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41388601TH Rev.2 123 /
6 Poor fusing (Images are blurred or peeled off when touched with a hand.)
• Is the specified paper used?
No Use the proper paper.
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• Yes Is the contact of the fuser unit connected correctly?
No Connect the contact of the fuser unit properly.
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• Yes Are the rollers in the fuser unit contaminated?
Yes Replace the fuser unit.
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• No Is the “MEDIA TYPE” (MENU 1) set correctly?.
Light: 60 g/sq.m. Med. light: 64~74 g/sq.m. Medium: 75~90 g/sq.m.
Med. heavy: 91~104 g/sq.m. Heavy: 105~122 g/sq.m. Ultra heavy: 123~175 g/sq.m.
No Set the proper “MEDIA TYPE”.
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• Yes Does AC voltage appear between the CN connector Pin 1 and Pin 3 of the low-voltage power
supply unit?
No Replace the low-voltage power supply unit.
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• Yes Is the resistance of the heat roller thermistor within the rated value? (See the Figure 6.1.)
(at room temperature 0 °C~ 43 °C, approx. 190 ~ 980 Ω)
No Replace the fuser unit.
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• Yes Is the resistance of the back-up roller thermistor within the rated value? (See the Figure 6.1.)
(at room temperature 0 °C~ 43 °C, approx. 190 ~ 980 Ω)
No Replace the fuser unit.
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• Yes Is the THERM1 signal on the THERM connector Pin 6 on the engine board (K73 PWB) within
the range below?
No Replace the fuser unit assy.
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• Yes Replace the fuser unit assy.
Notes: 1. When replacing the engine board (K73 PWB), demount the EEPROM chip from the old
engine board and remount it on the new one.
2. In case the EEPROM chip is not replaced, see Item (2) in Sec. 6.5.2.