Xerox WorkCentre 220

Detection Timing

• The voltage of the Thermistor remains low for a predetermined period of time when a warm-up cycle is started.
• The temperature detected by the Thermistor remains lower than a reference value for a predetermined period of time for the period of time that begins 5 sec. after, and ends 9 sec. after, the start of the warm-up cycle (where the temperature detected by the Thermistor is 80 °C or less).
• The temperature detected by the Thermistor does not increase for a 3-sec. period or more for the period of time that begins after the lapse of a predetermined period of time after the Fusing Roller Heater Lamp has been turned ON and ends when the lamp is turned OFF.
• The Fusing Roller Heater Lamp remains ON for a 30-sec. period or more (except during the period through which the Main Motor remains energized).

Relevant Electrical Parts

• Fusing Unit
• Thermistor (TH1)
• Fusing Roller Heater Lamp (H1)
• Controller/Mechanical Control Board (PWB-P)
• Thermostat (TS1)
• Power Unit (PU1)

Troubleshooting Procedures

Step	Action	Control Signal/ Location
1	Replace Thermistor (TH1).
2	Replace Fusing Roller Heater Lamp (H1).
3	Replace Thermostat (TS1).
4	Replace Fusing Unit.
5	Replace Controller/Mechanical Control Board (PWB-P).
6	Replace Power Unit (PU1).