White 1781 manual Trouble Chart, EquiJr

PROBLEM

Breaking

lower

thread

PROBABLE

CAUSE

Thread

not wound

evenly

on

the

bobbin

drawn

up

correctly

or not

Lower

thread

tension

too

tight

Lint

stuck

in

the

bobbin

case

and

inside

spring

the

tension

P.10,

P.15

P.12

Remove

lint

a

and fluff with

cleaning

brush

P.

6

Needle

not

fully

inserted

Needle

bent

Size

or

type

of

needle

and

material

suitable

for

the

Incorrect

upper

threading

Too

much

oil

on

the

hook

P.

6

P.16

Incorrect

size

of

needle

for the

Upper

thread

tension

too

loose

Incorrect

lower

tension

The

material

not

fed

correctly

Pattern

selection

dial not

set correctly

Incorrect

feed

dog

height

Lint stuck

on

the

feed dog