2MN/2N1
1-4-92
1-4-4 Electric problems
If the part causing the problem was not supplied, use the unit including the part for replacement.
Troubleshooting to each failure must be in the order of the numbered symptoms.
Problem Causes Check procedures/corrective measures
(1)
The machine does
not operate when
the main power
switch is turned on.
1. No electricity at the
power outlet.
Measure the input voltage.
2. The power cord is
not plugged in prop-
erly.
Check the contact between the power plug and the outlet.
3. Broken power cord. Check for continuity. If none, replace the cord.
4. Defective main
power switch.
Check for continuity across the contacts. If none, replace
the main power switch.
5. Defective power
source PWB.
Replace the power source PWB (see page 1-5-51).
(2)
MP lift motor does
not operate.
1. Defective connector
cable or poor con-
tact in the connector.
Reinsert the connector. Also check for continuity within the
connector cable. If none, replace the cable.
MP lift motor and relay PWB (YC3)
Relay PWB (YC12) and feed PWB 1 (YC17)
Feed PWB 1 (YC1) and engine PWB (YC6)
2. Defective drive trans-
mission system.
Check if the rollers and gears rotate smoothly. If not,
grease the bushes and gears. Check for broken gears and
replace if any.
3. Defective motor. Replace the MP lift motor.
4. Defective PWB. Replace the relay PWB, feed PWB 1 or engine PWB and
check for correct operation (see page 1-5-49).
(3)
Registration motor
does not operate.
1. Defective connector
cable or poor con-
tact in the connector.
Reinsert the connector. Also check for continuity within the
connector cable. If none, replace the cable.
Registration motor and feed PWB 1 (YC25)
Feed PWB 1 (YC2) and engine PWB (YC5)
2. Defective drive trans-
mission system.
Check if the rollers and gears rotate smoothly. If not,
grease the bushes and gears. Check for broken gears and
replace if any.
3. Defective motor. Replace the registration motor.
4. Defective PWB. Replace the feed PWB 1 or engine PWB and check for cor-
rect operation (see page 1-5-49).
(4)
Middle motor does
not operate
.
1. Defective connector
cable or poor con-
tact in the connector.
Reinsert the connector. Also check for continuity within the
connector cable. If none, replace the cable.
Middle motor and feed PWB 2 (YC7)
Feed PWB 2 (YC1) and engine PWB (YC4)
2. Defective drive trans-
mission system.
Check if the rollers and gears rotate smoothly. If not,
grease the bushes and gears. Check for broken gears and
replace if any.
3. Defective motor. Replace the middle motor.
4. Defective PWB. Replace the feed PWB 2 or engine PWB and check for cor-
rect operation (see page 1-5-49).
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