• Code: 31
• Description: Density sensor failure
• Causes: 1 Harness connection failure of density sensor holder ASSY. 2 Harness connection failure of density sensor solenoid ASSY. 3 Density sensor holder ASSY failure. 4 Transfer HVPS PCB unit failure. 5 Engine PCB failure.
• Remedy: 1 Harness connection failure of density sensor holder ASSY Check the harness connection between the density sensor holder ASSY and registration relay PCB, and the one between the registration relay PCB and engine PCB. Then, reconnect them. 2 Harness connection failure of density sensor solenoid ASSY Check the harness connection between the engine PCB and registration relay PCB and reconnect them. 3 Density sensor holder ASSY failure Replace the density sensor holder ASSY. 4 Transfer HVPS PCB unit failure Replace the transfer HVPS PCB unit. 5 Engine PCB failure Replace the engine PCB ASSY.

• Code: 32
• Description: Density sensor shutter performance malfunction
• Causes: 1 Harness connection failure of density sensor holder ASSY. 2 Harness connection failure of density sensor solenoid ASSY. 3 Density sensor holder ASSY failure. 4 Transfer HVPS PCB unit failure. 5 Engine PCB failure.
• Remedy: 1 Harness connection failure of density sensor holder ASSY Check the harness connection between the density sensor holder ASSY and registration relay PCB, and the one between the registration relay PCB and engine PCB. Then, reconnect them. 2 Harness connection failure of density sensor solenoid ASSY Check the harness connection between the engine PCB and registration relay PCB and reconnect them. 3 Density sensor holder ASSY failure Replace the density sensor holder ASSY. 4 Transfer HVPS PCB unit failure Replace the transfer HVPS PCB unit. 5 Engine PCB failure Replace the engine PCB ASSY.

• Code: 33
• Description: Color registration sensor failure
• Causes: 1 Harness connection failure of registration-mark sensor PCB ASSY. 2 Registration-mark sensor PCB failure. 3 Transfer HVPS PCB unit failure. 4 Engine PCB failure.
• Remedy: Harness connection failure of registration-mark sensor PCB ASSY Check the harness connection of the registrationmark sensor PCB ASSY and reconnect it. 2 Registration-mark sensor PCB failure Check the performance of the registration-mark sensor following the procedure described in “Maintenance mode 75”. If any problem occurs, replace the registration-mark sensor PCB ASSY. 3 Transfer HVPS PCB unit failure Replace the transfer HVPS PCB unit. 4 Engine PCB failure Replace the engine PCB ASSY.

• Code: 34
• Description: Color adjustment shutter failure
• Causes: 1 Density sensor shutter catching on some position. 2 Density sensor holder ASSY assembling failure.
• Remedy: 1 Density sensor shutter catching on some position Correct catching of the density sensor shutter. 2 Density sensor holder ASSY assembling failure Reassemble the density sensor holder ASSY correctly.

• Code: 35
• Description: NVRAM failure on Engine PCB
• Causes: 1 Engine PCB failure.
• Remedy: Replace the engine PCB ASSY.

• Code: 36
• Description: Transfer HVPS PCB failure
• Causes: 1 Harness connection failure of transfer HVPS PCB ASSY. 2 Transfer HVPS PCB ASSY failure. 3 Engine PCB failure.
• Remedy: 1 Harness connection failure of transfer HVPS PCB ASSY Check the two harness connections between the transfer HVPS PCB and registration relay PCB, and the two ones between the registration relay PCB and engine PCB. Then reconnect them. 2 Transfer HVPS PCB ASSY failure Replace the transfer HVPS PCB ASSY. 3 Engine PCB failure Replace the engine PCB ASSY.

• Code: 37
• Description: Belt unit temperature sensor failure
• Causes: 1 Belt unit temperature sensor harness connection failure. 2 Transfer HVPS PCB unit failure. 3 Engine PCB failure.
• Remedy: 1 Belt unit temperature sensor harness connection failure Check the harness connection between the belt unit temperature sensor and registration relay PCB, and the one between the registration relay PCB and engine PCB. Then reconnect them. 2 Transfer HVPS PCB unit failure Replace the transfer HVPS PCB unit. 3 Engine PCB failure Replace the engine PCB ASSY.

• Code: 38
• Description: THM sensor failure
• Causes: 1 Harness connection failure of THM/HUM sensor. 2 THM/HUM sensor failure. 3 Engine PCB failure.
• Remedy: 1 Harness connection failure of THM/HUM sensor Check the harness connection of the THM/HUM sensor and reconnect it. 2 THM/HUM sensor failure Replace the THM/HUM sensor holder ASSY. 3 Engine PCB failure Replace the engine PCB ASSY.