Ii. Troubleshooting; Defects - Canon CANOSCAN FB330 series Service Manual

CHAPTER 5

II. TROUBLESHOOTING

Causes and corrective actions for possible image defects and malfunctions during operation
are described below.
A. Troubleshooting Image Defects
1. Image not output
Cause 1 : Faulty connection of the parallel cable/USB cable
Corrective action : Securely connect the parallel cable/USB cable.
Cause 2 : Faulty contact image sensor
Corrective action : Replace the contact image sensor.
Cause 3 : 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 : Perform the calibration.
Cause 3 : External light is entering into the scanner. External light entering into
the contact image sensor 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 contact image sensor
Corrective action : Replace the contact image sensor.
Cause 5 : Faulty main PCB
Corrective action : Replace the main PCB.
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COPYRIGHT © 1999 CANON INC. CANOSCAN FB330/FB630 SERIES REV.0 OCT. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)