• Code: L4 07
• Description: Transfer belt motor trouble
• Causes: 1) Before driving the drum, the calibration plate is opened with the process control BK sensor, and light is emitted with the gain value of 0 and with the light emitting quantity fixed to 120. The average of ten light quantities repeats to be 5 or less for 3 times continuously. 2) Immediately after driving the drum, the calibration plate is opened with the process control BK sensor, and one whole turn of the belt surface is scanned with the gain value of 0 and with the light emitting quantity at the optimum value (120 - 50). The difference between the max. value and the min. value of the scanned data is 5 or less.
• Remedy: Case 1 Cause Transfer belt motor connector disconnection, process control sensor connector disconnection, process control BK sensor defect, defective connection of the harness between the PCU PWB and the transfer belt motor, defective control circuit Check & Remedy Check the transfer belt motor operation with SIM25-1. Check the process control sensor operation with SIM44-2. Check the harness and the connector between the PCU PWB and the transfer belt motor.

• Code: L4 11
• Description: Shift motor trouble
• Causes: When initializing the shift motor, the change in the shift motor home position sensor characteristics is not detected within the specified time.
• Remedy: Case 1 Cause Shift motor trouble, disconnection of the harness between the PCU PWB and the shift motor, control circuit trouble Check & Remedy Use SIM 6-1 to check the shift motor operation. Use SIM 30-1 to check the shift motor home position sensor. Check the harness and the connector between the PCU PWB and the shift motor.

• Code: L8 01
• Description: Full wave signal not provided
• Causes: The full wave signal is not provided.
• Remedy: Case 1 Cause PCU PWB trouble Check & Remedy Replace the PCU PWB. Case 2 Cause Power supply unit trouble Check & Remedy Replace the power supply unit. Case 3 Cause Harness trouble Check & Remedy Check connection of the harness and the connector.

• Code: L8 02
• Description: Full wave signal width abnormality
• Causes: An abnormality of the full wave signal frequency is detected. (The detected frequency is 65kHz or above, or 45kHz or below.)
• Remedy: Case 1 Cause PCU PWB trouble Check & Remedy Replace the PCU PWB. Case 2 Cause Power supply unit trouble Check & Remedy Replace the power supply unit. Case 3 Cause Harness trouble Check & Remedy Check connection of the harness and the connector.

• Code: L8 04
• Description: Main power switch abnormality detection
• Causes: Though the PCU program is operating (the power is supplied), the main power switch OFF is detected.
• Remedy: Case 1 Cause Main power switch trouble Check & Remedy Replace the main power switch. Case 2 Cause Power supply unit trouble Check & Remedy Replace the power supply unit. Case 3 Cause Harness trouble Check & Remedy Check connection of the harness and the connector.

• Code: PF 00
• Description: RIC copy inhibit signal reception
• Causes: The copy inhibit signal from RIC (host) is received.
• Remedy: Case 1 Cause Depends on a judgment by the host. Check & Remedy Make notification to the host. Use SIM 27-1 to ignore.

• Code: U0 00
• Description: ICU-OPE communication trouble (ICU/OPE detection)
• Causes: Communication establishment error, framing/parity/protocol error ROM version mismatching
• Remedy: Case 1 Cause Disconnection of the operation panel communication connector of the ICU/MFP PWB, harness trouble between the ICU PWB and the MFP PWB. Check & Remedy Check the connector and the harness between the ICU PWB and the MFP PWB. Case 2 Cause ICU/MFP PWB trouble Check & Remedy Check grounding of the machine. Replace the ICU PWB or the MFP PWB. Case 3 Cause When the OPE-ROM without security functions is installed for the ICUROM with security kit functions. Check & Remedy Check the ROM version, and replace it if necessary.

• Code: U1 02
• Description: RTC read trouble
• Causes: Abnormal value is read from the RTC on the ICU PWB.
• Remedy: Case 1 Cause RTC circuit abnormality Check & Remedy Set the time again with the key operation, and check that time advances properly. Check the RTC circuit.