Ricoh V-C3 D081 Field Service Manual page 693

PFB communication error
Communication between the VBCU and PFB was interrupted. (Communication status
is monitored at 30 ms intervals.)
SC622 D
• Connection cable between the VBCU and PFB is disconnected, defective
• VBCU defective
• PFB defective
Mailbox-to-copier communication error
Communication between the mailbox and copier is interrupted. An ACK/NCK signal
was not received within 100 ms after a data frame is sent and 3 retries failed.
SC624 D
• Mailbox cable disconnected, defective
• Mailbox main board defective
• VBCU defective
• PSU defective
VBCU-DTMB (DMC1) communication error
Communication between the VBCU and DMC (main) was interrupted. An ACK/NAK
signal was not received within 100 ms after a data frame was sent and three retries
failed.
SC625 D
• Check the DTMB harness connections at the DTMB and VBCU
• DTMB defective
• PSU defective
• VBCU defective
• 5V power supply defective
Service Call Tables
3
115