
operator disconnected the counter
while machine was operating.
• Mechanical Counter 1 connection loose
or defective
• Mechanical Counter 1 defective
SC902Mechanical Counter 2 error

Mechanical Counter 2 was not set
correctly at power on, or the
operator disconnected the counter
while machine was operating.
• Mechanical Counter 2 connection loose
or defective
• Mechanical Counter 2 defective
SC910External controller error 1 *GW
SC911External controller error 2 *GW
SC912External controller error 3 *GW
SC913External controller error 4 *GW

The external controller (Fiery) sends an
error message.
• Turn the machine power off/
on
SC914External controller error 5 *GW

The external controller (Fiery) sends an error
message.
• Turn the machine power off/
on
SC919External controller down *GW

The EAC received an interrupt signal from the
FLUTE serial driver during print jobs in progress
and the connection between the copier and
external controller was broken.
Note: The EAC is the External Api Converter.
• Switch the machine off and
on.
SC925Net File function error *GW

The NetFile file management on the HDD cannot be used, or a NetFile management
file is corrupted and operation cannot continue. The HDDs are defective and they
cannot be debugged or partitioned, so the Scan Router functions (delivery of received
faxes, document capture, etc.), Web services, and other network functions cannot be
used.
HDD status codes are displayed below the SC code:
• Refer to the four procedures below (Recovery from SC 925).