Table Of Contents - Brother T-8421B Instructions Manual

1. MACHINE SPECIFICATIONS ..............
2. NAMES OF MAJOR PARTS ................
3. INSTALLATION ....................................
3-1. Table processing diagram .............................. 5
3-2. Installation ...................................................... 5
3-3. Lubrication ...................................................... 9
3-4. Connecting the cords...................................... 11
3-4-1. Opening the control box cover ............ 11
3-4-2. Connecting the cords .......................... 11
3-5. Test operation (Operating the treadle) ........... 15
4. PREPARATION BEFORE SEWING.....
4-1. Installing the needle........................................... 16
4-2. Removing the bobbin...................................... 17
4-3. Winding the lower thread................................ 18
4-4. Installing the bobbin........................................ 19
4-5. Threading the upper thread ............................ 21
4-6. Adjusting the stitch length............................... 23
4-7. Using the knee lifter........................................ 23
4-8. Using the thread wiper
(Models with thread trimmer only) .................. 23
4-9. Corner sewing method (T-8452B, 8752B)...... 24
4-9-1. To stop the needle bars
(right and left) ..................................... 24
4-9-2. Number of stitches: quick-reference
guide ................................................... 24
5. USING THE OPERATION PANEL
(BASIC OPERATIONS) ........................
5-1. Names and functions...................................... 25
5-2. Sewing start and end backtack stitches ......... 27
5-3. Sewing fixed stitches ...................................... 28
5-4. Using the lower thread counter ...................... 29
6. USING THE OPERATION PANEL
(ADVANCED OPERATIONS) ...............
6-1. Names and functions...................................... 30
6-2. Adjusting the needle up stop position............. 31
6-3. LOCK key ....................................................... 31
6-4. Resetting all settings to their defaults............. 31
CONTENTS
7. SEWING ...............................................
1
7-1. Sewing ............................................................32
3
7-2. Backtacking.....................................................33
4 7-3. Sewing condensed stitches ............................34
8. THREAD TENSION ..............................
8-1. Adjusting the thread tension ...........................35
8-2. Adjusting the presser foot pressure ................36
8-3. Adjusting the presser foot floating amount
8-4. Adjusting the trailing length after thread
16 8-5. Adjusting the thread take-up amount..............38
9. CLEANING ...........................................
9-1. Daily cleaning procedures...............................39
9-2. Lubricating via the oil cover
9-3. Applying grease - When "GREASEUP"
10. ADJUSTING THE ROTARY HOOK
11. TROUBLESHOOTING........................
11-1. Sewing ..........................................................45
11-2. Error code displays .......................................50
25
30
T-8421B, 8422B, 8452B, 8722B, 8752B
(minute lifting amount) ....................................37
trimming (Models with thread trimmer only)....37
(every 6 months) .............................................40
appears (Semi dry specifications)...................41
LUBRICATION AMOUNT...................
32
35
39
44
45