Brother IntelliFax-4750 Service Manual page 202

Trouble
(15) Dirt back of paper
(16) Poor fixing
(17) Ghost
(18) Black spots
(19) Light rain
At the printer side
Clean the pressure roller in the heat-fixing unit. Replace the
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heat-fixing unit.
Replace the drum unit.
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Replace the high-voltage power supply PCB.
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At the printer side
Instruct the user to use paper of the recommended weight
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2
(less than 36 lb./m
Clean the toner sensors (LED and light-receiver).
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Replace the toner cartridge.
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Replace the drum unit.
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Check the fitting of the heater thermistor. Replace the heat-
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fixing unit.
Replace the low-voltage power supply PCB.
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At the printer side
Instruct the user to use paper of the recommended weight
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2
(less than 36 lb./m
Replace the drum unit.
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Replace the high-voltage power supply PCB.
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At the printer side
Gently wipe off the surface of the photo-sensitive drum with
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a cotton swab.
Replace the drum unit.
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Replace the heat-fixing unit.
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Replace the high-voltage power supply PCB.
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At the printer side
Replace the drum unit.
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Replace the high-voltage power supply PCB.
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VI - 25
Action to be taken
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