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Brother International LK3-B434E MKII Instruction Manual - English - Page 71

TROUBLESHOOTING, The thread wiper is

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17. TROUBLESHOOTING 17. TROUBLESHOOTING Problem Cause Check Remedy Page Work clamp does not rise. Work clamp operation is sluggish. Work clamp lift amount is too great. Too much friction between presser plate and presser arm lever support. Sliding part of the work clamp lubrication Distance between work clamp and top of needle plate Presser plate and presser arm lever support lubrication Grease the sliging part of the work 40 clamp. Adjust the height of the work clamp to 40 within 17 mm. Grease the presser plate and presser arm 40 lever support. Work clamp is contacting thread wiper. Thread wiper standby position Adjust the position of the thread wiper. 42 Work clamp does not Presser lifter link is drop. not moving back. Link return spring is unhooked. Hook the link return spring properly. Work clamp lift amount is incorrect. Incorrect position of presser arm lever plate. Distance between work clamp and top of needle plate Adjust the work clamp lift amount. 40 Thread wiper does not operate correctly. The thread wiper is obstructing the needle. Thread wiper position is incorrect. Clearance beween thread wiper and needle tip Thread wiper position Adjust the height of the thread wiper. 42 Adjust the operating distance of the thread 42 wiper. Lower thread winds to one side. Bobbin winder thread tension stud height is incorrect. Bobbin winder thread tension stud height Adjust the height of the thread tension stud. 27 Lower thread winding amount is incorrect. Bobbin presser position is incorrect. Thread winding amount Adjust the position of the bobbin presser. 27 Stitches being skipped at the sewing start. Refer to "Skipped stitches occur" Refer to "Skipped stitches occer". Threads comes unthreaded. Uneven upper thread length. Upper thread length Adjust the subtension. 29 Upper thread is too short. Thread take-up lever stroke Adjust the thread take-up lever stroke. 37 65 LK3-B434E Mark II

Section	Page
Go to Instruction Manual Top Page	1
SAFETY INSTRUCTIONS	2
CONTENTS	6
1. NAME OF EACH PART	7
2. SPECIFICATIONS	8
2-1. Specifications	8
2-2. Examples of sewing patterns	9
3. INSTALLATION	10
3-1. Power table	10
3-2. Installing the motor	11
3-3. Installing the motor pulley	11
3-4. Installing the control box	12
3-5. Installing the rubber cushions	13
3-6. Installing the oil pan	13
3-7. Installing the cushions	13
3-8. Installing the machine head	14
3-9. Installing the head rest	14
3-10. Installing the liquid cooling tank, optional	14
3-11. Installing the operation panel	15
3-12. Connecting the ground wire	15
3-13. Connecting the cords	16
3-14. Piping (for pneumatic)	18
3-14-1. Installing the air unit	19
3-14-2. Adjusting the speed controller	19
3-15. Installing the V-belt	20
3-16. Installing the belt cover	21
3-17. Installing the foot switch	21
3-18. Installing the motor cover	22
3-19. Installing the spool stand	22
3-20. Installing the needle sub plate	23
3-21. Installing the eye guard	24
4. LUBRICATION	25
4-1. Lubrication points	25
5. OPERATION	26
5-1. Name and function of each operation panel item	26
5-2. Operating procedure	28
5-2-1. Setting the program number	28
5-2-2. Setting the X-scale and Y-scale	28
5-2-3. Setting the sewing speed	28
5-3. Operating the foot switch	29
5-4. Operating the emergency stop switch	30
6. CHECKING THE SEWING PATTERN	31
7. CORRECT USE	32
7-1. Selecting the needle and thread	32
7-2. Installing the needle	32
7-3. Threading the upper thread	32
7-4. Winding the lower thread	33
7-5. Replacing the bobbin case and threading the thread	34
7-6. Sewing conditions and thread tension	34
7-6-1. Guide to maximum sewing speed	35
7-6-2. Lower thread tension	35
7-6-3. Upper thread tension	35
7-6-4. Thread take-up spring height	36
7-6-5. Thread take-up spring tension	36
7-6-6. Adjusting arm thread guide R	36
7-6-7. Thread take-up amount	36
8. SEWING	37
9. MAINTENANCE AND INSPECTION	38
9-1. Cleaning the rotary hook	38
9-2. Lubrication	39
9-3. Draining the oil	40
9-4. Cleaning the control box air inlet port	40
9-5. Cleaning the eye guard	40
9-6. Checking the needle	40
10. STANDARD ADJUSTMENTS	41
10-1. Adjusting the needle bar height	41
10-2. Adjusting the needle bar lift amount	41
10-3. Adjusting the driver needle guard	42
10-4. Adjusting the needle clearance	42
10-5. Adjusting the shuttle race thread guide	42
10-6. Adjusting the thread take-up amount	43
10-7. Adjusting the movable knife	43
10-7-1. Replacing the movable knife and fixed knife	44
10-7-2. Adjusting the engagement of the movable knife and fixed knife	45
10-8. Adjusting the work clamp lift amount	46
10-9. Work clamp interchangeability	47
10-10. Adjusting the needle up stop position	47
10-11. Adjusting the thread wiper	48
10-12. Checking the input sensor and DIP switch input	49
10-13. Checking the input voltage	50
10-14. Clearing all memory settings	50
10-15. Moving stitch patterns	51
10-16. Adjustment of air pressure (for pneumatic)	52
10-17. Adjustment of inner clamping device	52
11. USING THE COUNTERS	53
11-1. Using the bobbin thread counter	53
11-2. Using the production counter	53
12. CHANGING FUNCTIONS USING THE DIP SWITCHES	54
12-1. Operation panel DIP switches	54
12-2. DIP switches inside the control box	55
12-3. Using user programs	56
13. CHANGING SPECIAL FUNCTIONS USING THE MEMORY SWITCHES	58
13-1. Using the cycle sewing function	61
14. SETTING THE WORK CLAMP MODE	63
14-1. Setting solenoid work clamp mode	63
14-2. Setting pneumatic work clamp mode	63
14-3. Light work clamp	64
14-4. Setting reverse work clamp mode	65
15. TABLE OF ERROR CODES	66
16. GAUGE PARTS LIST ACCORDING TO SUBCLASSES	68
17. TROUBLESHOOTING	71
18. OPTIONAL PARTS	74

Match case Limit results 1 per page

LK3-B434E Mark II

17. TROUBLESHOOTING

Problem

Cause

Check

Remedy

Page

Work clamp does not

rise.

Work clamp does not

drop.

Work clamp lift

amount is incorrect.

Work clamp

operation is sluggish.

Sliding part of the

work clamp

lubrication

Grease the sliging

part of the work

clamp.

Work clamp lift

amount is too great.

Distance between

work clamp and top

of needle plate

Adjust the height of

the work clamp to

within 17 mm.

Too much friction between

presser plate and presser

arm lever support.

Presser plate and

presser arm lever

support lubrication

Grease the presser

plate and presser arm

lever support.

Work clamp is

contacting thread wiper.

Thread wiper standby

position

Adjust the position of

the thread wiper.

Presser lifter link is

not moving back.

Link return spring is

unhooked.

Hook the link return

spring properly.

Incorrect position of

presser arm lever

plate.

Distance between

work clamp and top

of needle plate

Adjust the work

clamp lift amount.

Thread wiper does

not operate correctly.

The thread wiper is

obstructing the

needle.

Clearance beween

thread wiper and

needle tip

Adjust the height of

the thread wiper.

Thread wiper

position is incorrect.

Thread wiper

position

Adjust the operating

distance of the thread

wiper.

Lower thread winds

to one side.

Bobbin winder thread

tension stud height is

incorrect.

Bobbin winder thread

tension stud height

Adjust the height of

the thread tension

stud.

Lower thread

winding amount is

incorrect.

Bobbin presser

position is incorrect.

Thread winding

amount

Adjust the position of

the bobbin presser.

Stitches being

skipped at the sewing

start.

Refer to

“

Skipped

stitches occur

”

Refer to

“

Skipped

stitches occer

”

Threads comes

unthreaded.

Uneven upper thread

length.

Upper thread length

Adjust the sub-

tension.

Upper thread is too

short.

Thread take-up lever

stroke

Adjust the thread

take-up lever stroke.