Electric Problems; Input - Kyocera TASKalfa 2551ci Service Manual

1-4-4 Electric problems

If the part causing the problem s not designated as a service part, replace with the assembly comprising the
part.
Troubleshooting to each failure must be made in the order of the numbered Problems.
Problem
(1)
The machine does
not operate when
the main power
switch is turned on.
(2)
ISU motor does not
operate.
(3)
Eject motor does
not operate.
Causes
1. No electricity at the
power outlet.
2. The power cord is
not plugged in prop-
erly.
3. Broken power cord.
4. Defective main
power switch.
5. Defective interlock
switch.
6. Defective power
source PWB.
1. Defective connector
cable or poor con-
tact in the connector.
2. Defective drive trans-
mission system.
3. Defective motor.
4. Defective PWB.
1. Defective connector
cable or poor con-
tact in the connector.
2. Defective drive trans-
mission system.
3. Defective motor.
4. Defective PWB.
Check procedures/corrective measures
Measure the input voltage.
Check the contact between the power plug and the outlet.
Check for continuity. If none, replace the cord.
Check for continuity across the contacts. If none, replace
the power switch.
Check for continuity across the contacts of interlock switch.
If none, replace the power source PWB (see page 1-5-44).
Replace the power source PWB (see page 1-5-44).
Reinsert the connector. Also check for continuity within the
connector cable. If none, replace the cable.
ISU motor and ISC PWB (YC5)
ISC PWB and main PWB (YC11)
Check if the rollers and gears rotate smoothly. If not,
grease the bushes and gears. Check for broken gears and
replace if any.
Replace the ISU motor.
Replace the main PWB and check for correct operation
(see page 1-5-37).
Reinsert the connector. Also check for continuity within the
connector cable. If none, replace the cable.
Eject motor and engine PWB (YC21)
Check if the rollers and gears rotate smoothly. If not,
grease the bushes and gears. Check for broken gears and
replace if any.
Replace the eject motor.
Replace the engine PWB and check for correct operation
(see page 1-5-39).
1-4-82
2NP