Code: H3-02
Description:
Lower thermistor high temperature trouble (PRTH). The fusing temperature in the PWB exceeds the specified level
Causes:
Thermistor trouble, control PWB trouble. Fusing section connector connection trouble. AT power source trouble.
Remedy:
Check blinking of the heater lamp with Sim. 5-2. If the heater lamp blinks normally, check the thermistor and the harness. Check the thermistor input circuit section of the control PWB. It the lamp keeps ON, check the AC PWB, the control PWB lamp control circuit. Cancel the trouble with Sim. 14.
Code: H4-00
Description:
Non-contact main thermistor low temperature trouble (RTH1-d). The set temperature is not reached with the specified time after turning on the power relay
Causes:
Thermistor trouble. Heater lamp trouble. PCU PWB trouble. Thermostat trouble. AC power source trouble. Interlock switch trouble
Remedy:
Check blinking of the heater lamp with Sim. 5-2. If the lamp blinks normally, check the thermistor and the harness. Check the thermistor input circuit section of the PCU PWB. If the lamp does not light up, check the heater lamp and the thermostat for breakage. Check the interlock switch. Check the AC PWB and the PCU PWB lamp control circuit. Cancel the trouble with Sim. 14.
Code: H4-01
Description:
Sub thermistor low temperature trouble (RTH2). The set temperature is not reached with the specified time after turning on the power relay
Causes:
Thermistor trouble. Heater lamp trouble. PCU PWB trouble. Thermostat trouble. AC power source trouble. Interlock switch trouble.
Remedy:
Check blinking of the heater lamp with Sim. 5-2. If the lamp blinks normally, check the thermistor and the harness. Check the thermistor input circuit section of the PCU PWB. If the lamp does not light up, check the heater lamp and the thermostat for breakage. Check the interlock switch. Check the AC PWB and the PCU PWB lamp control circuit. Cancel the trouble with Sim. 14.
Code: H4-02
Description:
Lower thermistor low temperature trouble (PRTH). The set temperature is not reached with the specified time after turning on the power relay
Causes:
Thermistor trouble. Heater lamp trouble. PCU PWB trouble. Thermostat trouble. AC power source trouble. Interlock switch trouble
Remedy:
Check blinking of the heater lamp with Sim. 5-2. If the lamp blinks normally, check the thermistor and the harness. Check the thermistor input circuit section of the PCU PWB. If the lamp does not light up, check the heater lamp and the thermostat for breakage. Check the interlock switch. Check the AC PWB and the PCU PWB lamp control circuit. Cancel the trouble with Sim. 14.

Code: H4-30
Description:
Non-contact main thermistor differential input abnormality (RTH1-d). The differential value does not rise above the specified level within the specified time from turning ON the HL1.
Causes:
Thermistor trouble, heater lamp trouble, PCU PWB trouble, thermostat trouble, AC power trouble. Interlock switch trouble.
Remedy:
Use Sim. 5-2 to check the flashing operation of the heater lamp. If the heater lamp flashes normally, check the thermistor and the harness. Check the thermistor input circuit section of the PCU PWB. If the heater lamp does not light up, check for disconnection of the heater lamp or the thermostat. Check the interlock switch. Check the lamp control circuit of the AC PWB and the PCU PWB. Use Sim. 14 to cancel the trouble.
Code: H5-01
Description:
POIND not-reached jam is detected 5 times continuously
Causes:
A fusing jam is not canceled completely. (Jam paper remains.) POD1 sensor trouble or harness connection trouble. Fusing unit instillation trouble.
Remedy:
Check the fusing section jam paper. (winding, etc.) Check the POD1 sensor harness. Check installation of the fusing unit. Cancel the trouble with Sim. 14.
Code: H7-10
Description:
Low temperature detection in the reset operation of temperature adjustment after alarm stop in a job (Noncontactmain thermistor(RTH1-d)). When in fusing alarm stopping, the specified temperature is not reached within the specified time. * Alarm stop: When the fusing temperature lowers than the specified level in a print job, the job is interrupted temporarily and temperature reset is performed.
Causes:
Thermistor trouble, thermostat trouble, heater lamp trouble, PCU PWB trouble, AC power trouble, interlock switch trouble, connector and harness connection trouble.
Remedy:
Use Sim. 5-2 to check the ON operation of the heater lamp. Check conduction of the thermostat. Replace the heater lamp, the PCU PWB, and the AC PWB. Check connection of the connector and the harness.
Code: H7-11
Description:
Low temperature detection in the reset operation of temperature adjustment after alarm stop in a job (Sub thermistor (RTH2)). When in fusing alarm stopping, the specified temperature is not reached within the specified time. * Alarm stop: When the fusing temperature lowers than the specified level in a print job, the job is interrupted temporarily and temperature reset is performed.
Causes:
Thermistor trouble, thermostat trouble, heater lamp trouble, PCU PWB trouble, AC power trouble, interlock switch trouble, connector and harness connection trouble.
Remedy:
Use Sim. 5-2 to check the ON operation of the heater lamp. Check conduction of the thermostat. Replace the heater lamp, the PCU PWB, and the AC PWB. Check connection of the connector and the harness.
Code: H7-12
Description:
Low temperature detection in the reset operation of temperature adjustment after alarm stop in a job (Lower thermistor (RTH2)). When in fusing alarm stopping, the specified temperature is not reached within the specified time. * When in fusing alarm stopping, the specified temperature is not reached within the specified time.
Causes:
Thermistor trouble, thermostat trouble, heater lamp trouble, PCU PWB trouble, AC power trouble, interlock switch trouble, connector and harness connection trouble.
Remedy:
Use Sim. 5-2 to check the ON operation of the heater lamp. Check conduction of the thermostat. Replace the heater lamp, the PCU PWB, and the AC PWB. Check connection of the connector and the harness.
Code: L1-00
Description:
Mirror feed trouble. Mirror feed is not completed within the specified time
Causes:
Mirror unit trouble. The mirror wire is disengaged. Circuit trouble.
Remedy:
Use Sim. 1-1 to check the operation of the mirror. Check the mirror motor related circuits (SCN-Mother PWB, SCNCNT PWB, Mhp sensor PWB).
Code: L2-10
Description:
CCD cooling fan motor trouble (SCU detection). The lock signal is detected during rotation of the fan / The non-lock state is detected when the motor is not rotated in booting
Causes:
Fan motor trouble, fan motor related harness and circuit trouble.
Remedy:
Check the fan motor related circuits (SCN-Mother PWB, SCNCNT PWB) and their harness and connector.
Code: L2-11
Description:
Lamp cooling fan motor trouble (SCU detection). The lock signal is detected during rotation of the fan / The non-lock state is detected when the motor is not rotated in booting
Causes:
Fan motor trouble, fan motor related harness and circuit trouble.
Remedy:
Check the fan motor related circuits (SCN-Mother PWB, SCNCNT PWB) and their harness and connector.

Code: L3-00
Description:
Mirror return trouble. Mirror return is not completed within the specified time
Causes:
Mirror unit trouble. The mirror wire is disengaged. Circuit trouble.
Remedy:
Use Sim. 1-1 to check the operation of the mirror. Check the mirror motor related circuits (SCN-Mother PWB, SCNCNT PWB, Mhp sensor PWB).
Code: L4-01
Description:
Main motor lock trouble. The motor lock signal is detected during rotation of the main motor (MM/MM2)
Causes:
Main motor (MM/MM2) lock trouble. Connection failure or disconnection of the connector and the harness. Control circuit trouble.
Remedy:
Use Sim. 6-1 to check the operation of the main motor (MM/MM2) lock. Check the harness and the connector. (between the PCU PWB and the motor, between the HL PWB and the motor)
Code: L4-02
Description:
Drum motor lock trouble. When warming up, the paper feed motor is rotated when canceling a jam, the lock signal is not detected within 1sec.
Causes:
Paper feed motor trouble. Harness connection trouble between the PCU PWB and the paper feed motor. Control circuit trouble.
Remedy:
Check the paper feed motor operation with Sim. 6-1. Check connection of the connector and the harness between the PCU PWB and the paper feed motor.
Code: L4-03
Description:
Fusing motor lock trouble. The motor lock signal is detected during rotation of the fusing motor
Causes:
Fusing motor trouble. Harness connection trouble between the PCU PWB and the developing motor. Control circuit trouble.
Remedy:
Check the fusing motor operation with Sim. 6-1. Check connection of the harness and the connector between the PCU PWB and the developing motor.
Code: L4-04
Description:
Developing motor trouble. The motor lock signal is detected during rotation of the developing motor
Causes:
Developing motor trouble. Harness connection trouble between the PCU PWB and the developing motor. Control circuit trouble.
Remedy:
Check the developing motor operation with Sim. 25-1. Check connection of the connector and the harness between the PCU PWB and the developing motor.
Code: L4-08
Description:
Waste toner transport pipe lock. Waste toner lock is detected during rotation of the drum motor.
Causes:
Waste toner transport pipe lock. (clogging) Waste toner lock sensor trouble. Waste toner lock detection mechanism trouble.
Remedy:
Use Sim. 6-1 to check the operations of the drum motor. Check for clogging in the waste toner transport pipe. Check the waste toner lock sensor.
Code: L4-14
Description:
Toner cartridge motor lock trouble. Though the toner cartridge motor is rotated for a certain time, the toner cartridge motor rotation sensor count value does not exceed the threshold value
Causes:
Toner cartridge motor trouble. Toner cartridge motor rotation sensor trouble. Harness connection trouble between the PCU PWB and the toner cartridge motor. Harness trouble between the PCU PWB and the toner cartridge motor rotation sensor. Toner cartridge trouble.
Remedy:
Use Sim. 10-1 to check the operation of the toner cartridge motor. Use Sim. 10-3 to check the operation of the toner cartridge motor rotation sensor. Check the harness and the connector between the PCU PWB and the toner cartridge motor. Check the harness and the connector between the PCU PWB and the toner cartridge motor rotation sensor. Replace the toner cartridge.
Code: L4-15
Description:
Fusing front PG control error. FPGhp is not changed over during the initializing operation of the fusing front PG motor
Causes:
Fusing front PG motor trouble. FPGhp sensor trouble. PCU PWB trouble. Harness connection trouble between the PCU PWB and the fusing front PG motor. Harness connection trouble between the PCU PWB and the FPGhp.
Remedy:
Use Sim. 6-1 to check the operation of the fusing front PG motor. Use Sim. 30-1 to check the FPGhp sensor. Check the harness and the connector between the PCU PWB and the fusing front PG motor. Check the harness and the connector between the PCU PWB and the FPGhp.

Code: L4-29
Description:
HDD cooling fan motor trouble. The motor lock signal is detected during rotation of the HDD fan motor.
Causes:
Fan motor trouble. Harness connection trouble between the controller PWB and the fan motor. Control circuit trouble.
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the controller PWB and the fan motor.
Code: L4-30
Description:
Controller fan motor trouble. The motor lock signal is detected during rotation of the controller fan motor. The motor lock signal is detected during rotation of the HDD fan motor.
Causes:
Fan motor trouble. Harness connection trouble between the controller. PWB and the fan motor. Control circuit trouble.
Remedy:
Check the fan motor operation with Sim. 6-2. Check connection of the harness and the connector between the controller PWB and the fan motor.
Code: L4-31
Description:
Machine heat exhaust fan 1 trouble. The lock signal is detected during operation of the machine heat exhaust fan.
Causes:
Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.
Code: L4-32
Description:
Power cooling fan 1 / 2 trouble. The lock signal is detected during operation of the power cooling fan
Causes:
Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.
Code: L4-34
Description:
Polygon cooling fan trouble. The lock signal is detected during the operation of the polygon cooling fan.
Causes:
Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.
Code: L4-36
Description:
Toner suction fan trouble. The lock signal is detected during operation of the toner suction fan.
Causes:
Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.
Code: L4-38
Description:
Reverse transport cooling fan trouble. The lock signal is detected during operation of the reverse transport cooling fan.
Causes:
Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.
Code: L4-39
Description:
Reverse cooling fan trouble. The lock signal is detected during operation of the reverse cooling fan
Causes:
Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.

Code: L4-40
Description:
Ozone exhaust fan 1 trouble. The lock signal is detected during operation of the ozone exhaust fan
Causes:
Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.
Code: L4-41
Description:
Ozone exhaust fan 2 trouble. The lock signal is detected during operation of the ozone exhaust fan
Causes:
Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.
Code: L4-43
Description:
Paper cooling fan trouble. The lock signal is detected during operation of the paper cooling fan
Causes:
Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.
Code: L4-46
Description:
Development cooling fan 1 trouble. The lock signal is detected during operation of the developing cooling fan
Causes:
Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.
Code: L4-47
Description:
Power cooling fan 3 trouble. The lock signal is detected during operation of the power cooling fan
Causes:
Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.
Code: L4-48
Description:
ADU section paper cooling fan 1 trouble. The lock signal is detected during operation of the ADU section paper cooling fan
Causes:
Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.
Code: L4-49
Description:
ADU section paper cooling fan 2 trouble. The lock signal is detected during operation of the ADU section paper cooling fan
Causes:
Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.
Code: L4-50
Description:
Process cooling fan 1 trouble. The lock signal is detected during operation of the process cooling fan
Causes:
Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.

Code: L4-51
Description:
Process cooling fan 2 trouble. The lock signal is detected during operation of the process cooling fan
Causes:
Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.
Code: L4-52
Description:
Process cooling fan 3 trouble. The lock signal is detected during operation of the process cooling fan
Causes:
Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.
Code: L4-53
Description:
Process cooling fan 4 trouble. The lock signal is detected during operation of the process cooling fan
Causes:
Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.
Code: L4-54
Description:
PS cooling fan trouble. The lock signal is detected during operation of the PS cooling fan
Causes:
Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.
Code: L4-55
Description:
Process cooling fan trouble. The lock signal is detected during operation of the process cooling fan
Causes:
Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
Remedy:
Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.
Code: L6-10
Description:
Polygon motor trouble. It is judged that the lock signal of the LSU polygon motor is not outputted. When the lock signal is checked 7sec after starting the polygon motor rotation, it is judged that the polygon motor does not rotate normally.
Causes:
Disconnection or breakage of the LSU connector or the harness inside the LSU. Polygon motor trouble. LSU PWB trouble.
Remedy:
Check the polygon motor operation with Sim. 61-1. Check connection of the harness and the connector. If the trouble still remains, replace the LSUcnt PWB or replace the LSU PWB.
Code: L8-01
Description:
NO full wave signal
Causes:
PCU PWB trouble. Power unit trouble. Harness trouble.
Remedy:
Replace the PCU PWB. Replace the power unit. Check connection of the connector and the harness.
Code: L8-05
Description:
No full wave signal (PCU detection)
Causes:
Disconnection or breakage of the connector to the PCU PWB or the harness in the power unit. PCU PWB trouble. Power unit trouble.
Remedy:
Check connection of the harness and the connector. Replace the PCU PWB. Replace the power unit.

Code: L8-20
Description:
Power controller communication trouble. Communication establishment error / framing / parity/ protocol error
Causes:
Connection trouble of the connector between the mother board and the MFPC PWB. MFPC PWB mother board connector pin breakage.
Remedy:
Check connection of the connector between the mother board and the MFPC PWB. Check grounding of the machine.
Code: U1-01
Description:
Battery abnormality. Backup SRAM battery voltage fall
Causes:
Battery life. Battery circuit abnormality.
Remedy:
Check that the battery voltage is about 2.5V or above.
Code: U2-00
Description:
EEPROM read / write error (ICU)
Causes:
EEPROM device trouble. EEPROM device connection trouble. Device access error due to noises
Remedy:
Replace the EEPROM device. Check installation of the EEPROM device. Replace the ICU PWB.
Code: U2-05
Description:
HDD / SRAM Flash / EEPROM discrepancy. The HDD or the SRAM which differs from what was installed before turning off the power is installed
Causes:
HDD replacement or SRAM replacement
Remedy:
Initialize the authentication information with Sim. 16. Import the backup (export data by device cloning) if any.
Code: U2-10
Description:
SRAM user authentication index check sum error. User index information (user authentication basic data) check sum error on the SRAM
Causes:
SRAM trouble. Control circuit malfunction. ISU PWB SRAM access circuit trouble.
Remedy:
Use Sim. 16 to develop the user index information save data from the HDD to the SRAM.
Code: U2-11
Description:
Counter check sum error (ICU). A check sum error of the counter information on the EEPROM occurs
Causes:
EEPROM device trouble. EEPROM device contact trouble. Device access error due to noises.
Remedy:
Cancel the U2 trouble.
Code: U2-22
Description:
SRAM memory check sum error (MFP)
Causes:
SRAM trouble. Control circuit malfunction due to noises. MFP PWB SRAM access circuit trouble.
Remedy:
Initialize the communication management table registered in the SRAM and the FAX soft switch setting. Since the registered contents are deleted, register the deleted contents again. Use Sim. 16 to cancel the U2 trouble. Replace the MFP PWB.
Code: U2-23
Description:
SRAM memory individual data check sum error (MFP). MFP PWB SRAM memory individual data check sum error (communication management table, sender registration data, etc.)
Causes:
SRAM trouble. Control circuit malfunction due to noises. MFP PWB SRAM access circuit trouble.
Remedy:
Turn OFF / ON the power to initialize the data related to the content of check sum error. Since the registered content is deleted, register the deleted content again. All the SRAM contents are set to 0 (default) in production. In this case, it is not treated as the U2-22 trouble, but the SRAM contents are initialized by the software. (The default values of the software are set.) Use Sim. 16 to cancel the U2 trouble. Replace the MFP PWB.

Code: U2-24
Description:
SRAM memory user authentication counter check sum error
Causes:
SRAM trouble. Control circuit malfunction due to noises. ICU PWB SRAM access circuit trouble.
Remedy:
Recheck the check sum of the user counter with Sim.16 and save the normal sum value.
Code: U2-25
Description:
Flash memory user authentication counter check sum error
Causes:
Flash trouble. Control circuit malfunction due to noises. ICU PWB Flash access circuit malfunction.
Remedy:
Recalculate the user counter check sum with Sim.16, and save the normal sum value.
Code: U2-30
Description:
Production number data discrepancy (ICU-PCU). The production number saved in the PCU differs from that saved in the ICU
Causes:
When replacing the PCU/ ICU PWB, the EEPROM is not changed.
Remedy:
Check that the EEPROM is properly set. When replacing the PWB, check that the EEPROM before replacement is inserted to the PWB after replacement.
Code: U2-50
Description:
HD section individual data check sum error (MFP). W-ICU PWB HD individual data check sum error. (One touch, group, program, etc.)
Causes:
Read /write trouble from/ to HD. Control circuit malfunction due to line noise. W-ICU PWB HD access circuit trouble.
Remedy:
Turn OFF / ON the power to initialize the data related to the content of check sum error. Since the registered content is deleted, register the deleted content again. Use Sim. 16 to cancel the U2 trouble. Replace the HD. Replace the MFPC, W-ICU PWB.
Code: U2-80
Description:
EEPROM read / write error (SCU detection)
Causes:
EEPROM trouble. Installation of non-initialized EEPROM. SCU PWB EEPROM access circuit trouble.
Remedy:
Check that the EEPROM is properly set. To keep the counter data and the adjustment values, use the simulation to save the counter data and the adjustment values. (When there is a printer option, execute Sim.22-1 to save the counter data and the adjustment values.) Replace the SCU PWB. Use Sim. 16 to cancel the trouble.
Code: U2-81
Description:
EEPROM check sum error (SCU detection)
Causes:
EEPROM trouble. Control circuit malfunction due to line noise. SCU PWB EEPROM access circuit trouble.
Remedy:
Check that the EEPROM is properly set. To keep the counter data and the adjustment values, use the simulation to save the counter data and the adjustment values. (When there is a printer option, execute Sim. 22-1 to save the counter data and the adjustment values.) Replace the SCN PWB. Use Sim. 16 to cancel the trouble.

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