Acoustic Noise; Scanning Unit Movement Failure; Poor Image Quality - Canon CanoScan 9900F Service Manual

C. Scanning Unit Movement Failure
Possible Cause
Drive belt broken or worn
Gears broken or worn
Scanner button failure
Drive motor failure
D. Poor Image Quality
Possible Cause
Scanning lamp does not light
or blinks
Dirt on document glass
Main PCB failure
CCD PCB failure
E. Acoustic Noise
Possible Cause
Motor unit failure
Main PCB failure
Scanning unit failure
Dirt on sliding rod
Reference sheet is
improperly positioned
COPYRIGHT 2003 CANON INC. CANOSCAN 9900F REV.0 FEB. 2003 PRINTED IN JAPAN (IMPRIME AU JAPON)
Related Parts Check Method
Drive belt Trial replacement
Trial replacement
Pulley Unit
Trial replacement
Button PCB
Trial replacement
Motor unit
Table 5-3
Related Parts
Check Method
Scanning unit
Visual check
Document glass
Visual check
Main PCB
Trial replacement
Scanning unit
Trial replacement
Table 5-4
Related Parts Check Method
Motor unirt
Trial replacement
Main PCB
Trial replacement
Scanning unit
Trial replacement
None
Visual check
Document glass
Trial replacement
unit
Table 5-5
CHAPTER 5
Corrective Action
Replace the drive belt
Replace the pulley unit
Replace the button PCB
Replace the motor unit
Corrective Action
Replace the scanning unit
Clean the document glass
Replace the main PCB
Replace the scanning unit
Corrective Action
Replace the motor unit
Replace the main PCB
Replace the scanning unit
Clean the sliding rod
Replace the document glass
unit
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