APPENDIX —————————————————————————————————————————————————————

Symptom

Probable Cause

Remedy

Reference Page

 

 

 

 

Sliding surface on hook is not smooth. There are burns on it.

1

 

 

 

 

Consult your nearest authorized

 

 

 

dealer.

 

 

1 Hook race area

 

 

 

 

 

 

 

The thread is loose in the hook

Remove the loose thread. If the

 

 

thread is tangled in the hook,

p.193

 

area.

 

clean the hook.

 

 

 

 

 

The play between the hook and

Consult your nearest authorized

 

 

the race is too much.

dealer.

 

 

The hook does not rotate

Remove lint, and clean and

p.193, 196

 

smoothly.

apply oil.

 

 

 

The space between the hook

Consult your nearest authorized

 

 

stopper and the hook cannot be

 

 

dealer.

 

 

adjusted.

 

 

 

 

 

The upper thread is not threaded

 

 

 

correctly.

 

 

 

 

Pull the upper thread by hand

 

 

 

from below the presser foot, and

 

 

 

check that the thread moves

 

 

 

smoothly. If the thread does not

 

The upper thread

move smoothly, it is not

 

correctly threaded.

p.35-38

breaks.

Un-thread the machine and

 

 

 

 

 

 

re-thread the machine.

 

 

 

Make sure the thread is correctly

 

 

 

positioned in the needle bar

 

 

 

thread guide.

 

 

 

 

 

 

Upper thread is not positioned

Make sure thread passes

 

 

completely under upper and

p.36-37

 

in upper or middle thread guide.

 

middle thread guide.

 

 

 

 

 

There are knots or tangles in the

Remove any knots or tangles.

 

 

thread.

 

 

 

 

 

The upper thread tension is too

Decrease the upper thread

p.86

 

high.

tension.

 

 

 

The lower thread tension is

 

 

 

incorrect.

Adjust the lower thread tension.

p.85

 

The thread does not roll out of

 

 

 

 

the bobbin case smoothly.

 

 

 

The bobbin case is damaged.

Replace the bobbin case with a

p.15

 

new one.

 

 

 

 

 

Check that the bobbin is wound

 

 

 

so that it about 80% full and that

 

 

The bobbin thread is not wound

the thread is evenly wound. If

 

 

the bobbin is not correctly

p.15

 

correctly.

 

wound, replace the bobbin with

 

 

 

 

 

 

one that is correctly wound or

 

 

 

rewind the bobbin.

 

 

A bobbin designed specifically

Use the correct bobbin.

p.15

 

for this machine is not used.

 

 

 

202

Page 219
Image 219
Brother PR-620 operation manual 202, Area, Upper or middle thread guide

PR-620 specifications

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