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Brother International BAS-342G Instruction Manual - English - Page 80

TROUBLESHOOTING, Problem, Cause, Remedy, Reference, Upper thread breaks., Skipped stitches occur.

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13. TROUBLESHOOTING Problem Cause Upper thread breaks. Upper thread tension is too strong. Remedy Adjust the upper thread tension. Reference P. 24 Needle is incorrectly installed. Install the needle correctly. P. 19 Thread is too thick for the needle. Select a thread that matches the needle. Thread take-up spring tension and Adjust the tension and height of the height are incorrect. thread take-up spring. Damage or burring of the rotary hook, needle hole plate or needle. Repair or replace the problem part. Thread breaking from heat (Synthetic thread) Use a cooling tank. Thread is threaded incorrectly. Thread the thread correctly. Lower thread breaks. Lower thread tension is too strong. Adjust the lower thread tension. Damage to corners of needle hole plate or bobbin case. Repair or replace the problem part. Skipped stitches occur. Clearance between needle and rotary hook tip is too great. Adjust the needle clearance. Needle and incorrect. rotary hook timing is Adjust the needle bar lift amount. The driver is covering the needle more than necessary. Adjust the driver needle guard. Needle is bent. Replace the needle. P. 24 P. 55 P. 20 P. 20 P. 24 P. 57 P. 56 P. 57 Needle is broken. Needle is incorrectly installed. Install the needle correctly. Clearance between needle and rotary hook tip is too great. Adjust the needle clearance. Adjust the needle bar lift amount. P. 19 P. 57 P. 56 Thread jamming. Needle is bent. Replace the needle. Needle deflection Needle is too thin. Select a needle that is suitable for the sewing conditions. Reduce the sewing speed. Select a needle that is suitable for the sewing conditions. Thread take-up spring tension and Adjust the tension and height of the height are incorrect. thread take-up spring. Needle and incorrect. rotary hook timing is Adjust the needle bar lift amount. Shuttle race thread guide is not Adjust the position of the shuttle race separating the threads. thread guide. P. 24 P. 30 P. 24 P. 55 P. 56 P. 57 71 BAS-342G

Section	Page
COVER	1
SAFETY INSTRUCTIONS	3
CONTENTS	8
1. NAMES OF MAJOR PARTS	10
2. SPECIFICATIONS	11
3. TABLE PROCESSING DIAGRAM	12
4. INSTALLATION	13
4-1. Removing the machine head fixing bolts [1]	13
4-2. Installing the control box [2]	14
4-3. Installing the oil pan and support lever base	15
4-4. Installing the machine head	15
4-5. Tilting back and returning the machine head	16
4-6. Installing the gas spring	17
4-7. Installing the operation panel [3]	18
4-8. Installing the solenoid valve assembly	19
4-9. Connecting the air tubes [4]	19
4-10. Installing the air hose [5]	19
4-11. Adjusting the air pressure [6]	20
4-12. Adjusting the speed controller [7]	20
4-13. Connecting the cords [8]	21
4-14. Connecting the ground wire [9]	23
4-15. Securing the cords and air tubes [10]	24
4-16. Installing the eye guard [11]	25
4-17. Installing the cotton stand [12]	25
4-18. Lubrication [13]	26
4-19. Connecting the power cord [14]	27
4-20. Checking the safety switch [15]	27
5. PREPARATION BEFORE SEWING	28
5-1. Installing the needle	28
5-2. Operating the 2-pedal foot switch	28
5-3. Threading the upper thread	29
5-4. Winding the lower thread	31
5-5. Installing the bobbin case	32
5-6. Thread tension	33
5-6-1. Lower thread tension	33
5-6-2. Upper thread tension	33
5-7. Home position detection	34
5-8. Setting 2-step operation for the work clamp	35
6. USING THE OPERATION PANEL (BASIC OPERATIONS)	36
6-1. Name and function of each operation panel item	36
6-2. Loading sewing data	38
6-3. Setting the program number	38
6-4. Setting the X-scale and Y-scale	39
6-5. Setting the sewing speed	39
6-6. Checking the sewing pattern	40
6-7. Setting the height of the intermittent presser foot	41
7. USING THE OPERATION PANEL (ADVANCED OPERATIONS)	42
7-1. List of advanced functions	42
7-2. Setting memory switches	43
7-3. List of memory switch settings	44
7-4. Using the lower thread counter	45
7-5. Using the production counter	46
7-6. Setting the split number	47
7-7. Using user programs	48
7-8. Using cycle programs	51
7-9. Direct selection (combination table)	53
7-10. X and Y parallel movement of sewing pattern	54
7-11. Clearing memory data (reinitialization)	55
8. USING CF CARDS	56
8-1. Notes on handling CF cards (sold separately)	56
8-2. Structure of a CF card folder	56
8-3. Data read/write mode	57
8-3-1. Reading all sewing data from the CF card at once	58
8-3-2. Writing all sewing data to the CF card at once	59
9. SEWING	60
9-1. Sewing	60
9-2. Using the STOP switch	61
9-3. Using the thread wiper switch	61
10. CLEANING	62
10-1. Cleaning the rotary hook	62
10-2. Draining the oil	62
10-3. Checking the regulator	63
10-4. Cleaning the control box air inlet ports	63
10-5. Cleaning the eye guard	63
10-6. Checking the needle	63
10-7. Lubrication	63
11. STANDARD ADJUSTMENTS	64
11-1. Adjusting the thread take-up spring	64
11-2. Adjusting arm thread guide R	65
11-3. Adjusting the needle bar height	65
11-4. Adjusting the needle bar lift amount	65
11-5. Adjusting the driver needle guard	66
11-6. Adjusting the needle clearance	66
11-7. Adjusting the shuttle race thread guide	66
11-8. Adjusting the rotary hook lubrication amount	67
11-9. Adjusting the position of the movable knife	68
11-10. Replacing the movable and fixed knives	70
11-10-1. Installing the feed plate	71
11-11. Adjusting the thread wiper	71
11-12. Presser foot installation position	72
11-13. Changing the intermittent stroke	72
11-14. Adjusting the work clamp lift amount	74
11-15. Adjusting the air pressure	74
12. TABLE OF ERROR CODES	75
13. TROUBLESHOOTING	79
14. 7-SEGMENT DISPLAY	82

Match case Limit results 1 per page

13. TROUBLESHOOTING

BAS-342G

Problem

Cause

Remedy

Reference

Upper thread tension is too strong.

Adjust the upper thread tension.

P. 24

Needle is incorrectly installed.

Install the needle correctly.

P. 19

Thread is too thick for the needle.

Select a thread that matches the needle.

P. 24

Thread

take-up

spring

tension

and

height are incorrect.

Adjust the tension and height of the

thread take-up spring.

P. 55

Damage or burring of the rotary hook,

needle hole plate or needle.

Repair or replace the problem part.

Thread breaking from heat (Synthetic

thread)

Use a cooling tank.

P. 20

Upper thread breaks.

Thread is threaded incorrectly.

Thread the thread correctly.

P. 20

Lower thread tension is too strong.

Adjust the lower thread tension.

P. 24

Lower thread breaks.

Damage to corners of needle hole plate

or bobbin case.

Repair or replace the problem part.

Clearance between needle and rotary

hook tip is too great.

Adjust the needle clearance.

P. 57

Needle

and

rotary

hook

timing

incorrect.

Adjust the needle bar lift amount.

P. 56

The driver is covering the needle more

than necessary.

Adjust the driver needle guard.

P. 57

Needle is bent.

Replace the needle.

Skipped stitches occur.

Needle is incorrectly installed.

Install the needle correctly.

P. 19

Adjust the needle clearance.

P. 57

Clearance between needle and rotary

hook tip is too great.

Adjust the needle bar lift amount.

P. 56

Needle is bent.

Replace the needle.

Needle deflection

Select a needle that is suitable for the

sewing conditions.

Reduce the sewing speed.

P. 24

P. 30

Needle is broken.

Needle is too thin.

Select a needle that is suitable for the

sewing conditions.

P. 24

Thread

take-up

spring

tension

and

height are incorrect.

Adjust the tension and height of the

thread take-up spring.

P. 55

Needle

and

rotary

hook

timing

incorrect.

Adjust the needle bar lift amount.

P. 56

Thread jamming.

Shuttle

race

thread

guide

not

separating the threads.

Adjust the position of the shuttle race

thread guide.

P. 57