41956001TH Rev.6 120 /
Oki Data CONFIDENTIAL
5 Fuser unit error
• Do fuser errors occur right after power ON?
(A)
• Yes Is the heat roller thermister disconnected or generating a short circuit? (See Fig. 5-1)
(Approx. 190k-980kΩ in room temperature of 0-43 degrees Celsius.)
• Yes Replace the fuser unit.
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• No Is the back-up roller thermister disconnected or generating a short circuit? (See Fig. 5-1)
(Approx. 190k-980kΩ in room temperature of 0-43 degrees Celsius.)
• Yes Replace the fuser unit.
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• No
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• No Does a fuser unit error occur approx. three minutes after power ON?
• No Proceed to (A).
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• Is the heater in the fuser unit turned ON? (Is it hot?)
• Yes Replace the engine board.
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• No Replace the fuser unit.
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• No Is AC voltage output between CN1 connector pin 1 and pin 3 in the low-voltage power unit?
• No Replace the low-voltage power unit.
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• Yes Replace the fuser unit.
Figure 5.1
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Back-up roller thermister
Heat roller thermister
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