3NB/3ND/3N0/3NK
1-4-28
(9)
DF shift release
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.
DF shift release motor and DF main PWB (YC14)
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 DF shift release motor.
4. Defective PWB.
Replace the DF main PWB and check for correct operation.
(see page 1-5-2)
(10)
DF shift motor 1,2
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.
DF shift motor 1,2 and DF main PWB (YC14)
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 DF shift motor 1,2.
4. Defective PWB.
Replace the bridge PWB and check for correct operation.
(see page 1-5-2)
(11)
DF staple 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.
DF staple motor and DF main PWB (YC17)
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 DF staple unit.(see page 1-5-4)
4. Defective PWB.
Replace the DF main PWB and check for correct operation.
(see page 1-5-2)
(12)
DF slide 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.
DF slide motor and DF main PWB (YC12)
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 DF slide motor
4. Defective PWB.
Replace the DF main PWB and check for correct operation.
(see page 1-5-2)
(13)
DF feedshift sole-
noid 1,2,3 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.
DF feedshift solenoid 1,2,3 and DF main PWB (YC18)
2. Defective solenoid.
Replace the DF feedshift solenoid 1,2,3.
3. Defective PWB.
Replace the DF main PWB and check for correct operation
(see page 1-5-2).
Problem
Causes
Check procedures/corrective measures
Y113480-7
Sevice Manual
Summary of Contents for DF-790
Page 1: ...SERVICE MANUAL Options DF 790 BF 730 MT 730 AK 730 PH 7C Code Y113480 7...
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Page 32: ...3NB 3ND 3N0 3NK 1 2 14 3 Remove tape and pad Figure 1 2 18 Tape Pad Service Manual Y113480 7...
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