Brother 09055CDN Service Manual page 172

■ Completely blank
<User Check>
Step
1 CIS unit failure
2 Second side scanning CIS
failure
3 Main PCB failure
■ Vertical streaks
Step
1 CIS unit failure
2 Second side scanning CIS
failure
■ White vertical streaks
<User Check>
Step
1 White level data failure
2 CIS unit failure
3 Second side scanning CIS
failure
- Check if the first side and second side of the document are reversed.
Cause
<User Check>
- Check if the ADF glass or document glass is not
stained.
- Clean the CIS glass of the ADF.
Cause
- Check if the ADF glass or document glass is not stained.
- Clean the CIS glass of the ADF.
- Check whether the document hold of the ADF is not dirty. If it is dirty
clean it.
Cause
2-133
Remedy
Replace the document scanner unit.
Replace the second side scanning CIS.
Replace the main PCB ASSY.
Remedy
Replace the document scanner unit.
Replace the second side scanning CIS.
Remedy
Perform the acquisition of white level data.
(Function code 55)
Replace the document scanner unit.
Replace the second side scanning CIS.
Confidential