Canon CanoScan N656U Service Manual - Page 74

Error Message, Faulty main PCB.

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CHAPTER 5 4. Error Message Causes and corrective actions for error messages which may occur during Canon Scanner Test are described below. 1) When Canon Scanner Test is started, "Unable to find USB scanner" is displayed. Cause 1 : Device driver for the scanner is not installed in the host computer. Corrective action : Install the device driver. Cause 2 : Scanner is not detected by the host computer. Corrective action : Properly detect the scanner by the host computer. 2) Scanner Information is not displayed or Scanner Self Test terminates without scan operation. Cause 1 : Carriage lock is locked. Corrective action : Unlock the carriage lock. Cause 2 : Scanner is not detected by the host computer. Corrective action : Properly detect the scanner by the host computer. Cause 3 : Faulty flat cable. Corrective Action : Check the flat cable connector. If it is normal, replace the flat cable. Cause 4 : Faulty contact image sensor. Corrective Action : Replace the contact image sensor. Cause 5 : Faulty main PCB. Corrective Action : Replace the drive unit. 3) "Carriage lock is locked" is displayed. Cause 1 : Carriage lock is locked. Corrective Action : Unlock the carriage lock. Cause 2 : Faulty drive motor/faulty home position sensor. Corrective Action : Replace the drive Unit. 4) "Unable to open file" is displayed. Cause : Canon Scanner Test is started from a CD-ROM or write-protect HDD. Corrective Action : Copy the Canon Scanner Test on a writable HDD to use. COPYRIGHT © 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON) 5 - 15

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CHAPTER 5
5 - 15
COPYRIGHT
2000 CANON INC.
CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
4. Error Message
Causes and corrective actions for error messages which may occur during Canon Scanner
Test are described below.
1) When Canon Scanner Test is started, "Unable to find USB scanner" is displayed.
Cause 1
:
Device driver for the scanner is not installed in the host computer.
Corrective action
:
Install the device driver.
Cause 2
:
Scanner is not detected by the host computer.
Corrective action
:
Properly detect the scanner by the host computer.
2) Scanner Information is not displayed or Scanner Self Test terminates without scan
operation.
Cause 1
:
Carriage lock is locked.
Corrective action
:
Unlock the carriage lock.
Cause 2
:
Scanner is not detected by the host computer.
Corrective action
:
Properly detect the scanner by the host computer.
Cause 3
:
Faulty flat cable.
Corrective Action :
Check the flat cable connector.
If it is normal, replace the flat cable.
Cause 4
:
Faulty contact image sensor.
Corrective Action :
Replace the contact image sensor.
Cause 5
:
Faulty main PCB.
Corrective Action :
Replace the drive unit.
3) "Carriage lock is locked" is displayed.
Cause 1
:
Carriage lock is locked.
Corrective Action :
Unlock the carriage lock.
Cause 2
:
Faulty drive motor/faulty home position sensor.
Corrective Action :
Replace the drive Unit.
4) "Unable to open file" is displayed.
Cause
:
Canon Scanner Test is started from a CD-ROM or write-protect HDD.
Corrective Action :
Copy the Canon Scanner Test on a writable HDD to use.