Service manual

Troubleshooting

4-16

Samsung Electronics

4-6-1-2 PC-Scan

PROBLEM ITEMS TO BE CHECKED. HOW TO SOLVE

Scanning Error • Check the printer cable is correctly

installed.

• Use standard IEEE1284 cable.

• Check that the TWAIN driver is installed. • Remove any other scanner driver.

• Reboot after reinstallation of the TWAIN

driver.

• Check the printer port (Parallel) BIOS set-

tings.

• Check the parallel-port-related items in the

CMOS Setup. As a printer port, ensure

ECP is selected.

• Check harness contact. • Check CN12 contact in Main PBA

• Check the IEEE1284 signal levels. • 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.

• Check the USB signal level. • If USB signal level is defective, replace

Main PBA.

Defective image

Quality

• Check shading proﬁle. • Remake shading proﬁle in the tech mode.

• Check the gap between original and scan-

ner glass.

• The gap above 0.5mm can cause a

blurred image.

Abnormal noise • Check the Scanner Motor and any

mechanical disturbance.

• Check the right position of the Scanner

Motor, and check the any mechanical dis-

turbance in the CCD carriaging part.

• Check the motor driver in Driver PBA. • If any driver is defective, replace it.

- U2-4, 11, 18, 25 = 0V to 24V swing signal

when operating.