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Brother International T-8752C Instruction Manual - English - Page 60

THREAD TENSION, 10-1. Adjusting the thread tension

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10. THREAD TENSION 10. THREAD TENSION 10-1. Adjusting the thread tension Good even stitches 0572M Upper thread Lower thread 0573M Upper thread tension too weak or lower thread tension too strong Increase the upper thread tension. Decrease the lower thread tension. 0574M Upper thread tension too strong or lower thread tension too weak Decrease the upper thread tension. Increase the lower thread tension. 2473B CAUTION Turn off the power switch before adjusting the lower thread tension. The machine may operate if the treadle is depressed by mistake, which could result in injury. Turn the adjusting screw (1) to adjust. Becomes weaker Becomes stronger Becomes stronger 2923M Becomes stronger Becomes weaker After the lower thread tension has been adjusted, adjust the upper thread tension so that a good, even stitch is obtained. 1. Lower the presser foot. 2. Adjust by turning the tension nut (2). Becomes weaker 51 Becomes weaker Becomes stronger 2924M T-8421C, 8422C, 8452C, 8722C, 8752C

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. MACHINE SPECIFICATIONS	10
2. NAMES OF MAJOR PARTS	12
3. INSTALLATION	13
3-1. Table processing diagram	14
3-2. Installation	14
3-3. Lubrication	18
3-4. Connecting the cords	20
3-4-1. Opening the control box cover	20
3-4-2. Connecting the cords	20
3-5. Test operation (Operating the treadle)	25
3-6. Adjusting the treadle operation	26
4. PREPARATION BEFORE SEWING	27
4-1. Installing the needle	27
4-2. Removing the bobbin	28
4-3. Winding the lower thread	29
4-4. Installing the bobbin	30
4-5. Threading the upper thread	32
4-6. Adjusting the stitch length	34
4-7. Using the knee lifter	34
4-8. Using the thread wiper (models with thread trimmer only)	34
4-9. Corner sewing method (T-8452C, 8752C)	35
4-9-1. To stop the needle bars (right and left)	35
4-9-2. Number of stitches: quick-reference guide	35
5. USING THE G50 OPERATION PANEL(BASIC OPERATIONS)	36
5-1. Names and functions	36
5-2. Sewing start and end backtack stitches	38
5-3. Sewing continuous backtack stitches	39
5-4. Sewing fixed stitches	40
5-5. Sewing pleat presser stitches	41
5-6. Using the lower thread counter	42
6. USING THE G50 OPERATION PANEL(ADVANCED OPERATIONS)	43
6-1. Names and functions	43
6-2. Adjusting the needle up stop position	44
6-3. LOCK key	45
6-4. Resetting all settings to their defaults	46
7. USING THE G10 OPERATION PANEL(BASIC OPERATIONS)	47
7-1. Names and functions	47
7-2. Sewing start and end backtack stitches	48
7-3. Sewing continuous backtack stitches	49
8. USING THE G10 OPERATION PANEL(ADVANCED OPERATIONS)	50
8-1. Changing the needle stop position	50
8-2. Slow start	51
8-3. Correction sewing	52
8-4. Thread trimming lock (models with thread trimmer only)	53
8-5. Setting the maximum sewing speed	54
8-6. Adjusting the needle up stop position	55
8-7. Lock function	56
8-8. Resetting all settings to their defaults	56
9. SEWING	57
9-1. Sewing	57
9-2. Backtacking	58
9-3. Sewing condensed stitches	59
10. THREAD TENSION	60
10-1. Adjusting the thread tension	60
10-2. Adjusting the presser foot pressure	61
10-3. Adjusting the presser foot floating amount (minute lifting amount)	62
10-4. Adjusting the trailing length after thread trimming (models with thread trimmer only)	62
10-5. Adjusting the thread take-up amount	63
11. CLEANING	64
11-1. Daily cleaning procedures	64
11-2. Lubricating via the oil cover (every 6 months)	65
11-3. Applying grease (Semi dry specifications)[When “GrUP” appears ... When using the G50 operation panel]	66
11-4. Applying grease (Semi dry specifications)[When “GrUP” appears ... When using the G10 operation panel]	69
12. ADJUSTING THE ROTARY HOOK LUBRICATION AMOUNT	72
13. STANDARD ADJUSTMENT	73
13-1. Safety switch position	73
13-2. Thread take-up amount for thread take-up spring	74
13-3. Thread take-up spring tension	75
13-4. Clearance between rotary hook and needle plate	76
13-5. Clearance between rotary hook and opener	77
13-6. Presser foot height	77
13-7. Needle and rotary hook timing	78
13-8. Installing the feed dog	80
13-9. Feed dog position	81
13-10. Feed dog height	82
13-11. Feed dog angle	83
14. TROUBLESHOOTING	84
14-1. Sewing	84
14-2. Error code displays	89
15. 7-SEGMENT DISPLAY	93