Service manual

CHAPTER 5
5 - 4
COPYRIGHT  2002 CANON INC. CANOSCAN 8000F REV.0 OCT. 2002 PRINTED IN JAPAN (IMPRIME AU JAPON)
Possible Cause Related Parts
Check Method
Corrective Action
USB cable connection failure
Scanner communication failure
Scanning unit failure
USB cable
Main PCB
Scanning unit
Visual check
Trial replacement
Trial replacement
Connect the USB cable
properly
Replace the main PCB
Replace the scanning unit
III. PROBLEM, CAUSE AND CORRECTIVE ACTION
CanoScan 8000F may have the following five problems.
* Power LED not lighting
* Communication failure
* Scanning unit movement failure
* Poor image quality
* Acoustic noise
A. Power LED Not Lighting
Table 5-1
B. Communication Failure
Table 5-2
Possible Cause
AC adapter is unplugged
from the outlet
AC Adapter cable is
disconnected from the scanner
AC adapter output voltage
failure
Button PCB failure
Main PCB failure
Main PCB connection failure
Related Parts
None
None
AC Adapter
Button PCB
Main PCB
None
Check Method
Visual check
Visual check
Output voltage
(+12V) check
Tester check
Tester check
(+12V, GND)
Visual check
Corrective Action
Plug the AC adapter into
the outlet
Connect the AC adapter cable
to the power connector on the
scanner
Replace the AC adapter
Replace the button PCB
Replace the main PCB
Properly connect the main PCB