KYE Systems Corp. GHT-502D Manuale utente

ServiceGuide GHT-502D

SERVICE GUIDE

KYESYSTEMS CORP.

GHT-502D

Version : 1.0

Version : 1.0 Page 1 of 18

ServiceGuide GHT-502D

RevisionHistory

Version Date Change

1.0 11/05/2004

Version : 1.0 Page 2 of 18

ServiceGuide GHT-502D

Table of Contents

Revision History …………………………………………………………………….2

Table of Contents ……………………………………………………………………3

Getting Started ………………………………………………………………………4

Conventions Used in this Guide ……………………………………….4

Safety Precautions ……………………………………………………..4

Chapter 1. How to Handle Defective Returns……………………………………..5

1.1 Overview …………………………………………………………..5

1.2 Problems …………………………………………………………...6

1.2.1 FL/FR, RL/RR channels no sound …………………7

1.2.2 CEN channel no sound………….……………....…8

1.2.3 Woofer channel no sound....……………...………..8

1.2.4 Decoder no power…………………………………9

Chapter 2. Specifications …………………………………………………………10

Chapter 3. Block Diagram ……………………………………………………….12

Chapter 4. Exploded View ……………………………………………………….13

Chapter 5. Part List ………………………………………………………………15

Chapter 6. Schematic Diagram …………………………………………………...17

Chapter 7. Important Notes ………………………………………………………18

7.1 Packing Requirement for Sending the PCB Assembly by Post …..18

7.2 Short of Spare Parts while Repairing a Speaker System …………18

Version : 1.0 Page 3 of 18

ServiceGuide GHT-502D

Getting Started

Conventions Used in this Guide

Pay Special Attention : Instructions that are important to remember and

may prevent mistakes .

Caution : Information that, if not followed, may result in damage to the

product .

Safety Precautions

The following precautions should be observed in handling the speaker

Described in this guide :

Place the speakers on a flat, level and stable surface.

Do not place the speakers in environments subject to mist, smoke,

vibration, excessive dust, salty or greasy air, or other corrosive gases

and fumes.

Do not drop or jolt the speakers.

Do not allow anything to drop into the subwoofer case through its

ventilator, as it could result in fatal electric shock or fire .

Place the unit far enough from other equipments for good heat

dissipation .

Disconnect the AC power cord from the AC outlet before performing

any maintenance on the speakers .

Do not perform any maintenance with wet hand .

Prevent foreign substances, such as water, other liquids or chemicals ,

From entering the speakers while performing maintenance procedures

on the speakers .

Version : 1.0 Page 4 of 18

ServiceGuide GHT-502D

Chapter 1. How to Handle Defective Returns

1.1 Overview

Version : 1.0 Page 5 of 18

Verifying problems

Proceeding necessary tests

Receiving Defective speakers from

Customers

Analyzing possible malfunction

causes

Deciding & proceeding the

rectification methods

Replace necessary defective parts

Proceeding tests to

Verif

if the s

eaker is

functionin

normall

Return the speakers with proper

repackaging to customers

Function NG

Function OK

Function NG

ServiceGuide GHT-502D

1.2 Problems

Item Problem Description

1.2.1 FL/FR, RL/RR channels no sound

1.2.2 CEN channel no sound

1.2.3 Woofer channel no sound

Version : 1.0 Page 6 of 18

1.2.4 Decodernopower

ServiceGuide GHT-502D

Attention

1.2.1 FL/FR , RL/RR channels no sound

Problem

Solutions

Version : 1.0 Page 7 of 18

Please follow the numbered sequence marked within parenthesis given in individual

Flow chat, in that this is the best-recommended sequence to rectify the problems .

FL/FR,RL/RR channels no sound

Broken or short circuit

Defective C505-508,U501 ,

C501-C504,U901

Speaker cable dis-connect or

speaker damaged

Check solder points on

PCB

Check and Replace

defective IC or

Component

Re-connect speaker cable or

replace defective speaker(s)

Analyzer and

Identify the Causes

ServiceGuide GHT-502D

1.2.2 CEN channel no sound

Problem

Solutions

1.2.3 Woofer channel no sound

Problem

Solutions

Version : 1.0 Page 8 of 18

CEN channel no sound

Broken or short circuit

Defective IC301 ,U901,IC502

C614,C618

Speaker cable dis-connect or

speaker damaged

Check solder points on

PCB

Check and Replace

defective IC or

Component

Re-connect speaker cable or

replace defective speaker(s)

Analyzer and

Identify the Causes

Woofer channel no sound

Broken or short circuit

Defective IC503,IC504,TC301

Q814,C614,C618

Speaker cable dis-connect or

speaker damaged

Check solder points on

PCB

Check and Replace

defective IC or

Component

Re-connect speaker cable or

replace defective speaker(s)

Analyzer and

Identify the Causes

ServiceGuide GHT-502D

1.2.4 Decoder no power

Problem

Solutions

Version : 1.0 Page 9 of 18

Decoder no power

Broken or short circuit

Defective D1-D4,IC1,C197

Speaker cable dis-connect or

speaker damaged

Check solder points on

PCB

Check and Replace

defective IC or

Component

Re-connect speaker cable or

replace defective speaker(s)

Analyzer and

Identify the Causes

ServiceGuide GHT-502D

Chapter 2. Specifications

Satellite - Center(AT 1KHz)：

NO. Description Unit Specifications

1 Out Power at THD 10% W 7 ±1

2 Sensitivity mV 1400 ±300

3 Freq. Response (Ref:-3dB) Hz 28 ~ 9.5K

4 S/N ratio dB ≧70

5 Hum & Noise Vol: max mV ≦10

Satellite - Front(AT 1KHz)：

NO. Description Unit Specifications

1 Out Power at THD 10% W 7 ±1

2 Sensitivity mV 670±200

3 Freq. Response (Ref:-3dB) Hz 145 ~ 20K

4 Separation dB ≧40

5 S/N ratio dB ≧70

6 Hum & Noise Vol: max mV ≦10

Satellite - Rear(AT 1KHz)：

Version : 1.0 Page 10 of 18

NO. Description Unit Specifications

1 Out Power at THD 10% W 7 ±1

2 Sensitivity mV 400±100

3 Freq. Response (Ref:-3dB) Hz 170 ~ 15K

4 Separation dB ≧40

5 S/N ratio dB ≧70

6 Hum & Noise Vol: max mV ≦10

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