Service manual

SC TABLE
SM 4-17 G130/G131
SC No. Item Definition Possible Cause
Related
SCs
Troubleshooting Procedure Type
SC 391 Charge AC:
output error
391-01: K
391-02: Y
391-03: M
391-04: C
The high voltage supply board
sends the feedback signal
(CN203-2 to 5; MCYK). The
BCU checks these feedback
signals every 8 ms. If the
average of the sampled data is
not within the control target 20
consecutive times, this SC
code is generated.
• Power pack
disconnected
• Charge receptacle or
terminal
• Defective PCU bias
input terminal
• Incorrect power pack
B/C output
• Damaged cable
• Defective BCU
• PCU not found
1. Turn the main switch off and on.
2. Check the connector.
3. Check that the PCU is correctly
installed.
4. Check the PCU charge voltage input
(the spring/conducting shaft) or
replace the PCU.
5. Replace the power pack B/C.
6. Replace the cable.
7. Replace the BCU.
D
SC 392 Air pump motor
error
392-001: MY
392-002: CK
Three consecutive errors are
detected in motor-driver-signal
samples. The samples are
collected every 0.01 second.
• Damaged cable
• Short circuit
• Defective motor
1. Turn the main switch off and on.
2. Replace the air pump.
3. Check the circuit.
D
SC 440 Drum motor
error
440-001: Black
440-002: Color
No drum gear position sensor
signal is detected within 0.8
second (G130: 125 mm/s,
G131: 162 mm/s) or 2.0
seconds (81 mm/s).
• Defective PCU
• Defective drum motor
• Defective drum gear
position sensor
1. Turn the main switch off and on.
2. Check and/or replace the PCU.
3. Check and/or replace the sensor.
D
SC
460-
001
Thermistor 1
error (open
circuit)
When the temperature
detected by thermistor 1, which
is at the left (fusing unit) side of
the laser optics unit, is less
than -30°C for 10 seconds
consecutively, the BCU
determines that the circuit is
open and shows this SC code.
• Thermistor 1 defective
• Cable connection error
• BCU defect
1. Check the cable connections.
2. Replace the thermistor.
3. Replace the BCU.
C