April, 2007 SERVICE CALL CONDITIONS
4-55
SC codes Group 6: Device Communication
ARDF communication error SC620 D
A BREAK signal occurs after the
machine detects the ARDF, or a
communication timeout occurs.
• ARDF disconnected
• IPU board harness disconnected,
defective
• IPU board defective
• Spurious noise from the power supply
line
• ARDF control board defective
Mailbox-to-Finisher communication error SC621 D
Communication between the
mailbox and finisher is
interrupted. An ACK/NCK signal
was not received within 100 ms
after a data frame is sent and 3
retries failed.
• Connection cable between mailbox and
finisher disconnected, defective
• Finisher main board defective
• BICU defective
• PSU defective
LCT communication error SC622 D
Communication between the
copier and LCT is interrupted.
An ACK/NCK signal was not
received within 100 ms after a
data frame is sent and 3 retries
failed.
• Connection cable between the LCT and
copier is disconnected, defective
• LCT main board defective
• BICU defective
• PSU defective
Mailbox-to-copier communication error SC624 D
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.
• Mailbox cable disconnected, defective
• Mailbox main board defective
• BICU defective
• PSU defective
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