Utax PF 730, Service Manual

Page: 74 / 118

3NJ-4
1-4-17
1-4-4 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)
The paper feeder
does not operate
when the main
power switch is
turned on. 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.
PF main PWB (YC13) and engine PWB
(2)
PF paper feed
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.
PF paper feed motor and PF main PWB (YC16)
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 PF paper feed motor.
4. Defective PWB. Replace the PF main PWB and check for correct operation
(see page 1-5-9).
(3)
PF lift motor 1,2
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.
PF lift motor 1,2 and PF main PWB (YC7)
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 PF lift motor 1 or 2.
4. Defective PWB. Replace the PF main PWB and check for correct operation
(see page 1-5-9).
(4)
PF paper feed
clutch 1, 2 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.
PF paper feed clutch 1, 2 and PF main PWB (YC15)
2. Defective clutch. Replace the PF paper feed clutch 1 or 2.
3. Defective PWB. Replace the PF main PWB and check for correct operation
(see page 1-5-9).
(5)
PF paper convey-
ing clutch 1,2 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.
PF paper conveying clutch 1,2 and PF main PWB (YC15)
2. Defective clutch. Replace the PF paper conveying clutch 1 or 2.
3. Defective PWB. Replace the PF main PWB and check for correct operation
(see page 1-5-9).