No.
Definition
Symptom Possible Cause
590 B
Left exhaust fan motor error
The CPU detects an exhaust fan
lock signal for more than 5
seconds.
Loose connection of the exhaust fan motor
Too much load on the motor drive
621 B
ADF connection error
An incorrect ADF (an ADF for some
other copier) is detected.
ADF incorrect (The ADF for B039/B040/B043
or B121/B122/B123 is installed on this
machine.)
760 B
ADF gate abnormal 1
The ADF Gate signal line between
the ADF
main board and the BICU
is disconnected.
ADF main board defective
Input/output board defective
Poor connection (ADF Gate line) between the
ADF main board and the BICU.
761 B
ADF gate abnormal 2
The FGATE signal is not issued from
the
ADF
within 30 seconds after the
ADF starts feeding.
ADF connector defective
SBU board defective
762 B
ADF gate abnormal 3
The FGATE signal is not terminated
by the
ADF within 60 seconds after
the ADF starts feeding.
ADF connector defective
SBU board defective
901 B
Mechanical total counter
The mechanical total counter does
not work properly.
Mechanical total counter defective
BICU defective
Disconnected mechanical total counter
903 B
Engine total counter error
The checksum of the total counter is
not correct.
NVRAM on the BICU defective
3. Appendix: Troubleshooting Guide
26
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