Ricoh B234 - Page 34

SERVICE CALL CONDITIONS
B234/B235/B236/D101/D102/D103 4-32 SM
Communication Error Between BCU and MCU
SC601 B
One or more of the following occurred:
• The BCU cannot communicate with the MCU
within 100 ms after power on after 3 tries.
• A BREAK signal was detected after
connection between the BCU and MCU.
• After a communication error, three tries to
communicate with the MCU failed.
• Poor connection between
BCU and MCU
• BCU defective
• MCU defective
Communication Error Between BCU and ADF 1
SC620 B
There was no response from the
ADF 100 ms after the ACK
signal was sent to the ADF.
Three attempts to resend the
data failed.
• Poor connection between the BCU board
and the ADF main board
• Interference from external noise on the
harness between the BCU and ADF
Communication Error Between BCU and ADF 2
SC621 B
The machine detected a break
signal (LOW) from the line
connection between the BCU
and ADF.
• Serial line connection unstable
• Harness, connectors between ADF and
BCU loose, broken, defective
Communication Error Between BCU and ADF 3
SC622 B
Software error after improper
user operation.
• Software error
• Cycle the machine off/on
Communication Error Between BCU and Finisher
SC625 B
The BCU cannot communicate with the finisher
properly. here was no response from the ADF
100 ms after the ACK signal was sent to the
ADF. Three attempts to resend the data failed.
• Finisher door was opened
while stacking/stapling was
in progress.
• Poor connection between
the BCU board and the
finisher main board
Communication Error Between BCU and Finisher
SC626 B
A break signal
(LOW) was
detected.
• Poor connection between the BCU board and the
finisher main board
• Finisher main board defective
• BCU board defective
• External electrical noise on the interface cable caused
the serial line to become unstable