Ricoh M0A0, Service Manual

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6.Troubleshooting
252
SC No. Level Error Name/Error Condition/Major Cause/Solution

Broken fusing lamp wire

The overtemperature prevention mechanism started working

Clear the SP: fusing SC.

Replace the fusing thermistor.

Replace the fusing (Center) lamp.
SC No. Level Error Name/Error Condition/Major Cause/Solution
SC547-
01 D Zero-crossing error (adhered relay contact)
When the fusing relay is in an OFF state, a "zero-crossing interrupt request" occurs in 50 ms.
 Damaged fusing relay (adhered contact)
 Failure in the fusing relay drive circuit
 PSU fuse (24VS) blown
 Unstable frequencies at the commercial power supply

Check the commercial power supply.

Replace the fuse.

Replace the PSU.
SC547-
02 D Zero-crossing error (bad relay contact)
If a "zero-crossing interrupt request" does not occur in three seconds after the fusing relay is in
an ON state, an error results.

Damaged fusing relay (open contact)

Failed fusing relay drive circuit

PSU fuse (24VS) blown

Unstable frequencies at the commercial power supply
 Check the commercial power supply.
 Replace the fuse.
 Replace the PSU.
SC547-
03 D Zero-crossing error (low frequency error)
The number of zero-crossing interrupts does not reach a certain value in 500 ms.
 Unstable frequencies at the commercial power supply
 Check the commercial power supply.
 Replace the PSU.
SC No. Level Error Name/Error Condition/Major Cause/Solution
SC551-00 A Broken fusing (End) thermistor wire
At least ten times, the temperature is detected to stay at -20 degrees C or less for 5 seconds.

Broken thermistor wire

Bad connector contact