Janome MC9700 Service Manual

The Janome MC9700 is a high-performance computerized sewing machine featuring advanced stitch capabilities, automatic needle threading, built-in stitches, LCD display, speed control, automatic thread cutter, and various presser feet options. This service manual provides comprehensive technical information for qualified technicians including disassembly procedures, troubleshooting, maintenance, and repair instructions. Below are key sections for technical specifications, maintenance procedures, troubleshooting, and parts identification.

Technical Specifications

Key technical parameters and performance specifications for the Janome MC9700 sewing machine.

Specification	Description
Machine Type	Computerized Sewing Machine
Stitch Selection	Built-in stitches with LCD display
Stitch Width	Up to 7mm maximum
Stitch Length	Up to 5mm maximum
Needle System	HAx1 SP
Presser Foot	Automatic lift with height adjustment
Motor Type	DC Servo Motor
Power Requirements	120V AC, 60Hz
Weight	Approximately 26.5 lbs (12 kg)
Dimensions	18.1" x 8.3" x 12.2"

Safety Precautions

Essential safety guidelines for service technicians working on the Janome MC9700.

1. Always disconnect power before performing any service procedures.
2. Use proper tools and follow specified torque values for screws.
3. Wear safety glasses when working with springs or under tension components.
4. Handle circuit boards with anti-static precautions.
5. Ensure all safety guards are properly reinstalled after service.

WARNING! High voltage components present risk of electric shock. Only qualified technicians should perform electrical repairs.

Disassembly Procedures

Step-by-step instructions for disassembling the Janome MC9700 sewing machine.

1. Remove top cover: Remove 4 screws from top housing and lift cover carefully.
2. Remove front cover: Detach front panel by releasing clips and removing screws.
3. Access main board: Remove protective shield and disconnect connectors.
4. Remove motor assembly: Disconnect wiring and remove mounting bolts.
5. Disassemble needle bar mechanism: Remove timing belt cover and access needle bar components.

CAUTION! Document wire connections and component positions during disassembly for proper reassembly.

Electrical System

• Main PCB: Central control unit with microprocessor
• Power Supply: Switching power supply module
• Motor Control: DC servo motor with speed feedback
• Sensors: Optical position sensors for needle position
• Display: LCD module with backlight
• Control Panel: Membrane switch assembly
• Connectors: Standardized pin connectors for all subsystems
• Fuse Protection: 2A main fuse on power input

Mechanical Components

Detailed information about mechanical systems and their maintenance requirements.

Drive System: Timing belt drive from motor to main shaft, gear reduction for feed dog mechanism.

Needle Bar: Precision ground needle bar with bushings, connected to main shaft via crank mechanism.

Feed Dog: Adjustable feed mechanism with height and timing adjustments.

Hook Assembly: Rotating hook with bobbin case, requires precise timing with needle bar.

Tension System: Upper thread tension with disc mechanism, automatic thread tension control.

Troubleshooting Guide

Systematic approach to diagnosing and resolving common issues.

1. Begin with visual inspection for obvious damage or loose connections.
2. Check power supply output voltages before proceeding to other systems.
3. Verify motor operation independently from control system.
4. Test sensors and switches for proper operation.
5. Use diagnostic mode to check system parameters and error logs.

Tip: Always start with simplest possible causes before proceeding to complex diagnostics.

Maintenance Schedule

Recommended maintenance intervals and procedures for optimal performance.

1. Daily: Clean lint and dust from hook area and feed dogs.
2. Weekly: Oil hook race and needle bar mechanism with recommended lubricant.
3. Monthly: Check and adjust needle bar height and hook timing.
4. Quarterly: Clean and lubricate feed mechanism and motor bearings.
5. Annually: Complete inspection and calibration of all systems.
6. Bi-annually: Replace timing belt and check all mechanical wear points.

WARNING! Use only Janome-approved lubricants and replacement parts to maintain warranty and performance.

Parts Identification

Comprehensive parts list with identification numbers and descriptions.

Part Number	Description	Quantity
JNM-9700-001	Main Circuit Board Assembly	1
JNM-9700-002	DC Servo Motor Complete	1
JNM-9700-003	Needle Bar Assembly	1
JNM-9700-004	Hook Assembly Complete	1
JNM-9700-005	Timing Belt	1
JNM-9700-006	LCD Display Module	1
JNM-9700-007	Power Supply Board	1
JNM-9700-008	Control Panel Assembly	1

Calibration Procedures

Step-by-step calibration instructions for critical systems.

Needle Bar Timing: Adjust set screw on main shaft to synchronize needle bar with hook.

Thread Tension: Calibrate tension discs using digital tension gauge for consistent stitch quality.

Feed Dog Height: Adjust feed dog height for different fabric types and thicknesses.

Motor Speed: Calibrate speed control for accurate stitch per minute measurement.

Sensor Alignment: Adjust optical sensors for precise needle position detection.

Error Codes

Diagnostic error codes and their meanings for quick troubleshooting.

Error Code	Description	Resolution
E1	Motor overload protection	Check for mechanical binding, replace motor if necessary
E2	Needle position sensor error	Clean or replace optical sensor, check wiring
E3	Main PCB communication error	Reset machine, check connectors, replace main board
E4	Power supply voltage error	Check input voltage, replace power supply module
E5	Control panel communication error	Check ribbon cable, replace control panel

Reset Procedure: Turn machine off, press and hold specific keys while turning on to access reset mode.

Reassembly Instructions

Proper reassembly sequence and verification procedures.

1. Install mechanical components in reverse order of disassembly.
2. Verify all timing marks align before tightening set screws.
3. Connect electrical components following wiring diagrams.
4. Install covers and verify all fasteners are properly tightened.
5. Perform functional tests on all systems before returning to customer.

Final Testing: Run complete diagnostic cycle, test all stitch functions, verify tension and feed operation.

Service Support: Contact Janome Technical Support at 1-800-631-0183 for technical assistance.