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Brother International HE-800B Instruction Manual - English - Page 86

TROUBLESHOOTING, 11-1. Upper thread breakage

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11. TROUBLESHOOTING 11. TROUBLESHOOTING • Please check the following points before calling for repairs or service. • If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of purchase. CAUTION Turn off the power switch and disconnect the power cord before carrying out troubleshooting, otherwise the machine may operate if the treadle is depressed by mistake, which could result in injury. 11-1. Upper thread breakage Items with a "*" in the "Page" column should only be handled by a qualified technician. Cause Check Remedy Needle Needle facing As viewed from the direction of the face plate, attach the needle so that the groove of the needle faces frontward. Needle installation height Insert the end of the needle shank so that it touches the top edge of the needle hole of the needle bar. Bent needle Replace needle. Blunt needle tip or burr Replace needle. Needle and thread Replace needle that fits the thread. Threading Upper thread threading Thread the upper thread correctly. Lower thread threading Thread the lower thread correctly. Thread path Flaw or abrasion on the Polish with buff or replace the part. thread path Especially, pay attention to finishing around needle plate hole. Page 21 21 21 21 - 22 25 * Needle plate hole 3996Q Flaw on the rotary hook tip Polish with buff or replace the part. and rotary hook edge * Flaw on the rotary hook Polish with buff or replace the part. holder Check flaw here Adjust the rotary hook * overlap amount. 3997Q Thread tension Thread take-up spring Zigzag thread upper thread tension Bar tack thread upper thread tension Thread take-up spring tension and height Adjust the upper thread tension appropriately. 26, 27 Adjust the upper thread tension while checking stitches. (The stitches on top are the upper thread and the stitches underneath are the bobbin thread.) Loosen the thread take-up spring tension or lower the height to such a degree that does not cause double hooking. Adjust it while checking bar tacking stitches. 26, 27 28 (Continued on next page) 77 HE-800B

Section	Page
COVER	1
SAFETY INSTRUCTIONS	3
[1] Safety indications and their meanings	3
[2] Notes on safety	4
[3] Warning labels	6
CONTENTS	8
1. NAMES OF MAJOR PARTS	10
2. SPECIFICATIONS	11
2-1. Specifications	11
2-2. Standard sewing pattern list	12
3. INSTALLATION	13
3-1. Table processing diagram	13
3-2. Installing the control box	14
3-3. Installing the flange nut	15
3-4. Installing the bed base	15
3-5. Installing the machine head	16
3-6. Installing the head rest	16
3-7. Installing the operation panel	17
3-8. Installing the oil stopper plate	18
3-9. Connecting the cords	18
3-10. Connecting the ground wire	21
3-11. Installing the treadle connecting rod	22
3-12. Installing the cotton stand	23
3-13. Installing the eye guard	23
3-14. Lubrication	24
3-14-1. Lubricating the bed base	24
3-14-2. Lubricating the arm	24
3-14-3. Lubricating the rotary hook	25
3-15. Connecting the power cord	25
3-16. Checking the safety switch	28
3-17. Installing the motor cover	28
3-18. Installing the auxiliary table	29
4. PREPARATION BEFORE SEWING	30
4-1. Installing the needle	30
4-2. Threading the upper thread	31
4-3. Winding the lower thread	33
4-4. Installing the bobbin case	34
4-5. Thread tension	35
4-5-1. Lower thread tension	35
4-5-2. Upper thread tension	36
4-5-3. Thread take-up spring height	37
4-5-4. Thread take-up spring tension	37
4-5-5. Adjusting arm thread guide	37
5. USING THE SEWING MACHINE (OPERATION PANEL: BASIC OPERATION)	38
5-1. Name and function of each operation panel item	38
5-2. Starting the sewing machine	40
5-3. Operating the treadle	41
5-4. Program setting method	42
5-4-1. Parameter list	44
5-4-2. Setting the length of the hole	50
5-4-3. Buttonhole sewing size	50
5-4-4. Main restrictions when setting parameters	50
5-5. Rear tack vector shape programs	51
5-6. Underlay programs	52
5-7. Cutter operation	53
5-8. Copying programs	54
6. USING THE SEWING MACHINE (SEWING OPERATION)	56
6-1. Automatic sewing (Automatic sewing mode)	56
6-2. Test feeding mode	57
6-3. Using the STOP switch	59
6-3-1. Pausing sewing during automatic sewing	59
7. USING THE SEWING MACHINE (OPERATION PANEL: ADVANCED OPERATION)	61
7-1. Using cycle programs	61
7-2. Setting memory switches	64
7-2-1. List of memory switch settings	65
7-3. Resetting the data (initialization)	66
7-4. Changing the lower thread counter setting	67
7-5. Changing the production counter setting	68
7-6. Displaying the help screen	69
8. CLEANING	70
8-1. Cleaning	70
8-2. Draining the oil	71
8-3. Cleaning the control box air inlet port	71
8-4. Cleaning the eye guard	72
8-5. Checking the needle	72
8-6. Cleaning the length feed plate	72
9. STANDARD ADJUSTMENTS	73
9-1. Adjusting the needle bar height	73
9-2. Adjusting the needle and hook timing	74
9-3. Adjusting the clearance between needle and hook tip	75
9-4. Adjusting the inner rotary hook and rotary hook holder overlap	75
9-5. Adjusting the work clamp pressure	75
9-6. Adjusting the cutter installation	76
9-7. Adjusting the installation height of the upper thread trimmer	77
9-8. Adjusting the upper thread trimmer opening timing	78
9-9. Adjusting the lower thread clamp timing	79
9-10. Adjusting the bobbin presser	79
10. TABLE OF ERROR CODES	80
11. TROUBLESHOOTING	86
11-1. Upper thread breakage	86
11-2. Skipped stitches	87
11-3. Uneven seams (1) …… At the sewing start	89
11-4. Uneven seams (2) …… Lower thread is lifted up at the sewing start	90
11-5. Uneven seams (3) ……Seam lifts up at the sewing start	90
11-6. Uneven seams (4) …… Uneven sewing pitch at the sewing start	91
11-7. Uneven seams (5)……Poor rounding of seam	91
11-8. Uneven seams (6) …… Around rear tack or front tack	91
11-9. Uneven seams (7) …… Loose thread end at end backtack	91
11-10. Uneven seams (8) …… Thread sticking out at end backtack	92
11-11. Uneven seams (9) …… Sticking in needle plate	92
11-12. Uneven seams (10) …… All stitches	93
11-13. Upper thread run out	94
11-14. Unraveling of thread trimmed by upper thread trimmer assembly	96
11-15. Upper thread miss-trimming	97
11-16. Needle strikes upper thread trimmer	98
11-17. Needle breakage	99
11-18. Imperfect cutter function (imperfect material cutting)	100
11-19. Cutter does not return	100
11-20. Cutter and upper thread trimmer touch	101
11-21. Seam is cut	101
11-22. Upper thread miss-winding	102
11-23. Work clamp is not raised (1)…… Pulse motor stepping sound cannot be heard	102
11-24. Work clamp is not raised (2)…… Pulse motor stepping sound can be heard	103
11-25. Lower thread is not trimmed (pulls when material is removed)	104
11-26. Feed mechanism does not operate or motor is out of step	104
11-27. Needle does not zigzag or noise occurs when needle zigzags	105
11-28. Sewing machine stops during sewing	105
11-29. Upper shaft does not rotate as far as the needle up stop position	105
11-30. Operation panel display freezes and operation is not possible	105

Match case Limit results 1 per page

HE-800B

11. TROUBLESHOOTING

• Please check the following points before calling for repairs or service.

• If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of

purchase.

CAUTION

Turn off the power switch and disconnect the power cord before carrying out troubleshooting, otherwise the

machine may operate if the treadle is depressed by mistake, which could result in injury.

11-1. Upper thread breakage

Items with a “*” in the “Page” column should only be handled by a qualified technician.

Cause

Check

Remedy

Page

Needle facing

As viewed from the direction of the face plate, attach

the needle so that the groove of the needle faces

frontward.

Needle installation height

Insert the end of the needle shank so that it touches

the top edge of the needle hole of the needle bar.

Bent needle

Replace needle.

Blunt needle tip or burr

Replace needle.

Needle

Needle and thread

Replace needle that fits the thread.

–

Upper thread threading

Thread the upper thread correctly.

Threading

Lower thread threading

Thread the lower thread correctly.

Flaw or abrasion on the

thread path

Polish with buff or replace the part.

Especially, pay attention to finishing around needle

plate hole.

Flaw on the rotary hook tip

and rotary hook edge

Polish with buff or replace the part.

Thread path

Flaw on the rotary hook

holder

Polish with buff or replace the part.

Zigzag thread upper thread

tension

Adjust the upper thread tension appropriately.

26, 27

Thread tension

Bar

tack

thread

upper

thread tension

Adjust the upper thread tension while checking

stitches. (The stitches on top are the upper thread and

the stitches underneath are the bobbin thread.)

26, 27

Thread take-up spring

Thread

take-up

spring

tension and height

Loosen the thread take-up spring tension or lower the

height to such a degree that does not cause double

hooking. Adjust it while checking bar tacking stitches.

(Continued on next page)

3996Q

3997Q

Needle plate hole

Adjust the rotary hook

overlap amount.

Check flaw here