Electric Problems - Kyocera FS-C8500DN 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)
Registration motor or
duplex motor does
not operate.
(3)
Toner container
motor does not oper-
ate.
(4)
Front fan motor or
container fan motor
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 motor.
4. Defective feed PWB.
5. Defective engine PWB.
1. Poor contact in the con-
nector terminals.
2. Defective drive transmis-
sion system.
3. Defective motor.
4. Defective engine PWB.
1. Broken fan motor coil.
2. Poor contact in the con-
nector terminals.
3. Defective fan motor.
4. Defective main front
PWB.
5. 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 YC7-1, YC7-2 and 5 V DC
at YC7-6 on the power source PWB. 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 motor operates. If
not, replace the motor.
Run maintenance item U030 and check if the motor operates. If
not, replace the feed PWB.
Run maintenance item U030 and check if the motor operates. 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 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 U135 and check if the motor operates. If
not, replace the motor.
Run maintenance item U135 and check if the motor operates. If
not, replace the engine PWB.
Check for continuity across the coil. If none, replace the fan motor.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
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.
Front fan motor: YC2-1 on the main front PWB
Container fan motor: YC7-2 on the main front PWB
Run maintenance item U037 and check if following terminals on
the main front PWB goes low. If not, replace the main front PWB.
Front fan motor: YC2-1 on the main front PWB
Container fan motor: YC7-2 on the main front PWB
Run maintenance item U037 and check if following terminals on
the engine PWB goes low. If not, replace the engine PWB.
Front fan motor: YC18-A8 on the engine PWB
Container fan motor: YC18-B1 on the engine PWB
2KA
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