Ricoh M0A0 - Page 264

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