Samsung SCX-5315F Series Service Manual page 37

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 is correctly
installed.
• Check that the TWAIN driver is installed.
• Check the printer port (Parallel) BIOS set-
tings.
• Check harness contact.
• Check the IEEE1284 signal levels.
• 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
• Use standard 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, ensure
ECP is selected.
• Check CN12 contact in Main PBA
• If any signal level is defective, replace
driver PBA.
- U33-26, 27, 28, 43, 44, 45, 46, 47 on Main
PBA are 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.
- U2-4, 11, 18, 25 = 0V to 24V swing signal
when operating.
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