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(f TROUBLESHOOTING^)
*When the troubleshooting is required, inspect separately such main parts as the control box, motor, operation panel
box, motor, operation panel box, synchronizer, power switch, machine solenoid and presser foot lifter.
*When the control box is found to be out of order, inspect the control circuit board, power board, treadle unit, and
transformer separately.
* Whatever troubles you encounter, check whether the connectors are secured.
*Pay great attention to the maintenance of the power and control circuit boards because the high voltage is applied.
* Refer to the circuit drawings provided separately to check the quality of the detailed parts (semiconductors) for
maintenance.
Trouble
1. The machine does not run even by stepping
on the treadle while the power switch is ON.
(1) Power indicator lamp (red LED! does
not go ON.
(2) Power indicator lamp (red LED) is ON.
2. The machine stops during operation.
(1) Power indicator lamp (red LED) flickers.
(2) Power indicator lamp (red LED) does
not flickers.
3. The machine starts running just by turning
on the power switch even with the treadle
set in the neutral position.
4. The machine does not run at high speed.
5. The machine does not stop even if the
treadle is returned to the neutral position.
6. Abnormal motor running (variation in rpm)
7. The brake produces abnormal noises during
operation.
8. The operations related to the machine sole¬
noid do not work.
(thread trimming, reverse rotation, thread
wiper, and presser)
9. Abnormality related to automatic backtack-
ing, etc.
10. The machine does not make proper hem
stop, using the sensor.
Check Point
Check the power source voltage.
(Try to plug into another outlet.)
Fuse blown: 3-phase 5 A fuse (2 pcs.)
Single-phase 15 A fuse (1 pc.)
(Replace with new ones.)
Check whether the connectors are secured.
(Check especially the 6P connector of the
motor.)
The machine pulley is so heavy to turn man¬
ually.
[The machine or the motor (brake lining) is
locked. Remove the trouble cause and turn on
the power. Then the machine runs normally.)
Power source voltage drop.
(The motor is not out of order.)
Check whether the high speed volume is not set
at "Low."
(The setting range of the high speed volume is
from 230 spm to the maximum.)
If the machine stops after turning off the power
switch, removing the synchronizer switch, then
turning it on again, the synchronizer is out of
order.
(Use as a clutch motor for a while.)
Adjustment of brake clearance
cuit board.
If the thickness cannot be monitored with the
[ply sensor] LED, or the monitoring is unstable,
adjust by pressing the [ply sensor] key again.
If the [ply sensor] LED does not go on even
after the adjustment above, check the connec¬
tor for the sensor.
Parts to Be Replaced
Ref. Page
Fuse
Control box
Control box
Control box
Power switch
assembly
Control box
Synchronizer
Control box
Motor
P25
Remove washer.
P11
8 A fuse
Control box
Control box
Operation box
P26
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