Communication Failure; Problem, Cause And; Corrective Action; Power Led Not Lighting - Canon CANOSCAN D1230 series Service Manual

CHAPTER 5
III. PROBLEM, CAUSE AND CORRECTIVE ACTION
D1230U/D2400U 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
Possible Cause
AC adapter is unplugged
from the outlet
AC Adapter cable is
disconnected from the scanner
AC adapter output voltage

failure

Main PCB failure
Main PCB connection failure
B. Communication Failure
Possible Cause
USB cable connection failure
Scanner communication failure
Scanning unit failure
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COPYRIGHT © 2001 CANON INC. CANOSCAN D1230U/D2400U REV.0 MARCH 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
Related Parts Check Method
None Visual check
Visual check
None
Output voltage
AC Adapter
(+12V) check
Tester check
Main PCB
(+12V, GND)
Visual check
None
Table 5-1
Related Parts
Check Method
Visual check
USB cable
Trial replacement
Main PCB
Scanning unit Trial replacement
Table 5-2

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 main PCB
Properly connect the main PCB

Corrective Action

Connect the USB cable
properly
Replace the main PCB
Replace the scanning unit