Troubleshooting For Image Defects; Defect Examples; Troubleshooting According To Image Defect - Brother HLL3290CDW Service Manual

4.12 Troubleshooting for Image Defects

4.12.1 Defect examples

Light (2-147)
Vertical streaks (2-150)

4.12.2 Troubleshooting according to image defect

■
Light
Step
1
2
3
Faulty registration (2-148)
White streaks
(2-150)
<User Check>
• Check that the contrast setting is not too light.
• Clean the scanner glass or first side/second side scanner glass strip.
• Clean the first side/second side document hold.
Cause
Incorrect white level
correction data
First or second side CIS unit
failure
Main PCB failure
Dark (2-148)
Partially shaded
(2-151)
Fig. 2-24
Execute "Acquire white level data
code 55)".
Replace the first or second side CIS unit.
Replace the main PCB.
2-147
Completely All black (2-149)
blank (2-149)
Fully tinged (2-151)
Remedy
(Function
Confidential