System Control - Ricoh A095 Service Manual

SC545 - Low fusing temperature (detected by the main control board)
SC546 - Low fusing temperature (detected by the optics control board)
Definition: [level: A]
The fusing temperature stays lower than 100 °C for 5 seconds after the
machine becomes ready.
Possible causes:
•
Fusing thermistor defective
•
AC drive board defective
•
Fusing lamp open
•
Main control board defective
•
Optics control board defective
SC547 - Fusing lamp continuously lit
Definition: [level: A]
Fusing lamp continuously lights for 70 seconds after the machine becomes
ready. However, if the door is open, paper jams, or the fusing unit is out of
position, the ready condition is canceled and the main relay opens.
Possible causes:
•
AC drive board
SC548 - Unstable fusing temperature
Definition: [level: A]
If the fusing temperature changes by 21°C/second four times in 1 minute, this
SC is displayed.
Possible causes:
•
AC drive board defective
•
Thermistor defective
Countermeasure:
If this occurs, before replacing the optics PCB and main control board, check
the connection between the main harness and the relay harness (drawer
connector terminals) and the connection between the relay harness and the
thermistor (2P connector).

1.14 SYSTEM CONTROL

SC600 - Communication error (main control board and operation panel)
Definition: [level: D]
The main control board does not communicate with the operation panel.
Possible causes:
•
Main control board defective
•
Operation panel defective
•
Harness defective
FSM 6-17
Rev. 1/20/94
A095/A096/A097