Ricoh M178-21, Field Service Manual

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SC547 r2 D Zerocross Error
Power supply frequency is unstable. HVP or PSU failure.
• To reset the SC code, turn the power On and Off.
• Use more stable power supply.
• Replace the HVP or PSU.
SC557 - C Zerocross Frequency Over
Power supply frequency is unstable.
No error message will be issued on this SC. A log of this SC will be
logged in the SOM service mode SC
SC559 c3 A Fusing Unit Third Jam Error (Fatal Error)
The exit sensor failed to detect the leading edge of the paper within the
prescribed time and triggered a jam alert.
• After this error has occurred three times, the machine will shut down
automatically and cannot be re-started until the machine has been
serviced by a service technician.
• Check the paper transport path for any physical obstructions (paper
scraps, etc.)
• Make sure the fusing unit has been installed correctly
• After servicing the machine to solve the problem, the service
technician must execute a "Fuser SC Reset". Otherwise, the machine
will continue to issue this SC code and cannot be operated. (
page 191)
SC587 C0 A Motor Thermistor Error
After starting up, inside of the machine temperature would be checked
every 100ms, then the machine is detected -30°C for 4 sec. or 105°C for
a sec.
• Check the connection or replace the thermistor
• Replace the I/F harness
• Replace main board
6. Troubleshooting
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