Ricoh MP C6502SP Field Service Manual page 1056

5. Troubleshooting
SC No.
1054
Level Error Name/Error Condition/Major Cause/Solution
When SC signals are detected 25 times consecutively in 20ms intervals
(500 msec).
Details:
When the development power pack is shorted, the development power
pack detects it by means of an SC signal (HIGH level). The IOB monitors
the SC signals as explained above.
• Development power pack shorted
Disconnect the high voltage cable from the output terminal of the
development power pack of the corresponding color, and check the
following points.
• PWM: Check the signal of the corresponding color.
• If the signal is fixed to HIGH during photocopying process, replace
the harness or the IOB.
• Check the output of the development power pack of the
corresponding color.
If the output is fixed to HIGH during photocopying process, replace
the power pack.
If the output is normal during photocopying process, test the resistance
between the highvoltage cable and the ground. If resistance is "0" or
nearly "0", replace the high-voltage harness or PCU.