Electric Problems - Olivetti DF-790 Service Manual

1-4-3 Electric problems

If the part causing the problem was not supplied, use the unit including the part for replacement.
Troubleshooting to each failure must be in the order of the numbered symptoms.
Problem
(1)
DF paper entrance
motor does not
operate.
(2)
DF middle motor
does not operate.
(3)
DF paddle motor
does not operate.
(4)
DF eject release
motor does not
operate.
Y113480-7
Causes
1. Defective connector
cable or poor con-
tact in the connector.
2. Defective drive trans-
mission system.
3. Defective motor.
4. Defective PWB.
1. Defective connector
cable or poor con-
tact in the connector.
2. Defective drive trans-
mission system.
3. Defective motor.
4. Defective PWB.
1. Defective connector
cable or poor con-
tact in the connector.
2. Defective drive trans-
mission system.
3. Defective motor.
4. Defective PWB.
1. Defective connector
cable or poor con-
tact in the connector.
2. Defective drive trans-
mission system.
3. Defective motor.
4. Defective PWB.
Check procedures/corrective measures
Reinsert the connector. Also check for continuity within the
connector cable. If none, replace the cable.
DF paper entrance motor and DF main PWB (YC12)
Check if the rollers and gears rotate smoothly. If not,
grease the bushes and gears. Check for broken gears and
replace if any.
Replace the DF paper entrance motor.
Replace the DF main PWB and check for correct operation.
(see page 1-5-2)
Reinsert the connector. Also check for continuity within the
connector cable. If none, replace the cable.
DF middle eject motor and DF main PWB (YC12)
Check if the rollers and gears rotate smoothly. If not,
grease the bushes and gears. Check for broken gears and
replace if any.
Replace the DF middle eject motor.
Replace the DF main PWB and check for correct operation.
(see page 1-5-2)
Reinsert the connector. Also check for continuity within the
connector cable. If none, replace the cable.
DF paddle motor and DF main PWB (YC15)
Check if the rollers and gears rotate smoothly. If not,
grease the bushes and gears. Check for broken gears and
replace if any.
Replace the DF paddle motor.
Replace the DF main PWB and check for correct operation
(see page 1-5-2).
Reinsert the connector. Also check for continuity within the
connector cable. If none, replace the cable.
DF eject release motor and DF main PWB (YC12)
Check if the rollers and gears rotate smoothly. If not,
grease the bushes and gears. Check for broken gears and
replace if any.
Replace the DF eject release motor.
Replace the DF main PWB and check for correct operation.
(see page 1-5-2)
1-4-26
3NB/3ND/3N0/3NK
Sevice Manual