Samsung SCX-5312F Service Manual page 47

Troubleshooting
4-6-1-2 PC-Scan
PROBLEM
Scanning Error
Defective image
Quality
Abnormal noise
4-16
ITEMS TO BE CHECKED.
• Check the printer cable installed.
• Check how TWAIN driver is installed.
• Check the printer port(Parallel).
• Check harness contact.
.
• Check the IEEE1284 signal level.
• Check the USB signal level.
• Check shading profile.
• Check the gap between original and scan-
ner glass.
• Check the Scanner Motor and any
mechanical disturbance.
• Check the motor driver in Driver PBA.
HOW TO SOLVE
• Check correct installation, and use stan-
dard IEEE1284 cable.
• Remove any other scanner driver.
• Reboot after reinstallation of the TWAIN
driver.
• Check the parallel-port-related items in the
CMOS Setup.
As a printer port, Select ECP among
SPP(Normal), ECP, and EPP
modes(increase print-ing speed)
• Check CN14 contact in Main PBA
• If any signal level is defective, replace
Driver PBA.
- U36-66~74 in Main PBA = 0.8V to 2.4V
TTL signal.
• Otherwise, replace Main PBA.
• If USB signal level is defective, replace
Main PBA.
• Remake shading profile in the tech mode.
• The gap above 0.5mm can cause a
blurred image.
• Check the right position of the Scanner
Motor, and check the any mechanical dis-
turbance in the CCD carriaging part.
• If any driver is defective, replace it.
- U55 or U56-1 = 0V to 24V swing signal
when operating.
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