Genius SP-HF1255A User manual

Service Guide SP-HF1255A

SERVICE GUIDE

KEY SYSTEM CORP

Service Guide SP-HF1255A

Revision History

Version Date Change

1.0 2009-12-22

Service Guide SP-HF1255A

Table of Contents

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

Table of contents……………………………………………………………....…3

Getting Start…………………………………………………….………………..4

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

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

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

1.2 Problem………………………………………………………………………6

1.2.1 No power，LED （indicator）unlighted………………………………...7

1.2.2 No sound…………………………………………………………….…….8

1.2.3 Right or left channel no sound….……….……….……….……..….…...…9

1.2.4 Noise………………………………….…………………………....…..…10

1.2.5 LED indicators no light…………………………….….……………...….11

1.2.6 Headphone jack output no sound……………………………..……...…..12

1.2.7 VR, headphone jack or line-in jack abnormal……..………….…...……..13

Chapter 2. Specification……………………………………………….….……14

Satellite……………………………………………………..…………….……14

Chapter 3. Block diagram…………………………………………..……...…..15

Chapter 4. Part list…………………………………… …………….………….16

Chapter 5 Important notes……………………………………………………...17

Chapter 6. Exploded view………………………………………………...……18

Right Satellite…………………………………………………..…….…...……18

Left Satellite…………………………………………………………………….19

Chapter 7 Schematic diagram……………………………………..…….………20

Service Guide SP-HF1255A

Getting Started

Conventions Used in the 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 handing 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.

Do not perform any maintenance with wet hand.

Prevent foreign substance, such as water, other liquids or chemical, from entering the speakers while

performing maintenance procedures on the speakers.

Service Guide SP-HF1255A

Chapter 1 How to Handle Defective Returns

1.1 Overview

Receiving Defective speaker from customers

FUNCTION NG

FUNCTION NG FUNCTION OK

FUNCTION OK

Verifying problems

proceeding necessary

tests

Analyzing possible, Main function cause

Deciding & Proceeding the Rectification

methods

Replace Necessary defective parts

Verifying problems

Proceeding Necessary

tests

Return the speakers with proper repacking to

customers

Service Guide SP-HF1255A

1.2 Problems

Item ItemProblemDescription

1.2.1 No power，LED （indicator）no light

1.2.2 No sound

1.2.3 Right or left channel no sound

1.2.4 Noise

1.2.5 LED indicator no light

1.2.6 Headphone jack output no sound

1.2.7 VR, headphone jack or line-in jack abnormal

Service Guide SP-HF1255A

Attention

1.2.1 No power, LED (indicator) unlighted

Problem

Analyze

and

identify

the

causes

Solutions

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.

Defective transformer

Defective or damaged AC

cable or power switch

Or caused by the following:

1. Transformer secondary wire loosely

connected with 1CN1 jack in

SP-HF1255AAMPA.

2. Copper foil of SP-HF1255A AMP

PCBA broken

Repair or replace Re-solder or replace

No power，LED （indicator）unlighted

Service Guide SP-HF1255A

1.2.2 No Sound

Problem

Analyze

and identify

thecauses

Solutions

No Sound

PCB

short-circuited,

dry soldered or

broken

CN1 and CN2 in

AMP board is not

properly connected

Or caused by the

following defective

components

1. U1, U2 in AMP

PCBA

2. VR1，N2，1CN4 in

SP-HF1255A AMP

PCBA

Repair or

Replace

Repair or

Replace

Repair,

re-solder or

Replace

Service Guide SP-HF1255A

1.2.3 Right or left channel no sound

Problem

Analyze

and identify

thecauses

Solutions

Right or left channel no sound

PCB damaged,

dry-soldered or

short-circuited;

CN1 in

SP-HF1255A

and CN2 in

SP-HF1255A

AMP PCBA

are loosely

connected

Driver unit or speaker

cable defective or

loosely connected

Audio cable defective

or loosely connected

VR ，N2 or 1CN4

defective in

SP-HF1255A AMP

PCBA

Repair or

Replace

Repair or

Replace

Re-connect,

replace or

repaire

Service Guide SP-HF1255A

1.2.4 Noise

Problem

Analyze

and identify

thecauses

Solutions

Noise

Filter capacitor

/diode

dry-soldered or

damaged,

please check

C1, C14, C31，

C20，C9, 1D1，

1D2,1D3, 1D4

in AMP

defective or

not;

The power

supply of each

IC is normal or

not

Or caused by

vibration from too

long lead wire of

driver units

Driver units damaged

Woofer cabinet leaks,

closed not well

Repair

Check and

replace

Repair or

replace

Table of contents

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