Ricoh D131 Service Manual page 513

SC600: Data Communication
Controller start up error
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SC672 D
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D131/D132/D133
After the machine was powered on, communication between the
controller and the operation panel was not established, or
communication with controller was interrupted after a normal
startup.
After startup reset of the operation panel, the attention code (FDH)
or the attention acknowledge code (FEH) was not sent from the
controller within 30 sec..
After the controller issued a command to check the communication
line with the controller at 30-second intervals, the controller failed to
respond twice.
Controller stalled
Controller board installed incorrectly
Controller board defective
Operation panel connector loose, broken, or defective
The controller did not completely shut down when the switch was
turned off.
Check the setting of SP5-875-001.
If this SP is set to "1 (OFF)", change it to "0 (ON)"
2-46
CTL
SM Appendix