Brother International BAS-342G Instruction Manual - English - Page 64

11. STANDARD ADJUSTMENTS

BAS-342G

55

11. STANDARD ADJUSTMENTS

CAUTION

Maintenance and inspection of the sewing machine

should only be carried out by a qualified technician.

Ask your Brother dealer or a qualified electrician to

carry out any maintenance and inspection of the

electrical system.

Turn off the power switch and disconnect the power

cord before carrying out the following operations.

If the foot switch is depressed by mistake, the sewing

machine might start operating and injury could result.

•

Inspection, adjustment and maintenance

•

Replacing consumable parts such as the rotary

hook

Disconnect the air hoses from the air supply and wait

for the needle on the pressure gauge to drop to “0”

before carrying out inspection, adjustment and repair

of any parts which use the pneumatic equipment.

If the power switch and air need to be left on when

carrying out some adjustment, be extremely careful

to observe all safety precautions.

Hold the machine head with both hands when tilting it

back or returning it to its original position.

In addition, do not subject the machine head to extra

force while it is tilted back. If this is not observed, the

machine head may become unbalanced and fall

down, and serious injury or damage to the sewing

machine may result.

Be sure to wear protective goggles and gloves when

handling the lubricating oil and grease, so that they

do not get into your eyes or onto your skin. If the oil

and grease get into your eyes or onto your skin,

inflammation can result.

Furthermore, do not drink or eat the lubricating oil or

grease. They may cause diarrhea or vomiting.

Keep the oil out of the reach of children.

If any safety devices have been removed, be

absolutely sure to re-install them to their original

positions and check that they operate correctly

before using the machine.

11-1. Adjusting the thread take-up spring

Thread take-up spring height (mm)

7

−

10

Thread take-up spring tension (N)

0.6

−

1.2

<Thread take-up spring height>

Loosen the set screw (1) and turn the adjuster to adjust.

<Thread take-up spring tension>

1. Press the upper thread slightly above the tension

bracket (2) with a finger to stop the thread spooling out.

2. Pull the upper thread downward so that the thread

take-up spring (3) is extended to the same height as the

base of the thread guide arm (4), and then measure the

tension of the thread take-up spring (3).

3. Use a screwdriver to turn the tension stud (5) in order to

adjust the tension of the thread take-up spring (3).

NOTE:

If the thread tension spring (3) is not adjusted correctly, the upper thread trailing length will be uneven after thread

trimming.

Lower

Higher

4029M

4030M

Weaker

Stronger

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

Brother International BAS-342G Instruction Manual - English - Page 64

STANDARD ADJUSTMENTS, 11-1. Adjusting the thread take-up spring

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