Ricoh V-C3 D081 Field Service Manual page 686

3. Appendix: Service Call Conditions
SC545 A
3
SC546 A
SC547 A
SC549 A
108
Lamp remains on
After hot roller reaches warm-up temperature, the center fusing lamps in the heating
roller remained on at full capacity after reaching the warm-up temperature while the
hot roller was not rotating.
• Do SP5810 to cancel the SC fusing code.
• Heating roller thermistor damaged, or out of position
• Fusing lamp disconnected, broken
Heating roller thermistor error (side)
The temperature measured by the heating roller thermistor does not reach 0°C after
50 sec. and remains over this temperature for 10 readings.
• Loose connection of the heating roller thermistor
• Defective heating roller thermistor
Zero cross error
When the main switch is turned on, the machine checks how many zero-cross signals
are generated within 500 ms. This SC code is issued if the number of zero-cross signals
detected is not within specification.
Note: Zero cross signals, generated from an ac power supply, are used to generate
a trigger pulses to control the applied power accurately.
• Do SP5810 to cancel the SC fusing code.
• Electrical noise on the power supply line
• Fusing relay damaged, replace the AC drive board.
Heating roller thermistor (center): software error
The thermistor detected a temperature over 250°C 10 times within 1 sec.
• Do SP5810 to cancel the SC fusing code.
• TRIAC short, AC drive board defective
• VBCU defective