670 D
Engine startup error
The BCU failed to respond within the
prescribed time when the machine is turn on.
• Connections between BCU and
controller board are loose,
disconnected, or damaged
• Replace the BCU
• Replace the controller board
672 D
Controller startup error
After power on, the line between the
controller and the operation panel did not
open for normal operation.
After normal startup, communication with
the controller stopped.
• Controller stalled
• Controller installed incorrectly
• Controller board defective
• Operation panel harness
disconnected or defective
687 B
PER-command error
The machine does not receive
PAPI-PER command for specific time, after
PAPI-PES was issued.
• Defective controller
688 B
PAPI-PES error
The machine does not receive
PAPI-PES command after paper is in
registration.
• Defective controller
• Poor communication
817 D
Monitor error
This is a file detection and electronic file
signature check error when the boot loader
attempts to read the self-diagnostic module,
system kernel, or root system files from the
OS Flash ROM, or the items on the SD card
in the controller slot are false or corrupted.
• OS Flash ROM data defective;
change the controller firmware
• SD card data defective; use another
SD card
819 C
Fatal kernel error
4. Troubleshooting
60
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