C0520: Fuser Overheat - NEC NEFAX 671 Service Manual

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C0520: Fuser overheat

<Detection Timing>
• The temperature detected by the Thermistor remains higher than 235 °C for a predeter-
mined period of time while the fusing temperature control is being provided.
<Troubleshooting Procedures>
Fusing Unit
Thermistor (TH1)
Fusing Roller Heater Lamp (H1)
Step Action
1 Replace Thermistor (TH1).
2 Replace Fusing Unit.
3 Replace Controller/Mechanical
Control Board (PWB-P).
4 Replace Power Unit (PU1).
Description
Relevant Electric Parts
Controller/Mechanical Control Board (PWB-P)
Thermostat (TS1)
Power Unit (PU1)
Ref. Page
Control Signal
☞ D-28
☞ E-7
☞ D-12
☞ D-15
T-20
WIRING DIAGRAM
Location
(Electric Parts)
– –
– –
– –
– –