Ricoh K-C1 Service Manual page 106

SERVICE CALL CONDITIONS
No.
Definition
691 B Communication error between BiCU and fax controller
The BiCU board cannot communicate
with the fax controller.
692 B Communication error between BiCU and printer controller
The BiCU board cannot communicate
with the printer controller.
695 B Fax firmware error
The fax program cannot be started.
(☛ Fax Service Manual)
760 B ADF gate abnormal
The ADF Gate signal line between the
ADF main board and the IOB is
disconnected.
900 B Electrical total counter error
The electrical total counter does not
work properly.
901 B Mechanical total counter
The mechanical total counter does not
work properly.
921 B IMB memory controller error
A memory control job is not completed
within a certain period.
922 B IMB DRAM error
The machine detects a discrepancy in
the IMB DRAM write/read data during
its write/read test (done at power off/on
and at recovery from low power or
night/off mode).
924 B Optional DRAM error
The machine detects a discrepancy in
the Optional DRAM write/read data
during its write/read test (done at power
off/on and at recovery from low power
or night/off mode).
Symptom
4-6
20 February, 2001
Possible Cause
• Poor connection between the BiCU
board and the fax controller
• BiCU board defective
• Fax controller defective
• Poor connection between the BiCU
board and the printer controller.
• BiCU board defective
• Printer controller defective
• The fax firmware download has not
been completed correctly. Try again.
• ADF main board defective
• Input/output board defective
• Poor connection (ADF Gate line)
between the ADF main board and the
IOB.
• NVRAM defective
• Mechanical total counter defective
• IOB defective
• Disconnected mechanical total
counter
• IMB defective
• BiCU defective
• Poor connection between IMB and
BiCU
• IMB defective
• BiCU defective
• Poor connection between BiCU and
IMB
• Non-supported DRAM connected
• Poor connection between IMB and
optional DRAM
• Optional DRAM defective
• IMB defective
• BiCU defective