Brother HLL3290CDW Service Manual page 186

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Vertical streaks
Step
1 Dirt inside of scanner glass
Dirt inside of first side/second
2
side scanner glass strip
First or second side CIS unit
3
failure
4 Scratch on scanner glass
Scratch on second side
5
scanner glass strip
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White streaks
<User Check>
Step
1 Dirt inside of scanner glass
Dirt inside of first side/second
2
side scanner glass strip
First or second side CIS unit
3
failure
4 Scratch on scanner glass
Scratch on second side
5
scanner glass strip
<User Check>
• Clean the scanner glass or first side/second side
scanner glass strip.
• Clean the first side/second side document hold.
Cause
• Clean the scanner glass or first side/second side scanner glass strip.
• Clean the first side/second side document hold.
Cause
2-150
Remedy
Clean the inside of the scanner glass.
Clean the inside of the first side/second side
scanner glass strip.
Replace the first or second side CIS unit.
Replace the document scanner unit.
Replace the ADF unit.
Remedy
Clean the inside of the scanner glass.
Clean the inside of the first side/second side
scanner glass strip.
Replace the first or second side CIS unit.
Replace the document scanner unit.
Replace the ADF unit.
Confidential