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 installed. • Check correct installation, and use stan-

dard IEEE1284 cable.

• Check how TWAIN driver is installed. • Remove any other scanner driver.

• Reboot after reinstallation of the TWAIN

driver.

• Check the printer port(Parallel). • 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 harness contact.

• Check CN14 contact in Main PBA

• Check the IEEE1284 signal level. • 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.

• 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.

- U55 or U56-1 = 0V to 24V swing signal

when operating.