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41388601TH Rev.2 115 /
5 Fuser Unit Error
• Does the fuser error occur immediately after the printer is turned on?
• Yes Does the heat roller thermistor have a open or short circuit? (See Figure 6.1.)
(at room temperature 0 °C~ 43 °C, approx. 190 ~ 980 Ω)
Yes Replace the fuser unit.
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• No Does the back-up roller thermistor have a open or short circuit? (See Figure 6.1.)
(at room temperature 0 °C~ 43 °C, approx. 190 ~ 980 Ω)
Yes Replace the fuser unit.
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• No
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• No Does the fuser error occur about 3 min. after the printer is turned on?
• No Go to .
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• Yes Is the fuser’s heater on? (Does it get hot?)
• Yes Replace the engine board.
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• No Replace the fuser unit.
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• No Does AC voltage appear between CN1 connector Pin 1 and Pin3 of the low-voltage power
supply unit?
No Replace the low-voltage power supply unit.
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• Yes Replace the fuser unit.
Figure 6.1
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A
A
Halogen Lamp
Back-up Roller Thermistor
Heat Roller Thermistor
Bottom part of Fuser Unit