• Code: SC557
• Description: Pressure roller temperature does not increase - Timing - Checked every second, starting two minutes after the main switch is turned on and ending when the ready temperature is reached. - Condition - For one minute, the pressure roller temperature does not increase by more than 3°C
• Causes: • Poor connections • Blown pressure roller fusing lamp • Opened pressure roller thermofuse • Defective main control board • Defective I/O control board • Defective AC drive board
• Remedy: 1. Make sure the following are connected properly: 2. Pressure roller fusing lamp 3. CN303 on the main control board 4. CN212 and CN229 on the I/O control board 5. CN7 on the AC drive board 6. Replace the pressure roller fusing lamp if it is blown. 7. Replace the hot roller thermofuse if it is opened. 8. Test the main control board, I/O control board, or AC drive board by checking the trigger signal at each pin. [Signal Check] • Pressure roller fusing trigger: CN303-B7 on the main control board/CN212-B5, TP240, or CNCN229-4 on the I/O control board/ CN7-7 on the AC drive board.

• Code: SC558
• Description: Abnormal zero cross signal - Timing & Condition - Zero cross signals generated within certain period do not reach a predetermined target value.
• Causes: • Poor connections • Blown fuse • Defective AC drive board • Defective main control board • Defective I/O control board
• Remedy: 1. Make sure the following are connected properly: • CN212 and CN229 on the I/O control board • CN303 on the main control board • CN7 on the AC drive board 2. Check the current through the signal lines in the above harnesses. 3. Replace the fuse (FU101) if it is blown. 4. Test the AC drive board, I/O control board, or main control board by checking the signal line at each pin. [Signal Check] • Zero cross: CN7-5 on the AC drive board/ CN229-6, TP216, or CN212-B8 on the I/O control board/CN303-B4 or TP120 on the main control board

• Code: SC601
• Description: Scanner IPU communication error - Timing & Condition - After the main control board communicates successfully with the scanner IPU board once, and a communication error is detected.
• Causes: • Poor connections • Defective sub/main scanner IPU board • Defective main control board
• Remedy: 1. Check that connectors CN355 and CN407 are properly connected on the sub control board and scanner IPU board. 2. Replace the sub and/or main scanner IPU board. 3. Replace the main control board.

• Code: SC604
• Description: IDU communication error - Timing & Condition - No response is received from the IDU within 200 ms after the scanner IP board sends a command signal. (this must occur three times before the error is displayed).
• Causes: • Poor connection between the IDU and scanner control boards • Defective IDU board • Defective sub/main scanner IPU board
• Remedy: 1. Make sure the IDU board is properly connected to the sub scanner IPU board. 2. Replace the IDU board. 3. Replace the scanner sub and/or main IPU board.

• Code: SC620
• Description: ADF communication error - Timing & Condition - After the main control board communicates successfully with the ARDF once, and a communication error is detected.
• Causes: • Poor connection or damaged optical-fiber cable • Defective ARDF main board • Defective main control board
• Remedy: 1. Make sure the optical-fiber cable is properly connected to the ADF main board and the main control board. 2. Check for damage to the cable. 3. Replace the ARDF main board. 4. Replace the main control board.

• Code: SC621
• Description: Sorter communication error - Timing - When the main switch is turned on or while Sorter is running - Condition - The main control board detects a communication error with the Sorter main board.
• Causes: • Poor connection or damaged optical-fiber cable • Defective Sorter main board • Defective main control board
• Remedy: 1. Make sure the optical-fiber cable is properly connected to the Sorter main board and main control board. 2. Check for damage to the cable. 3. Replace the sorter main board. 4. Replace the main control board

• Code: SC626
• Description: LCT communication error - Timing - When the main switch is turned on or while LCT is running - Condition - The main control board detects a communication error with the LCT main board.
• Causes: • Poor connection or damaged harness • Defective I/F board RDS/LCT • Defective LCT main board • Defective main control board
• Remedy: 1. Make sure the harness is properly connected to the main control board, I/F board RDS/LCT, and the LCT main board. 2. Check for damage to the harness. 3. Replace the I/F board RDS/LCT. 4. Replace the LCT main board. 5. Replace the main control board.

• Code: SC630
• Description: RDS communication error - Timing & Condition - The main control board receives no response from RDS when accessing it. Even when this error is detected, the copier does not show the SC code and this SC code is not logged. (the copier is still functional)
• Causes: • Poor connections. • Damaged harness or optical-fiber cable. • Defective line adapter • Defective I/F board RDS/LCT • Defective main control board
• Remedy: 1. Make sure the harness and optical-fiber cable are connected properly to the I/F board RDS/LCT and the main control board. 2. Check for damage to the harness or optical-fiber cable. 3. Check and/or change the line adapter settings. 4. Replace the line adapter. 5. Replace the I/F board RDS/LCT. 6. Replace the scanner IPU board.