Brother DCP-L8400CDN Service Manual page 158

■
Faulty registration
- First side (Document scanner unit)
Step
1 Fine adjustment of scan start
position misalignment
2 First side document scanning
position actuator caught on
some position
3 First side CIS unit failure
4 Main PCB failure
- Second side (ADF unit)
Step
1 Fine adjustment of scan start
position misalignment
2 Second side document
scanning position actuator
caught on some position
3 Second side CIS unit failure
4 Main PCB failure
■
Dark
< User Check >
Step
1 White level calibration data
failure
2 Dirt on the second side
document hold
3 Dirt on the black reference
tape of the document scanner
unit
4 First side or second side CIS
unit failure
5 Main PCB failure
Cause
Cause
- Check whether the setting of the contrast does not become dark.
- Clean the second side document hold.
Cause
2-128
Remedy
Perform the fine adjustment of scan start
position. (Function code
Re-assemble the first side document
scanning position actuator.
Replace the first side CIS unit.
Replace the main PCB ASSY.
Remedy
Perform the fine adjustment of scan start
position. (Function code
Re-assemble the second side document
scanning position actuator.
Replace the second side CIS unit.
Replace the main PCB ASSY.
Remedy
Perform the acquisition of white level data.
(Function code 55)
Clean the second side document hold. Or
replace the ADF unit.
Clean the glass of the black reference tape
part. Or replace the document scanner unit.
Replace the first side or second side CIS
unit.
Replace the main PCB ASSY.
54)
54)
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