Brother BAS-342G Instruction Manual download pdf (Page 64)

11. STANDARD ADJUSTMENTS

BAS-342G

11. STANDARD ADJUSTMENTS

CAUTION

Maintenance and inspection of the sewing machine

should only be carried out by a qualified technician.

Ask your Brother dealer or a qualified electrician to

carry out any maintenance and inspection of the

electrical system.

Turn off the power switch and disconnect the power

cord before carrying out the following operations.

If the foot switch is depressed by mistake, the sewing

machine might start operating and injury could result.

• Inspection, adjustment and maintenance

• Replacing consumable parts such as the rotary

hook

Disconnect the air hoses from the air supply and wait

for the needle on the pressure gauge to drop to “0”

before carrying out inspection, adjustment and repair

of any parts which use the pneumatic equipment.

If the power switch and air need to be left on when

carrying out some adjustment, be extremely careful

to observe all safety precautions.

Hold the machine head with both hands when tilting it

back or returning it to its original position.

In addition, do not subject the machine head to extra

force while it is tilted back. If this is not observed, the

machine head may become unbalanced and fall

down, and serious injury or damage to the sewing

machine may result.

Be sure to wear protective goggles and gloves when

handling the lubricating oil and grease, so that they

do not get into your eyes or onto your skin. If the oil

and grease get into your eyes or onto your skin,

inflammation can result.

Furthermore, do not drink or eat the lubricating oil or

grease. They may cause diarrhea or vomiting.

Keep the oil out of the reach of children.

If any safety devices have been removed, be

absolutely sure to re-install them to their original

positions and check that they operate correctly

before using the machine.

11-1. Adjusting the thread take-up spring

Thread take-up spring height (mm)

7  10

Thread take-up spring tension (N)

0.6  1.2

Loosen the set screw (1) and turn the adjuster to adjust.

1. Press the upper thread slightly above the tension

bracket (2) with a finger to stop the thread spooling out.

2. Pull the upper thread downward so that the thread

take-up spring (3) is extended to the same height as the

base of the thread guide arm (4), and then measure the

tension of the thread take-up spring (3).

3. Use a screwdriver to turn the tension stud (5) in order to

adjust the tension of the thread take-up spring (3).

NOTE:

If the thread tension spring (3) is not adjusted correctly, the upper thread trailing length will be uneven after thread

trimming.

Lower

Higher

4029M

4030M

Weaker

Stronger

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Brother BAS-342G Instruction Manual Page 64

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