Brother MFC-9320CW Service Manual page 151

■ Vertical streaks in a light background
<User Check>
- Clean the inside of the machine and the corona wire in the drum unit.
- Clean the LED array with a soft lint-free cloth.
- Replace the toner cartridge with a new one.
- Replace the drum unit with a new one.
Memo:
You can check this image defect with the function code 71.
(Refer to "1.4.21 Color test pattern (Function code 71)" in Chapter
Step Cause
1 LED ASSY failure
■ Vertical streaks in a dark background
<User Check>
- Clean the inside of the machine and the corona wire in the drum unit.
- Clean the LED array with a soft lint-free cloth.
- Replace the toner cartridge with a new one.
Step Cause
1 LED ASSY failure
Check
Is the problem solved
after replacing the LED
ASSY?
Check
Is the problem solved
after replacing the LED
ASSY?
3-70
7)
Remedy
Result
Yes Replace the LED ASSY.
Remedy
Result
Yes Replace the LED ASSY.
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