Abnormally High Fusing Temperature; High Voltage Failure - Xerox MF Series Technical Document

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Abnormally high fusing temperature

<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 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).
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High voltage failure

<Detection Timing>
• The Drum Charge Monitor Voltage (HVC_MON) signal falls outside a predetermined
range at any time after the lapse of a predetermined period of time after the Power
Switch has been turned ON.
• The Image Transfer Voltage Monitor signal (T_MON_V) and Image Transfer Current
Monitor signal (T_MON_I) fall outside a corresponding predetermined range.
<Troubleshooting Procedures>
Fusing Unit
Step Action
1 Replace Fusing Unit.
2 Replace PWB-P.
Description
Relevant Electric Parts
Controller/Mechanical Control Board (PWB-P)
Thermostat (TS1)
Power Unit (PU1)
Ref. Page
Control Signal
–
–
–
–
–
–
Description
Relevant Electric Parts
Controller/Mechanical Control Board (PWB-P)
Ref. Page
Control Signal
–
–
T-15
WIRING DIAGRAM
Location
(Electric Parts)
– –
– –
– –
– –
– –
– –
WIRING DIAGRAM
Location
(Electric Parts)
– –
– –