SERVICE MANUAL MODEL: 3160QDC (G)(Fourth speci f ication)
First Edition: 21 April 2023
INDEX
| WHAT TO DO WHEN ......................................................................................................... | 1 to 3 |
|---|---|
| CHANGING EXTERNAL PARTS | |
| FACE COVER ........................................................................................................................... | 4 |
| FREE ARM COVER ................................................................................................................. | 5 |
| FRONT COVER ............................................................................................................... | 6 |
| REAR COVER......................................................................................................................... | 7 |
| MECHANICALADJUSTMENT | |
| PRESSER BAR HEIGHT ........................................................................................................ | 8 |
| NEEDLE DROP POSITION..................................................................................................... | 9 |
| ADJUSTMENT OF HOOK TIMING ......................................................................................... | 10 |
| ADJUSTMENT OF NEEDLE BAR HEIGHT ........................................................................... | 11 |
| CLEARANCE BETWEEN NEEDLEAND TIP OF HOOK ROTARY ........................................ | 12 |
| FEED DOG HEIGHT ............................................................................................................... | 13 |
| FEED DOGADJUSTMENT ..................................................................................................... | 14 |
| TOP TENSION | ........................................................................................................................ 15 |
| REPLACING THE ELECTRONIC COMPONENTS | |
| CIRCUIT BOARD-A CONNECTION........................................................................................ | 16 |
| SELF-DIAGNOSTIC TEST.............................................................................................. | 17 to 21 |
| PRINTED CIRCUIT BOARD A........................................................................................ | 22 |
| DRIVING MOTOR ................................................................................................................... | 23 |
| SWITCHING REGULATOR UNIT ........................................................................................... | 24 |
| ADJUSTING BUTTONHOLE LEVER POSITION.................................................................... | 25 |
| PARTS LIST ................................................................................................................... | 26 to 39 |
Table Caption: This table is a troubleshooting and maintenance guide, outlining procedures for changing external parts, making mechanical adjustments, replacing electronic components, and referencing a parts list, with corresponding page numbers for each section.
WHAT TO DO WHEN
**Table Caption: This table outlines common sewing machine issues, their causes, and corresponding
