Commodore MPS-801 - Page 17

TROUBLESHOOTING GUIDE (Continued)
SYMPTOM 6. Improper paper feeding.
POSSIBLE CAUSE SOLUTIONS
1.
LF motor is defective.
To check LF motor, remove cable at con-
nector CN 4. Using pin 4 as a reference
point, take an
ohmmeter reading at pins
5
through 8. Approximately 80 ohms
resistance should be present at each pin.
2.
Control PCB is defective.
Check signals LF1 - LF4 and repair.
SYMPTOM 7. Self test does not work.
POSSIBLE CAUSE
SOLUTIONS
1 .
Dot sensor is bad. Replace it or repair control PCB.
2.
Home sensor is bad.
Replace
it or repair control PCB.
3. Connections to PCB are defective or Replace or repair connections.
loose.
NOTE: It is good practice to check motors and solenoid before replacing PCB. This procedure will
avoid damaging a good board.
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