2FZ/2F0/2HC-5
1-4-56
1-4-4 Electric problems
Troubleshooting to each failure must be in the order of the numbered symptoms.
Problem Causes Check procedures/corrective measures
(1)
The machine does
not operate when the
main power switch is
turned on.
1. The power cord is not
plugged in properly.
Check the contact between the power plug and the outlet.
2. No electricity at the
power outlet.
Measure the input voltage.
3. Broken power cord. Check for continuity. If none, replace the cord.
4. Defective main power
switch.
Check for continuity across the contacts. If none, replace the main
power switch.
5. Defective power source
PWB.
With AC present, check for 24 V DC at YC8-1 on the power
source PWB, 5 V DC at YC8-3, 9-1 and 3.3 V DC at YC8-6, 9-4. If
none, replace the power source PWB.
(2)
Duplex motor does
not operate.
1. Poor contact in the con-
nector terminals.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
2. Broken the gear. Check visually and replace the gear if necessary.
3. Defective duplex motor. Run maintenance item U030 and check if the duplex motor oper-
ates. If not, replace the duplex motor.
4. Defective feed PWB. Run maintenance item U030 and check if the duplex motor oper-
ates. If not, replace the feed PWB.
5. Defective engine PWB. Run maintenance item U030 and check if the duplex motor oper-
ates. If not, replace the engine PWB.
(3)
Transfer fan motor 1/
2, developing cool-
ing fan motor 1/2/3,
printer cooling fan
motor, rear cooling
fan motor, fuser fan
motor, power source
fan motor or paper
conveying fan motor
1/2/3/4 does not
operate.
1. Broken fan motor coil. Check for continuity across the coil. If none, replace the fan motor.
2. Poor contact in the con-
nector terminals.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
3. Defective fan motor. Run maintenance item U037 and check if the fan motor operates
when the following terminals on the PWB goes low. If not, replace
the corresponding fan motor.
Transfer fan motor 1/2: YC28-B4 or YC28-B6 on the engine PWB
Developing cooling fan motor 1/2/3: YC30-B7, YC30-B9 or YC37-
2 on the engine PWB
Printer cooling fan motor: YC30-B13 on the engine PWB
Rear cooling fan motor: YC34-B12 on the engine PWB
Fuser fan motor: YC27-A3 on the engine PWB
Paper conveying fan motor 1/2/3/4: YC10-7 on the engine PWB
4. Defective engine PWB. Run maintenance item U037 and check if following terminals on
the engine PWB goes low. If not, replace the engine PWB.
Transfer fan motor 1/2: YC28-B4 or YC28-B6 on the engine PWB
Developing cooling fan motor 1/2/3: YC30-B7, YC30-B9 or YC37-
2 on the engine PWB
Printer cooling fan motor: YC30-B13 on the engine PWB
Rear cooling fan motor: YC34-B12 on the engine PWB
Fuser fan motor: YC27-A3 on the engine PWB
Paper conveying fan motor 1/2/3/4: YC10-7 on the engine PWB
5. Defective power source
PWB.
Run maintenance item U037 and check if following terminals on
the power source PWB goes low. If not, replace the power source
PWB.
Power source fan motor: YC14-1 on the power source PWB
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