Service manual

Troubleshooting

Samsung Electronics 4-15

4-6 Troubleshooting

4-6-1 Scanner

4-6-1-1 COPY

PROBLEM ITEMS TO BE CHECKED. HOW TO SOLVE

White copy • Ensure the Scanner cover is closed. • Room lighting can penetrate thin paper

causing quality problems

• Check shading proﬁle • Carry out the “Adjust Shading” procedure

in Tech mode

Black copy • Check the CCD problem in Main PBA. • Check the CCD harness contact.

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

Defective image quality • Check shading proﬁle. • Carry out the “Adjust Shading” procedure

in Tech mode

• Check the original is laying ﬂat on the scan-

ner glass.

• A gap above 0.5mm can cause a blurred

image.

• Check printing quality. • See “Print” troubleshooting.

Abnormal noise • Check the Scanner drive mechanism. • Check scanner carriage, motor, gearbox,

belt and belt tension spring

• Check the Motor Driver chip on the driver

PBA.

• If any driver is defective, replace it. - U2-4,

11, 18, 25 signals swing between OV and

24V when operating.