Canon canoscan d660u Service Manual
CHAPTER 5
5 - 2
COPYRIGHT ©
2000 CANON INC. CANOSCAN D660U REV.0 JULY 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
II. TROUBLESHOOTING
Causes and corrective actions against possible faulty image and faulty operation are listed
below.
A. Faulty Image
1. Image not output
Cause 1
: Faulty connection of the USB cable
Corrective action : Securely connect the USB cable.
Cause 2
: Faulty scanning lamp when scanning in flatbed mode
Corrective action : Replace the lamp unit.
Cause 3
: Faulty FAU when scanning a film
Corrective action : Replace the document cover.
Cause 4
: Faulty CCD
Corrective action : Replace the scanning unit.
Cause 5
: Faulty main PCB
Corrective action : Replace the main PCB.
2. Uneven image density or lines
Cause 1
: Dirt on the document cover or document glass
Corrective action : Clean the document cover or document glass.
Cause 2
: Faulty calibration data
Corrective action : Scan again.
Cause 3
: External light is entering into the scanner. External light entering into
the CCD can cause uneven image density.
Corrective action : Fully close the document cover. If it is impossible, cover with a sheet etc.
to prevent external light.
Cause 4
: Faulty CCD
Corrective action : Replace the scanning unit.
Cause 5
: Faulty main PCB
Corrective action : Replace the main PCB.