Ricoh MP 7503SP Field Service Manual page 1314

7. Troubleshooting
SC628-01 B
SC628-02 B
SC641-00
1312
IOB-CAPCNT communication break error Japan Only
When the error was issued, a message appeared on the operation panel
display: "V Parts Maintenance Required". The capacitor unit ceased charging
and discharging.
• A break (LOW signal) did not release at startup, or a break (LOW signal)
was received while the communication circuit was connected to
CAPCNT.
• The machine set charge/discharge control to the OFF state, but the
machine can continue operations that do not use the capacitor.
• The serial line is unstable
• External electrical noise on power line or around the machine.
• Electrical short in the IOB-CAPCNT harness
• Capacitor control board (CAPCNT) damaged
• Cycle the machine off/on.
• If the problem persists, inspect the IOB-CAPCNT harness, connectors,
and replace if damaged.
• Replace the capacitor control board (CAPCNT).
IOB-CAPCNT communication timeout error Japan Only
There was no ACK returned within 100 ms after one frame of data was sent to
CAPCNT.
• The serial line is unstable
• External electrical noise on power line or around the machine.
• Electrical short in the IOB-CAPCNT harness
• Capacitor control board (CAPCNT) damaged
• Cycle the machine off/on.
• If the problem persists, inspect the IOB-CAPCNT harness, connectors,
and replace if damaged.
• Replace the capacitor control board (CAPCNT).
D Communication error between BICU and controller CTL