Electric Problems - Kyocera FS-720 Service Manual

2GL/2FV/2FW

1-5-3 Electric problems

Problem
(1)
The machine does
not operate when the
power switch is
turned on.
(2)
The main motor does
not operate
(Self diagnostic code
2000).
(3)
The cooling fan
motor does not oper-
ate.
(4)
The registration
clutch does not oper-
ate.
1-5-14
Causes
No electricity at the power
outlet.
The power cord is not
plugged in properly.
The top cover is not closed
completely.
Broken power cord.
Defective power switch.
Blown fuse in the power
source PWB.
Defective interlock switch.
Defective power source
PWB or engine/high voltage
PWB.
Poor contact in the main
motor connector terminals.
Broken main motor gear.
Defective main motor.
Defective engine/high volt-
age PWB.
Broken cooling fan motor
coil.
Poor contact in cooling fan
motor connector terminals.
Broken registration clutch
coil.
Poor contact in the registra-
tion clutch connector termi-
nals.
Defective harness between
connect PWB and engine/
high voltage PWB.
Defective engine/high volt-
age PWB.
Defective connect PWB.
Check procedures/corrective measures
Measure the input voltage.
Check the contact between the power plug and the outlet.
Check the top cover.
Check for continuity. If none, replace the cord.
Check for continuity across the contacts. If none, replace the
power source PWB. See page 1-6-17.
Check for continuity. If none, remove the cause of blowing and
replace the fuse.
Check for continuity across the contacts of interlock switch. If
none, replace the engine/high voltage PWB. See page 1-6-17.
With AC present, check for 5 V DC at YC4-11, YC7-2, YC10-1,
YC6-1, and 24 V DC at YCYC3-5, YC3-6, YC5-1 YC9-1 on the
engine/high voltage PWB. If none, replace the power source PWB
or engine/high voltage PWB. See page 1-6-17.
Reinsert the connector. Also check for continuity within the con-
nector harness. If none, remedy or replace the harness.
Check visually and replace the main motor if necessary.
Replace the main motor. See page 1-6-24.
Replace the engine/high voltage PWB. See page 1-6-17.
Check for continuity across the coil. If none, replace the cooling
fan motor.
Reinsert the connector.
Check for continuity across the coil. If none, replace the registra-
tion clutch.
Reinsert the connector.
Check for continuity across the harness. If none, replace the char-
ness.
Replace the engine/high voltage PWB. See page 1-6-17.
Replace the connect PWB.