Canon CanoScan N656U Service Manual - Page 62

B. Troubleshooting Malfunctions - scanner driver

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CHAPTER 5 B. Troubleshooting Malfunctions 1. Host computer not detecting the scanner Cause 1 : Faulty installation of the device driver Corrective action : Uninstall the device driver and reinstall it. Cause 2 : Faulty connection of the USB cable Corrective action : Securely connect the USB cable to the scanner and host computer. Cause 3 : Faulty main PCB Corrective action : Replace the drive unit. 2. Scanner not operating Cause 1 : Carriage lock is locked. Corrective action : Unlock the carriage lock. Cause 2 : Faulty connection of the flat cable Corrective action : Securely connect the flat cable to the contact image sensor and main PCB. Cause 3 : Faulty contact image sensor Corrective action : Replace the contact image sensor. Cause 4 : Faulty main PCB Corrective action : Replace the drive unit. 3. Drive motor not running Cause 1 : Faulty connection of the connector J2 Corrective action : Securely connect the connector J2. Cause 2 : Faulty drive motor Corrective action : Replace the drive unit. Cause 3 : Faulty main PCB Corrective action : Replace the drive unit. 4. LED of the contact image sensor not lighting Cause 1 : Faulty connection of the connector Corrective action : Securely connect the flat cable. Cause 2 : Faulty contact image sensor Corrective action : Replace the contact image sensor. COPYRIGHT © 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON) 5 - 3

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CHAPTER 5
5 - 3
COPYRIGHT
2000 CANON INC.
CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
B. Troubleshooting Malfunctions
1. Host computer not detecting the scanner
Cause 1
:
Faulty installation of the device driver
Corrective action
:
Uninstall the device driver and reinstall it.
Cause 2
:
Faulty connection of the USB cable
Corrective action
:
Securely connect the USB cable to the scanner and host computer.
Cause 3
:
Faulty main PCB
Corrective action
:
Replace the drive unit.
2. Scanner not operating
Cause 1
:
Carriage lock is locked.
Corrective action
:
Unlock the carriage lock.
Cause 2
:
Faulty connection of the flat cable
Corrective action
:
Securely connect the flat cable to the contact image sensor and main
PCB.
Cause 3
:
Faulty contact image sensor
Corrective action :
Replace the contact image sensor.
Cause 4
:
Faulty main PCB
Corrective action
:
Replace the drive unit.
3. Drive motor not running
Cause 1
:
Faulty connection of the connector J2
Corrective action
:
Securely connect the connector J2.
Cause 2
:
Faulty drive motor
Corrective action
:
Replace the drive unit.
Cause 3
:
Faulty main PCB
Corrective action
:
Replace the drive unit.
4. LED of the contact image sensor not lighting
Cause 1
:
Faulty connection of the connector
Corrective action
:
Securely connect the flat cable.
Cause 2
:
Faulty contact image sensor
Corrective action
:
Replace the contact image sensor.