3160QDC Service Manual
27 pages · 2.03 MB · PDF
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
| CONDITION | CAUSE | HOWTO FIX | REFERENCE |
|---|---|---|---|
| 1. SKIPPING STITCHES | 1. NEEDLE IS NOT INSERTED PROPERLY. 2. NEEDLE IS BENT OR WORN. 3. INCORRECTLY THREADED. 4. NEEDLE OR THREADARE INAPPROPRIATE FOR THE FABRIC BEING SEWN. 5. SEWING ON STRETCH FABRIC. 6. INAPPROPRIATE NEEDLE BAR HEIGHT. 7. INAPPROPRIATE NEEDLE TO HOOK TIMING. 8. INAPPROPRIATE NEEDLE TO HOOK CLEARANCE. | INSERT THE NEEDLE PROPERLY. CHANGE THE NEEDLE. RETHREAD. USE THE RECOMMENDED SEWING NEEDLEAND THREAD. USEAHAX #11 BLUE TIP NEEDLE. SEE MECHANICALADJUSTMENT 'ADJUSTMENT OF NEEDLE BAR HEIGHT'. SEE MECHANICAL 'ADJUSTMENT OF HOOK TIMING'. SEE MECHANICALADJUSTMENT 'CLEARANCE BETWEEN NEEDLE AND TIP OF THE ROTARY HOOK'. | P. 11 P. 10 P. 12 |
| 2. FABRIC NOT MOVING | 1. INCORRECT FEED DOG HEIGHT. 2. FEED DOG IS IN DOWN POSITION. 3. THREAD ON BOTTOM SIDE OF FABRIC IS JAMMED UP. | SEE MECHANICALADJUSTMENT 'FEED DOG HEIGHT'. RAISE THE FEED DOG. MAKE SURE TO BRING BOTH NEEDLE AND BOBBIN THREADS UNDER THE FOOT WHEN START SEWING. | P. 13 |
Table Caption: This table outlines common sewing machine issues, their causes, and corresponding solutions, along with page references for detailed instructions. It covers problems like skipping stitches and fabric not moving.
| CONDITION | CAUSE | HOWTO FIX | REFERENCE |
|---|---|---|---|
| 3. BREAKING UPPER THREAD. | 1. INITIAL SEWING SPEED IS TOO FAST. 2. THREAD PATH IS INCORRECT. 3. NEEDLE IS BENT OR DULL. 4. TOP TENSION IS TOO STRONG. 5. NEEDLE SIZE IS INAPPROPRIATE FOR FABRIC. 6. NEEDLE EYE IS WORN. 7. NEEDLE HOLE IN NEEDLE PLATE IS WORN OR BURRED. | START WITH MEDIUM SPEED. USE THE PROPER THREAD PATH. REPLACE WITHANEW NEEDLE. ADJUST TOP TENSION CORRECTLY. USEAPPROPRIATE NEEDLE FOR FABRICAND THREAD IN USE. CHANGE THE NEEDLE. REPAIR THE HOLE OR REPLACE THE NEEDLE PLATE. | |
| 4. BREAKING BOBBIN THREAD. | 1. BOBBIN HOLDER IS INCORRECTLY THREADED. 2. TOO MUCH THREAD IS WOUND ON THE BOBBIN. 3. LINT IS STUCK INSIDE THE BOBBIN HOLDER. 4. THREAD QUALITY IS TOO LOW. 5. THREAD IS JAMMINGAROUND | SET THE BOBBIN THREAD CORRECTLY. ADJUST THE POSITION OF BOBBIN WINDER STOPPER. CLEAN THE BOBBIN HOLDER. CHANGE TOAHIGH QUALITY SEWING THREAD. CLEAR OUT THE JAMMING THREAD. | |
| 5. NEEDLE BREAKS | 1. NEEDLE IS HITTING THE NEEDLE PLATE. 2. NEEDLE IS BENT OR WORN. 3. NEEDLE IS HITTING THE HOOK. 4. FABRIC IS BEING PULLED TOO STRONGLY WHILE SEWING. | SEE MECHANICALADJUSTMENT 'NEEDLE DROP POSITION'. CHANGE THE NEEDLE. SEE MECHANICALADJUSTMENT 'CLEARANCE BETWEEN NEEDLEAND TIP OF THE ROTARY HOOK'. GUIDE THE FABRIC GENTLY WHILE SEWING. | P. 9 P. 12 |
Table Caption: This table provides troubleshooting information for common sewing machine problems, detailing their causes and corresponding solutions, with references for further assistance.
Table Caption: This table lists common operational issues with their causes and recommended solutions, along with a reference page for further details. It covers problems like noisy operation and deformation patterns, offering specific troubleshooting steps.
FACE COVER
TO REMOVE:
- Remove the setscrew (A) and lift the face cover to disengage the rib on the inside. Remove the face cover (B).
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