6. TROUBLESHOOTING

６. TROUBLESHOOTING

CAUTION

Turn off the power switch and disconnect the power cord before carrying out troubleshooting, otherwise the machine will operate if the foot switch is depressed by mistake, which could result in injury.

Problem

 

 

 

Cause

 

 

 

 

Remedy

 

Ref.

 

 

 

 

Work clamp does not

<430, 431, 433, 434, 435, 436, 484>

Grease the sliding part of the work

P.104

rise.

 

 

Work clamp operation is sluggish.

clamp.

 

 

 

 

P.105

Button

clamp

does

 

 

 

 

 

 

 

 

 

 

Work

clamp

(Button

clamp) lift

Adjust

the

work

clamp

(button

P.104

not rise. (438)

 

amount is too great.

 

 

clamp) lift amount.

 

 

P.105

 

 

 

 

 

 

 

P.106

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Too much friction between work

 

 

 

 

 

 

 

 

 

clamp plate and work clamp arm

Grease the work clamp plate and

P.104

 

 

 

lever plate. (430, 431, 433, 434

work clamp arm lever plate.

 

P.105

 

 

 

solenoid specifications)

 

 

 

 

 

 

 

 

 

 

 

Work

clamp

is contacting

thread

Adjust

the

position

of the

thread

P.111

 

 

 

-

 

 

 

wiper.

 

 

 

 

wiper.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.113

 

 

 

 

 

 

 

 

 

 

 

 

 

Work clamp is

not

 

 

 

 

 

 

 

 

 

 

P.65

lowered.

 

Presser lifter

link is

not

moving

Check

if the link return spring is

 

-

Button clamp is not

back.

 

 

 

 

unhooked.

 

 

 

 

 

 

 

 

 

 

P.68

lowered. (438)

 

 

 

 

 

 

 

 

 

 

 

 

Work

clamp

lift

<Solenoid specifications>

 

 

 

 

 

 

 

amount is incorrect.

Incorrect position of work clamp arm

 

 

 

 

 

 

Button

clamp

lift

lever

plate (button clamp

holder

Adjust

the

work

clamp

(button

P.104

amount

is incorrect.

hook assembly).

 

 

P.105

 

 

clamp) lift amount.

 

 

(438)

 

 

<Pneumatic specifications>

 

 

 

P.106

 

 

 

 

 

 

 

 

 

 

 

Incorrect position of work clamp arm

 

 

 

 

 

 

 

 

 

lever.

 

 

 

 

 

 

 

 

 

 

Work clamp does not

Incorrect position of presser closing

Check whether stop lever is

 

close. (432)

 

engaged

with

stop

position

P.108

 

 

 

roller.

 

 

 

 

adjusting plate or not, and adjust

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

the position of presser closing roller.

 

Thread

wiper

does

 

 

 

 

 

Adjust

the

height

of the

thread

P.111

not operate correctly.

The thread wiper is obstructing the

wiper.

 

 

 

 

-

 

 

 

 

P.113

 

 

 

needle.

 

 

 

Adjust the operating distance of the

P.111

 

 

 

 

 

 

 

 

-

 

 

 

 

 

 

 

 

thread wiper.

 

 

 

 

 

 

 

 

 

 

 

 

P.113

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Adjust the operating distance of the

P.111

 

 

 

Thread wiper position is incorrect.

-

 

 

 

thread wiper.

 

 

 

 

 

 

 

 

 

 

 

 

P.113

 

 

 

 

 

 

 

 

 

 

 

 

 

Lower

thread winds

Tension stud height is incorrect.

Adjust the height of the tension

Instruction

to one side.

 

 

 

 

 

 

stud.

 

 

 

 

manual

Lower thread winding

Bobbin presser position is incorrect.

Adjust the position of the bobbin

Instruction

amount is incorrect.

 

 

 

 

 

presser.

 

 

 

manual

Thread

comes

Stitches being skipped at the

Refer to “Skipped stitches occur”

P.134

unthreaded.

 

sewing start.

 

 

 

 

 

 

 

 

 

 

 

 

Uneven needle thread.

 

 

Adjust the sub-tension.

 

Instruction

 

 

 

 

 

 

manual

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Needle thread is too short.

 

Adjust

the

thread

take-up lever

P.114

 

 

 

 

stroke.

 

 

 

 

P.115

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

133

KE-430B, 430C series