Yamaha XS350 User Manual

1.97K-9636 1.69K-545 Printed in Japan '99.1
CONTENTS
SPECIFICATIONS .................................................................. 3
PANEL LAYOUT .................................................................... 4
DIMENSIONS ........................................................................ 5
BLOCK DIAGRAM ................................................................. 5
CIRCUIT BOARD LAYOUT & WIRING .................................. 6
DISASSEMBLY PROCEDURE ............................................... 7
IC BLOCK DIAGRAM .............................................................10
CIRCUIT BOARDS .................................................................11
INSPECTIONS .......................................................................13
PARTS LIST
SERVICE MANUAL
POWER AMPLIFIER
XS250/350
PA
011440

Yamaha XS350 Specifications

General

Brand	Yamaha
Model	XS350
Category	Amplifier
Language	English

Summary

Specifications

General Specifications XS250/XS350

Detailed technical specifications for both models.

Panel Layout

Front Panel Layout

Rear Panel Layout

Disassembly Procedure (Part 1)

Top Cover and Transformer Removal

Steps for removing the top cover and power transformer.

Circuit Board and Fan Removal

Steps for removing various circuit boards and the DC fan.

Disassembly Procedure (Part 2)

PA7 Unit and Circuit Board Removal

Steps for removing the PA7 unit and its circuit board.

Disassembly Procedure (Part 3)

Rear Assembly and SUB 5/5 Board Removal

Steps for removing rear assembly and SUB 5/5 circuit board.

Circuit Boards Identification

Inspections - Setup and Initial Tests

Setup and Fan/Muting/Idle Current/DC Offset Tests

Setup conditions and procedures for initial tests like fan, muting, idle current, and DC offset.

Gain and Frequency Response Tests

Procedures for testing amplifier gain and frequency response.

Inspections - Performance Tests

Harmonic Distortion, Channel Separation, Noise, Stability Tests

Protection and PC Limiter Tests

Inspections - Bridge Mode and Final Settings

Signal Indicator and Bridge Mode Setup

Bridge Mode Performance Tests

Parts List Introduction

Notes on Parts List Sections

Electrical Parts List

List of Electrical Components

Overall Circuit Diagram

Complete Amplifier Circuit Schematic