Canon CanoScan 9900F Service Manual download pdf (Page 68)

CHAPTER 5

5 - 5

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2003 CANON INC. CANOSCAN 9900F REV.0 FEB. 2003 PRINTED IN JAPAN (IMPRIME AU JAPON)

Possible Cause Related Parts Check Method Corrective Action

Drive belt broken or worn

Gears broken or worn

Scanner button failure

Drive motor failure

Drive belt

Pulley Unit

Button PCB

Motor unit

Trial replacement

Replace the drive belt

Replace the pulley unit

Replace the button PCB

Replace the motor unit

Possible Cause Related Parts Check Method Corrective Action

Motor unit failure

Main PCB failure

Scanning unit failure

Dirt on sliding rod

Reference sheet is

improperly positioned

Motor unirt

Main PCB

Scanning unit

None

Document glass

unit

Trial replacement

Visual check

Trial replacement

Replace the motor unit

Replace the main PCB

Replace the scanning unit

Clean the sliding rod

Replace the document glass

unit

C. Scanning Unit Movement Failure

Table 5-3

D. Poor Image Quality

Table 5-4

E. Acoustic Noise

Table 5-5

Possible Cause

Related Parts

Check Method Corrective Action

Scanning lamp does not light

or blinks

Dirt on document glass

Main PCB failure

CCD PCB failure

Scanning unit

Document glass

Main PCB

Scanning unit

Visual check

Trial replacement

Replace the scanning unit

Clean the document glass

Replace the main PCB

Replace the scanning unit

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Canon CanoScan 9900F Service Manual Page 68

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