Xerox WorkCentre Pro 412 Service Manual page 93

7-3-2 PC-Scan
PROBLEM
Scanning error
Defective image
quality
Abnormal noise
WorkCentre Pro 412
Launch Issue
ITEMS TO BE CHECKED.
• Check the printer cable.
• Check how TWAIN driver is
installed.
• Check harness contact.
• Check the IEEE1284 signal
level.
• Check shading profile.
• Check the gap between original
and scanner glass.
• Check the scanner glass and
any mechanical disturbance.
• Check the motor driver in Driver
PBA.
August 2001
Maintenance & Troubleshooting
HOW TO SOLVE
• Check correct installation, and
use standard IEEE1284 cable.
• Remove any other scanner
driver.
• Reboot after reinstallation of
the TWAIN driver.
• Check CN14 contact in Main
PBA
• If any signal level is defective,
install a new Main PBA.
- U36-66~74 in Main PBA = 0.8V
to 2.4V TTL signal.
• If necessary, install a new PBA
MAIN MAIN, PL 1-19
• Remake shading profile in the
Tech mode.
• A gap greater than 0.5mm can
cause a blurred image.
• Check the scanner glass is cor-
rectly located and clean, check
that the CCD carriage moves
smoothly.
• If any driver is defective,
replace the Main PBA.
- U55 or U56-19 = 0V to 24V
swing signal when operating.
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