3NC/3NB/3NK
1-4-21
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
Causes
Check procedures/corrective measures
(1)
DF middle motor
motor does not
operate.
1. Defective connector
cable or poor con-
tact in the connector.
Reinsert the connector. Also check for continuity within the
connector cable. If none, replace the cable.
DF middle motor and DF main PWB (YC10)
2. Defective drive trans-
mission system.
Check if the rollers and gears rotate smoothly. If not,
grease the bushes and gears. Check for broken gears and
replace if any.
3. Defective motor.
Replace the DF middle motor.
4. Defective PWB.
Replace the DF main PWB and check for correct operation
(see page 1-5-4).
(2)
DF middle eject
motor motor does
not operate.
1. Defective connector
cable or poor con-
tact in the connector.
Reinsert the connector. Also check for continuity within the
connector cable. If none, replace the cable.
DF middle eject motor and DF main PWB (YC10)
2. Defective drive trans-
mission system.
Check if the rollers and gears rotate smoothly. If not,
grease the bushes and gears. Check for broken gears and
replace if any.
3. Defective motor.
Replace the DF middle eject motor.
4. Defective PWB.
Replace the DF main PWB and check for correct operation
(see page 1-5-4).
(3)
DF paddle motor
does not operate.
1. Defective connector
cable or poor con-
tact in the connector.
Reinsert the connector. Also check for continuity within the
connector cable. If none, replace the cable.
DF paddle motor and DF main PWB (YC10)
2. Defective drive trans-
mission system.
Check if the rollers and gears rotate smoothly. If not,
grease the bushes and gears. Check for broken gears and
replace if any.
3. Defective motor.
Replace the DF paddle motor.
4. Defective PWB.
Replace the DF main PWB and check for correct operation
(see page 1-5-4).
(4)
DF eject release
motor does not
operate.
1. Defective connector
cable or poor con-
tact in the connector.
Reinsert the connector. Also check for continuity within the
connector cable. If none, replace the cable.
DF eject release motor and DF main PWB (YC10)
2. Defective drive trans-
mission system.
Check if the rollers and gears rotate smoothly. If not,
grease the bushes and gears. Check for broken gears and
replace if any.
3. Defective motor.
Replace the DF eject release motor.
4. Defective PWB.
Replace the DF main PWB and check for correct operation
(see page 1-5-4).
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Summary of Contents for PH-7A
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