Ricoh AP-C3, Field Service Manual, Page: 825 / 1334

No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
620 D
ARDF communication error
After the ARDF is detected, the break signal occurs or communication timeout
occurs.
• Incorrect installation of ARDF
• ARDF defective
• IPU board defective
• External noise
1. Check the cable connection of the ARDF.
2. Shut out the external noise.
3. Replace the ARDF.
4. Replace the IPU board.
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
621 D Finisher communication error
622 D Paper tray unit communication error
While the IOB communicates with an optional unit, an SC code is displayed if
one of following conditions occurs.
• The IOB receives the break signal which is generated by the peripherals
only just after the main switch is turned on.
• When the IOB does not receive an OK signal from a peripheral 100ms after
sending a command to it. The IOB resends the command. The IOB does not
receive an OK signal after sending the command 3 times.
• Cable problems
• IOB problems
• BCU problems
• PSU problems in the machine
• Main board problems in the peripherals
1. Check if the cables of peripherals are correctly connected.
2. Replace the IOB or main board of peripherals.
3. Replace the BCU if no power is supplied to peripherals.
Service Call
823