Janome 350E Repair Manual

The Janome 350E is a professional-grade embroidery machine featuring advanced stitching capabilities, automatic thread tension, built-in embroidery designs, USB connectivity, large embroidery area, LCD touchscreen display, automatic needle threader, and built-in memory for custom designs. This repair manual covers technical specifications, maintenance procedures, troubleshooting, disassembly instructions, and safety guidelines for qualified technicians.

1. Safety Precautions 2. Technical Specifications 3. Maintenance Procedures 4. Disassembly Instructions 5. Troubleshooting Guide 6. Parts Identification 7. Electrical System 8. Mechanical Systems 9. Software Diagnostics 10. Reassembly Procedures 11. Calibration & Testing

Safety Precautions

Before performing any repairs, ensure proper safety measures are followed to prevent injury and equipment damage.

Safety Measure	Description
Power Disconnection	Always unplug machine before servicing
Static Protection	Use anti-static wrist strap when handling electronic components
Needle Safety	Remove needle before disassembly to prevent puncture injuries
Tool Safety	Use proper tools; avoid excessive force during disassembly
Component Handling	Handle circuit boards by edges; avoid touching connectors
Work Area	Maintain clean, well-lit workspace with adequate ventilation
Lifting Procedure	Lift machine with assistance due to weight (approx. 15kg)
Electrical Testing	Use multimeter for voltage checks; follow electrical safety protocols
Lubrication Safety	Use only Janome-approved lubricants in specified areas
Reassembly Verification	Verify all components properly secured before power testing

Technical Specifications

Detailed technical specifications for the Janome 350E embroidery machine.

Machine Type: Computerized Embroidery Machine
Stitches per Minute: Up to 850 SPM
Embroidery Area: 200mm x 300mm
Built-in Designs: 150 embroidery designs
Memory: Built-in 2MB + USB expandable
Needle System: HAx1 SP
Thread Tension: Automatic and manual adjustment
Display: 5-inch LCD color touchscreen
Power Requirements: 110V AC, 60Hz
Dimensions: 550mm x 450mm x 350mm
Weight: 15kg

Maintenance Procedures

Regular maintenance procedures to ensure optimal performance and longevity.

Daily Cleaning: Remove lint and dust from bobbin area and feed dogs
Weekly Lubrication: Apply approved lubricant to hook race and moving parts
Monthly Inspection: Check needle bar, presser foot, and tension mechanisms
Quarterly Calibration: Verify stitch timing and needle position alignment
Annual Service: Complete disassembly, cleaning, and recalibration

WARNING! Use only Janome-approved cleaning solutions and lubricants. Improper maintenance may void warranty.

Disassembly Instructions

Step-by-step disassembly procedures for major components.

Remove top cover: Unscrew 6 Phillips head screws from top housing
Access main board: Remove front panel and disconnect ribbon cables
Remove needle assembly: Lower presser foot and unscrew needle bar clamp
Disassemble hook race: Remove bobbin case and unscrew hook race holder
Access motor assembly: Remove side panels and disconnect motor wiring
Remove LCD display: Carefully disconnect flex cable and mounting screws

CAUTION! Document screw locations and cable connections for proper reassembly.

Troubleshooting Guide

Common issues and their solutions for the Janome 350E.

Symptom	Possible Cause	Corrective Action
Machine not powering on	Power cord, fuse, main board	Check power connection; test fuse; inspect main board for damage
Thread breaking frequently	Tension, needle, thread path	Adjust tension; replace needle; check for burrs in thread path
Uneven stitching	Timing, feed dogs, presser foot	Check hook timing; inspect feed dogs; ensure proper presser foot pressure
LCD display issues	Ribbon cable, main board	Reseat display cable; test main board output; replace display if needed
Motor not running	Motor, drive board, sensors	Test motor windings; check drive board; inspect position sensors
USB not recognized	Port, cable, software	Clean USB port; try different cable; update firmware if available
Error codes displayed	Various system faults	Refer to error code chart in service manual; reset machine

Parts Identification

Key components and their part numbers for the Janome 350E.

Component	Part Number	Description
Main Circuit Board	JAN-350E-MB-01	Primary control board with processor
Stepper Motor	JAN-350E-SM-02	X-Y axis positioning motor
LCD Display Assembly	JAN-350E-LCD-03	5-inch color touchscreen display
Hook Race Assembly	JAN-350E-HR-04	Rotating hook and bobbin case
Power Supply Unit	JAN-350E-PSU-05	AC to DC conversion unit
Needle Bar Assembly	JAN-350E-NB-06	Complete needle bar mechanism
Feed Dog Mechanism	JAN-350E-FD-07	Fabric feeding system

Electrical System

Electrical components and testing procedures.

Power Supply: Input 110V AC, Output +5V, +12V, +24V DC
Main Board: 32-bit processor with 64MB RAM
Motor Drivers: Stepper motor controllers for precise positioning
Sensors: Optical position sensors, thread break detection
Testing Procedures: Use multimeter to verify voltages at test points
Fuse Replacement:2A slow-blow fuse located near power input

WARNING! Always disconnect power before testing electrical components.

Mechanical Systems

Mechanical components maintenance and adjustment.

Timing Adjustment: Align needle bar and hook race synchronization

Tension Calibration: Adjust upper and lower thread tension mechanisms

Feed Dog Height: Set proper feed dog clearance for fabric types

Presser Foot Pressure: Adjust spring tension for different materials

Needle Bar Alignment: Ensure vertical alignment and proper height

Software Diagnostics

Built-in diagnostic modes and software troubleshooting.

Service Mode Access: Power on while holding SET and RESET buttons

Motor Test: Verify all motor functions and positioning accuracy

Sensor Test: Check optical and mechanical sensor operation

Memory Test: Verify internal memory and USB functionality

Firmware Update: Procedure for updating machine software via USB

Error Log Access: View stored error codes and operational history

Reassembly Procedures

Proper reassembly sequence and verification steps.

Install mechanical components in reverse order of disassembly

Reconnect all electrical connectors securely

Install covers and verify proper fitment

Lubricate moving parts with approved lubricant

Perform initial power-on test without thread

Verify all functions before returning to customer

CAUTION! Test machine thoroughly before declaring repair complete.

Calibration & Testing

Final calibration and performance testing procedures.

Test Procedure Acceptance Criteria Tools Required

Stitch Quality Test Even stitches, no skipped stitches Test fabric, thread

Tension Balance Test Proper upper/lower thread balance Tension gauge

Positioning Accuracy ±0.1mm positioning tolerance Calibration grid

Speed Test Consistent 850 SPM operation Stopwatch, tachometer

Noise Level Test Below 65 dB during operation Sound level meter

Temperature Test Motor temperature below 60°C Infrared thermometer

Service Contact: Janome Technical Support: 1-800-JANOME-1 | www.janome.com/service

Janome 350E Repair Manual © - All Rights Reserved 2025

Test Procedure	Acceptance Criteria	Tools Required
Stitch Quality Test	Even stitches, no skipped stitches	Test fabric, thread
Tension Balance Test	Proper upper/lower thread balance	Tension gauge
Positioning Accuracy	±0.1mm positioning tolerance	Calibration grid
Speed Test	Consistent 850 SPM operation	Stopwatch, tachometer
Noise Level Test	Below 65 dB during operation	Sound level meter
Temperature Test	Motor temperature below 60°C	Infrared thermometer