The Janome 3160QDC is a computerized sewing machine with 60 built-in stitches, one-step auto buttonhole, automatic needle threader, drop feed for free-motion sewing, built-in thread cutter, and top-loading bobbin system. This repair manual covers disassembly, troubleshooting, maintenance procedures, and technical specifications for qualified technicians.
Before performing any repairs, ensure machine is unplugged from power source. Use proper tools and follow electrostatic discharge (ESD) precautions when handling electronic components.
| Safety Measure | Description |
|---|---|
| Power Disconnection | Always unplug machine before servicing |
| ESD Protection | Use anti-static wrist strap when handling PCBs |
| Tool Safety | Use insulated tools for electrical work |
| Component Handling | Handle circuit boards by edges only |
| Test Environment | Work on clean, dry, well-lit surface |
Follow steps in sequence to avoid damage to components.
WARNING! Document screw locations and cable routing for reassembly.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No power | Power cord, fuse, main PCB | Check power cord connection; test fuse F1; verify PCB power supply |
| Motor not running | Motor brushes, control board | Inspect motor brushes; test motor control circuitry |
| Stitch skipping | Needle, timing, hook | Replace needle; check hook to needle timing |
| Thread breaking | Tension, burrs, threading | Adjust tension; inspect for burrs; rethread properly |
| Error codes displayed | Sensor failure, PCB issue | Refer to error code chart; test sensors |
Regular maintenance prevents common issues and extends machine life.
Note: Use only Janome approved lubricants and parts.
Key components and their part numbers for ordering replacements.
| Component | Part Number | Description |
|---|---|---|
| Main PCB | JNM-3160-MAIN | Primary control board |
| Motor Assembly | JNM-DC-MTR-60 | DC servo motor with controller |
| Hook Assembly | JNM-3160-HOOK | Rotating hook with race |
| Power Supply | JNM-PS-110V | AC to DC converter |
| Display Panel | JNM-3160-DISP | LCD stitch selection display |
Reference diagrams for electrical troubleshooting. Main PCB includes power supply, motor control, and user interface circuits.
Power Circuit: Fuse F1 (2A), bridge rectifier, voltage regulators
Motor Control: PWM controller, current sensing, speed feedback
User Interface: Microcontroller, button matrix, LCD driver
CAUTION! High voltage present in power supply section.
Required after component replacement or timing adjustment.
Reverse disassembly procedure, ensuring proper alignment and connection.
Tip: Test machine before final screw tightening.
Comprehensive testing after repair completion.
| Test | Procedure | Expected Result |
|---|---|---|
| Power Up | Connect power, turn on | Display lights, no error codes |
| Motor Operation | Press foot control | Smooth acceleration, consistent speed |
| Stitch Selection | Cycle through stitches | Proper pattern display and formation |
| Tension Test | Sew on test fabric | Balanced stitches, no looping |
| Buttonhole | Test auto buttonhole | Consistent size, proper formation |
For technical support, parts ordering, and service training.
Janome America: 1-800-631-0183
Technical Support: [email protected]
Parts Department: [email protected]
Online Resources: www.janome.com/service
Service Centers: Authorized locations listed on website