Electric Problems - Kyocera DP-750 Service Manual

3LL/3LK
1-4-3

Electric problems

Troubleshooting to each failure must be in the order of the numbered symptoms.
Problem
(1)
The original feed
motor, original con-
veying motor, origi-
nal switchback motor
or DP lift motor does
not operate.
(2)
The switchback feed-
shift solenoid or
switchback pressure
solenoid does not
operate.
(3)
A message indicating
cover open is dis-
played when the DP
is closed correctly.
(4)
An original jams
when the main power
switch is turned on.
1-4-10
Causes
1. Poor contact in the con-
nector terminals.
2. Defective drive transmis-
sion system.
3. Defective motor.
4. Defective DP driver
PWB.
1. Poor contact in the con-
nector terminals.
2. Defective solenoid.
3. Defective DP driver
PWB.
1. Poor contact in the con-
nector terminals.
2. Defective DP interlock
switch.
1. A piece of paper torn
from original is caught
around original feed
switch, original registra-
tion switch or DP timing
switch 1/2.
2. Defective switch.
Check procedures/corrective measures
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 U243 and check if the motor operates. If
not, replace the motor.
Run maintenance item U243 and check if the motor operates. If
not, replace the DP driver PWB.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Run maintenance item U243 and check if the solenoid operates. If
not, replace the solenoid.
Run maintenance item U243 and check if the solenoid operates. If
not, replace the DP driver 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 contacts of the switch. If none
when the switch is on, replace DP interlock switch.
Remove any found.
Run maintenance item U244 and turn the switch on and off manu-
ally. Replace the switch if indication of the corresponding switch
on the touch panel is not displayed in reverse.
Original feed switch, original registration switch or DP timing
switch 1/2