
3NV
1-4-6
(5)
DP switchback
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.
DP switchback motor and DP main PWB (YC14)
2. Defective connector
cable or poor con-
tact in the connector.
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 DP switchback motor.
4. Defective PWB.
Replace the DP main PWB and check for correct operation.
(6)
DP 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.
DP lift motor and DP main PWB (YC5)
2. Defective connector
cable or poor con-
tact in the connector.
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 DP lift motor.
4. Defective PWB.
Replace the DP main PWB and check for correct operation.
(7)
DP switchback
feedshift solenoid
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.
DP switchback feedsift solenoid and DP main PWB (YC9)
2. Defective solenoid
Replace the DP switchback feedsift solenoid.
3. Defective PWB.
Replace the DP main PWB and check for correct operation.
(8)
DP switchback
pressure solenoid
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.
DP switchback pressure solenoid and DP main PWB (YC9)
2. Defective solenoid
Replace the DP switchback pressure solenoid.
3. Defective PWB.
Replace the DP main PWB and check for correct operation.
(9)
An original jams
when the main
power switch is
turned on.
1. A piece of paper torn
from an original is
caught around the
DP feed sensor, DP
registration sensor,
DP timing sensor,
DP switchback
sensor, DP eject
sensor.
Check visually and remove it, if any.
2. Defective sensor.
Replace the DP feed sensor, DP registration sensor, DP
timing sensor, DP switchback sensor or DP eject sensor.
3. Defective PWB.
Replace the DP main PWB and check for correct operation.
Problem
Causes
Check procedures / corrective measures
Содержание DP 770
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