Ricoh AP-C3, Field Service Manual, Page: 830 / 1334

No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
641 D
Communication error: Engine -> Controller (No response)
No response from engine to frame after frame sending from controller with RAPI
protocol. (No response after 3 attempts of sending every 100 ms)
Asserts the error detected by the serial driver from PSC module to SRM with RAPI
command.
1. Turn the main switch off and on.
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
641 D
Engine serial communication error
An error occurs in serial communication with engine.
• SC641-001: Timeout error
• SC641-002: Retry over
• SC641-003: Download error
• SC641-004: UART error
Turn the main switch off and on.
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
650 B Communication error of the remote service modem (Cumin-M)
-01 -
Authentication error
The authentication for the Cumin-M fails at a dial up connection.
• Incorrect SP settings
• Disconnected telephone line
• Disconnected modem board
• Disconnected wireless LAN card
1. Check and set the correct user name (SP5-816-156) and password
(SP5-816-157).
6. Troubleshooting
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