Service manual

ManualsBrandsSharp ManualsFax MachineUX-B20

UX-B20U/UX-B20C/B25C

3 – 4

5. Overall troubleshooting of Printer

• BOTH CARRIER MOTOR AND FEED MOTOR

ARE NG.

NG

OPEN

REPLACE FU101

OK

FUSE "FU101"

+30V CNHEAD1(8PIN)

CHECK RESISTANCE

BETWEEN +30V AND GND.

SHORT OR NOT

CHECK IC10

REPLACE CONTROL PWB

REPLACE IC10

SHORT

CHECK +30V PATTERN

REPLACE CONTROL PWB

NO

OK

OK

NG

REPLACE FEED MOTOR

OK

CHECK WAVEFORMS IC10 (19,21,25,27PIN)

REPLACE CONTROL PWB

NG

• FEED MOTOR IS NG (CARRIER MOTOR IS

GOOD)

• CARRIER MOTOR IS NG (FEED MOTOR IS

GOOD)

REPLACE CARRIER

OK

CHECK WAVEFORMS IC10 (19,21,25,20PIN)

REPLACE CONTROL PWB

NG