HIGHLEAD GC20618 Series, Instruction Manual Parts Catalog

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5
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4
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Adjustment of oiling to rotating hook
5. Cautions on operation
a) When the power is turned on or off, keep
foot away from the pedal.
b) It should be noted that the brake may not
work when the power is interrupted or power
failure occurs during sewing machine operation.
c) Since dust in the control box might cause
malfunction or control troubles, be sure to keep the control box cover close during operation.
d) Do not apply a multimeter to the control circuit for checking; otherwise voltage of multimeter
might damage semiconductor components in the circuit.
OPERATION
1
．
Installation of needles
Note: Before installing the needles, be sure to turn off the power.
2
．
Winding of bobbin thread
Note: When bobbin thread is wound, keep the presser foot lifted.
Adjustment:
Tension of wound thread Slack winding is recommended for polyester thread
and nylon thread.
Conically wound thread Move the thread guide toward smaller diameter of
wound thread layer.
Length of wound thread Loosen the thread length adjusting screw to increase length