Electric Problems - Kyocera TASKalfa 620 Service Manual

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Electric problems

Troubleshooting to each failure must be in the order of the numbered symptoms.
Body
Problem
(1)
The machine does
not operate when the
main power switch is
turned on.
(2)
The developing
motor does not oper-
ate
(C2100).
(3)
The drive motor does
not operate
(C2200).
(4)
The fuser motor does
not operate
(C2300).
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. Blown fuse in the AC
power source PWB.
1. Poor contact in the devel-
oping motor connector
terminals.
2. Defective drive transmis-
sion system.
3. Defective duplex PWB.
4. Defective developing
motor.
1. Poor contact in the drive
motor connector termi-
nals.
2. Defective drive transmis-
sion system.
3. Defective engine PWB.
4. Defective deck PWB.
5. Defective drive motor.
1. Poor contact in the fuser
motor connector termi-
nals.
2. Defective drive transmis-
sion system.
3. Defective engine PWB.
4. Defective duplex PWB.
5. Defective fuser motor.
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.
Check for continuity. If none, remove the cause of blowing and
replace the fuse.
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 YC8-3 (remote siginal)
on the duplex PWB goes low. If not, replace the duplex PWB.
Run maintenance item U030 and check if the developing motor
operates when YC8-3 (remote siginal) on the duplex PWB goes
low. If not, replace the developing motor.
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 YC3-B4 (remote siginal)
on the engine PWB goes low. If not, replace the engine PWB.
Run maintenance item U030 and check if YC11-3 (remote siginal)
on the deck PWB goes low. If not, replace the deck PWB.
Run maintenance item U030 and check if the drive motor oper-
ates when YC11-3 (remote siginal) on the deck PWB goes low. If
not, replace the drive motor.
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 YC2-B11 (remote sigi-
nal) on the engine PWB goes low. If not, replace the engine PWB.
Run maintenance item U030 and check if YC4-3 (remote siginal)
on the duplex PWB goes low. If not, replace the duplex PWB.
Run maintenance item U030 and check if the fuser motor oper-
ates when YC4-3 (remote siginal) on the duplex PWB goes low. If
not, replace the fuser motor.
2KN/2KP
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