2KA
1-4-61
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 YC7-1, YC7-2 and 5 V DC
at YC7-6 on the power source PWB. If none, replace the power
source PWB.
(2)
Registration motor or
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. Defective drive transmis-
sion system.
Check if the rollers and gears rotate smoothly. If not, grease the
bushings and gears. Check for broken gears and replace if any.
3. Defective motor. Run maintenance item U030 and check if the motor operates. If
not, replace the motor.
4. Defective feed PWB. Run maintenance item U030 and check if the motor operates. If
not, replace the feed PWB.
5. Defective engine PWB. Run maintenance item U030 and check if the motor operates. If
not, replace the engine PWB.
(3)
Toner container
motor does not oper-
ate.
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. Defective drive transmis-
sion system.
Check if the rollers and gears rotate smoothly. If not, grease the
bushings and gears. Check for broken gears and replace if any.
3. Defective motor. Run maintenance item U135 and check if the motor operates. If
not, replace the motor.
4. Defective engine PWB. Run maintenance item U135 and check if the motor operates. If
not, replace the engine PWB.
(4)
Front fan motor or
container fan motor
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.
Front fan motor: YC2-1 on the main front PWB
Container fan motor: YC7-2 on the main front PWB
4. Defective 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
5. Defective engine 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