Electric Problems - Kyocera KM-3050 Service Manual

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Electric problems

Troubleshooting to each failure must be in the order of the numbered symptoms.
Problem
(1)
The machine does
not operate when the
main power switch is
turned on.
(2)
The eject motor does
not operate.
(3)
The scanner motor or
cooling fan motor 1 to
14 does not operate.
(4)
The upper/lower
paper feed clutch,
feed clutch 1/2/3, MP
paper feed clutch,
MP feed clutch, reg-
istration clutch or
duplex feed clutch
does not operate.
(5)
The feedshift sole-
noid or toner feed
solenoid does not
operate.
Causes
1. The power cord is not
plugged in properly.
2. No electricity at the
power outlet.
3. Broken power cord.
4. Defective main power
switch.
5. Defective power source
PWB.
1. Poor contact in the con-
nector terminals.
2. Defective drive transmis-
sion system.
3. Defective eject motor.
4. Defective engine PWB.
1. Poor contact in the con-
nector terminals.
2. Broken motor coil.
1. Broken clutch coil.
2. Poor contact in the con-
nector terminals.
3. Defective engine PWB.
1. Broken solenoid coil.
2. Poor contact in the con-
nector terminals.
3. Defective engine PWB.
Check procedures/corrective measures
Check the contact between the power plug and the outlet.
Measure the input voltage.
Check for continuity. If none, replace the cord.
Check for continuity across the contacts. If none, replace the main
power switch.
With AC present, check for 24 V DC at YC1-7 on the power
source PWB, 5 V DC at YC1-6 and 3.3 V DC at YC1-5. If none,
replace the power source PWB.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Check if the rollers and gears rotate smoothly. If not, grease the
bushings and gears. Check for broken gears and replace if any.
Run maintenance item U030 and check if the eject motor oper-
ates. If not, replace the eject motor.
Run maintenance item U030 and check if the eject motor oper-
ates. If not, replace the engine PWB.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Check for continuity across the coil. If none, replace the motor.
Check for continuity across the coil. If none, replace the clutch.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Run maintenance item U032 and check if following terminals on
the engine PWB goes low. If not, replace the engine PWB.
Upper paper feed clutch: YC14-B1 on the engine PWB
Lower paper feed clutch: YC14-B4 on the engine PWB
Feed clutch 1: YC11-14 on the engine PWB
Feed clutch 2: YC13-A12 on the engine PWB
Feed clutch 3: YC13-A5 on the engine PWB
MP paper feed clutch: YC6-A9 on the engine PWB
MP feed clutch: YC6-A11 on the engine PWB
Registration clutch: YC14-B6 on the engine PWB
Duplex feed clutch: YC10-B2 on the engine PWB
Check for continuity across the coil. If none, replace the solenoid.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Run maintenance item U033 and check if the solenoid operates. If
not, replace the engine PWB.
2GN/2GP/2GR-2
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