Yamaha JW-II User Manual

SERVICE MANUAL
[XA41, XA42, XA43]
XA4-28197-00 (English)
Electric power-assist unit for wheelchairs
This manual has been compiled as a guide to installing the on commer-
cial wheelchairs, and providing after-sales service. Information which dupli-
cates that contained in the
Service Manual has been omitted.

Yamaha JW-II Specifications

General

Type	Electric Wheelchair
Drive System	Rear-wheel drive
Maximum Speed	6km/h
Maximum User Weight	100 kg
Backrest Height	450mm
Wheel Size	Front: 200 mm

Summary

Introduction

JW-II Model Variations

Details on different JW-II model variations and their specifications.

Principal Specifications

Key technical specifications of the JW-II power-assist unit, including weight, dimensions, and performance.

Tightening Torques for Principal Portions

Installation Preparation

Basic Judgment on Applicability

Installation Adjustments

Procedures for adjusting battery bracket, main switch, stoppers, and clamp bracket.

Installation Procedure

Detachable Wheel Type Installation

Step-by-step guide for installing the JW-II on detachable wheel wheelchairs.

Fixed Wheel Type Installation

Step-by-step guide for installing the JW-II on fixed wheel wheelchairs.

Inspection and Adjustment After Installation

Inspection and Adjustment Points

Key points for inspection and adjustments after the JW-II is installed.

Service at Delivery

Explaining JW-II Operation to User

Battery

Nickel Hydrogen Battery Characteristics

Battery Functions

Service Mode and Diagnosis

Battery Failure Analysis

Diagnostic steps for issues like no capacity display or inability to charge.

Battery Charger

Diagnosing Charger Communication Issues

After Service

LED Warning Light Troubleshooting

Adjusting Sensor After Wheel Replacement

Procedures for neutral adjustment of the sensor when replacing a wheel assembly.