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8. STANDARD ADJUSTMENTS
,
A
CAUTION
A·
8. STANDARD
ADJUSTMENTS
~.
Maintenance and inspection of the sewing
machine should only be carried out by
qualified personnel.
Ask your SEIKO dealer or a qualified elec-
trician to carry out any maintenance and
inspection of the electrical system.
If any safety devices have been removed,
be absolutely sure to re-install them to their
original positions and check that they op-
erate correctly before using the machine.
Turn off the power switch and disconnect
the power cord from the wall outlet at the
following
times, otherwise the machine
may operate if the treadle is pressed by
mistake, which could result in injury.
However, the motor will keep turning even
after the power is switched off as a result
of the motor's inertia. Wait until the motor
stops fully before starting work.
• When carrying out inspection, adjust-
ment and maintenance
• When replacing consumable parts such
as the rotary hook
A •
If the power switch needs to be left on when
~
carrying
out some adjustment.
be ex-
tremely careful to observe all safety pre-
cautions.
8-1.
Adjusting the thread controller spring
• Operating range of spring
The standard operating range for spring
0
is 5-10mm.
1. Loosen the screw
e.
and then turn the thread con-
troller spring stoP.
to adjust the operating range.
•
For more operating range, move the spring
stoP.
to the right.
•
For less operating range. move the spring stop
• to the left.
2. Tighten the screw
e.
L_'"
o
• Tension of the spring
The standard tension for spring
0
is 0.39-0.78 N (40-
80g).
1. Loosen the tension thumb nut
8
and screw
e.
2. Turn the tension stud.
to adjust the tension.
•
To increase the spring tension, slightly turn the
tension stud.
counterclockwise.
•
To decrease the tension. turn the stud clock-
wise.
3. After adjustment, tighten the tension thumb nut
8
and screw
0.
- 14 -
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