Brother PC-3000 Service Manual download pdf (Page 56)

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24. NEEDLE THREADER

(CHECKING THE HOOK IN STANDARD POSITION)

STANDARD

1. The clearance between the top of hook and the top of needle eye is 0 mm.

2. Threading is possible when needle is located higher than 8 mm from the needle plate.

CHECK (refer to illustration)

Case A

Hook position is too high. (Hook hits needle and cannot go through needle eye.)

Case B

Hook position is too low. (Hook goes through needle eye but it catches bottom part of needle eye.)

25. NEEDLE THREADER

(CHECKING THE HOOK POSITION IN VERTICAL DIRECTION)

Case A (Hook point is too high)

1. Remove face plate and loosen the screw.

2. Adjust needle threader position setter slightly down and

check that the clearance between the top of hook

and top of needle eye is 0 mm.

3. Check that the needle threader position setter (a) and the

needle bar crank rod assembly (b) is parallel.

Case B (Hook point is too low)

Adjust needle threader position setter slightly up and check the

clearance between the top of hook and top of needle eye is 0 mm.

In case part (a) and part (b) is not parallel or the hook does not

work, readjust needle threader by loosening the screw.

If (a) and (b) are not parallel, the needle threader will not be held

by the needle threader position setter (refer to Fig. 1), the hook

will not enter the eyelet of the needle (hook will not move) and the

needle will not be threaded when the needle threader lever is

lowered. In this case, loosen the screw securing the needle

threader position setter and turn the needle threader position

setter slightly to the left to make it parallel.

In addition, if the needle threader position setter is turned too far

so that it is still not parallel too left, it may hit other parts, causing

damage (refer to Fig. 2). If a part is damaged, it must be replaced.

If no part is damaged, loosen the screw securing the needle

threader position setter and turn the needle threader position

setter slightly to the right to make it parallel.

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Brother PC-3000 Service Manual Page 56