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1-4-3
Electric problems
Troubleshooting to each failure must be in the order of the numbered symptoms.
Problem
(1)
The paper feeder
does not operate
when the main power
switch is turned on.
(2)
The PF drive motor
does not operate.
(3)
The PF paper feed
clutch 1/2 or PF
paper conveying
clutch does not oper-
ate.
(4)
The PF lift motor 1/2
does not operate.
(5)
The size of paper on
the cassette 3 is not
displayed correctly.
(6)
The size of paper on
the cassette 4 is not
displayed correctly.
Y112020-4
Causes
1. Poor contact in the con-
nector terminals.
2. Defective left cover 4
switch.
1. Poor contact in the con-
nector terminals.
2. Broken the gear.
3. Defective PF drive motor. Run maintenance item U247 and check if the PF paper conveying
4. Defective PF main PWB.
1. Broken clutch coil.
2. Poor contact in the con-
nector terminals.
3. Defective PF main PWB.
1. Broken motor coil.
2. Poor contact in the con-
nector terminals.
1. Poor contact in the con-
nector terminals.
2. Defective PF paper size
length switch 1.
3. Defective PF paper size
width switch 1.
1. Poor contact in the con-
nector terminals.
2. Defective PF paper size
length switch 2.
3. Defective PF paper size
width switch 2.
Check procedures/corrective measures
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. If none, replace the left
cover 4 switch.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Check visually and replace the gear if necessary.
motor operates when YC4-3 on the PF main PWB goes low. If not,
replace the PF drive motor.
Run maintenance item U247 and check if YC4-3 on the PF main
PWB goes low. If not, replace the PF main PWB.
Check for continuity across the coil. If none, replace the clutch.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Run maintenance item U247 and check if following terminals on
the PF main PWB goes low. If not, replace the PF main PWB.
PF paper feed clutch 1: YC2-5
PF paper feed clutch 2: YC2-6
PF paper conveying clutch: YC2-4
Check for continuity across the coil. If none, replace the motor.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Check if YC8-3 on the PF main PWB goes low when the PF paper
size length switch 1 is turned on. If not, replace the PF paper size
length switch 1.
Check for continuity between YC3-1, YC3-2, and YC3-3 on the PF
main PWB. If the continuity is unaffected by movement of the
width guides in the cassette 3 (i.e. either remains present or
remains absent), then replace the PF paper size width switch 1.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Check if YC8-1 on the PF main PWB goes low when the PF paper
size length switch 2 is turned on. If not, replace the PF paper size
length switch 2.
Check for continuity between YC3-11, YC3-12, and YC3-13 on
the PF main PWB. If the continuity is unaffected by movement of
the width guides in the cassette 4 (i.e. either remains present or
remains absent), then replace the PF paper size width switch 2.
Service Manual
3LM
1-4-7
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