Brother 1250, HL-1030, 1240 service manual Black spots, Black band

CHAPTER 6 TROUBLESHOOTING

I-16

Black spots

User Check

(1)If the problem is not solved after printing a few pages, the drum unit may have glue from label stock on the photosensitive drum surface. Refer to Step 1 in the table below and NOTE in the previous page.

(2)The drum unit may be damaged. Install a new drum unit.

Possible cause	Step	Check	Result		Remedy
Drum unit	1	Are the spots at 94mm	Yes	1)	If toner or glue remains
		intervals?			stuck, wipe it off gently with a
		(The problem is not solved			cotton swab. (Refer to NOTE
		after printing a few pages.)			in the previous page.)
				2)	If the photosensitive drum is
					scratched or deteriorated
					(exposed), replace the drum
					unit.
Fixing unit	2	Are the spots at 79mm	Yes	1)	Check and clean the heat
		intervals?			roller with a cloth dampened
		(The problem is not solved			with alcohol.
		after printing a few pages.)		2)	Replace the fixing unit.
High-voltage	3	Is the problem solved after	Yes	Replace the high-voltage power
power supply		replacing the high-voltage		supply PCB.
PCB failure		power supply PCB?

I-17

Black band

Possible cause	Step	Check	Result		Remedy	Ground
						contacts
Corona failure	1	Is the wire cleaner at its home	No	Return the wire
		position?		cleaner to its home		➁
				position.
Corona failure	2	Is the corona wire dirty?	Yes	1)	Clean the corona	➁
					wire.
				2)	If the problem still
					appears after
					cleaning, replace
					the drum unit.

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