3NL-2
1-4-18
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.
SM main PWB (YC1) and engine PWB(YC19)
(2)
SM 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.
SM paper feed motor and SM main PWB (YC5)
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 SM paper feed motor.
4. Defective PWB.
Replace the SM main PWB and check for correct operation
(see page 1-5-8).
(3)
SM paper feed
clutch 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.
SM paper feed clutch and SM main PWB (YC5)
2. Defective clutch.
Replace the SM paper feed clutch.
3. Defective PWB.
Replace the SM main PWB and check for correct operation
(see page 1-5-8).
(4)
SM paper convey-
ing clutch 1,2,3
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.
SM paper conveying clutch 1,2,3 and SM main PWB (YC9)
2. Defective clutch.
Replace the SM paper conveying clutch 1,2 or 3.
3. Defective PWB.
Replace the SM main PWB and check for correct operation
(see page 1-5-8).
(5)
SM feedshift sole-
noid does not oper-
ate.
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.
SM feedshift solenoid and SM main PWB (YC10)
2. Defective solenoid.
Replace the SM feedshift solenoid.
3. Defective PWB.
Replace the SM main PWB and check for correct operation
(see page 1-5-8).
(6)
The message
requesting paper to
be loaded is shown
when paper is
present on the cas-
sette.
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.
SM paper sensor and SM main PWB(YC7)
2. Deformed actuator.
Check visually and replace if necessary.
3. Defective sensor.
Replace the SM paper sensor.
4. Defective PWB.
Replace the SM main PWB and check for correct operation
(see page 1-5-8).
Summary of Contents for UTAX PF 780
Page 1: ...Service Manual 3DSHU HHGHU 3 3 5HY Date 21 201 1 SM06 ...
Page 2: ...Service Manual 3DSHU HHGHU 3 3 5HY Date 21 201 1 SM06 ...
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Page 16: ...3NL 1 1 3 1 1 3 Machine cross section Figure 1 1 2 Paper path ...
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Page 104: ...1 1 INSTALLATION GUIDE INSTALLATION GUIDE FOR SIDE MULTI TRAY ...