Genius KYE Systems GHT-502 User manual

ServiceGuide GHT-502
Version : 2.0 Page 1 of 20
SERVICE GUIDE
KYE SYSTEMS CORP.
GHT-502
Version : 2.0

ServiceGuide GHT-502
Version : 2.0 Page 2 of 20
RevisionHistory
Version Date Change
1.0 08/27/2004
2.0 10/07/2004 Schematic Diagram

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Version : 2.0 Page 3 of 20
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 One or more channels no sound ………………..…7
1.2.2 Power LED (indicator) no light………………....…8
1.2.3 Volume , Bass no function...……………...………..8
Chapter 2. Specifications …………………………………………………………9
Chapter 3. Block Diagram ……………………………………………………….11
Chapter 4. Exploded View ……………………………………………………….12
Chapter 5. Part List ………………………………………………………………15
Chapter 6. Schematic Diagram …………………………………………………..17
Chapter 7. Important Notes ………………………………………………………19
7.1 Packing Requirement for Sending the PCB Assembly by Post …..19
7.2 Short of Spare Parts while Repairing a Speaker System …………19

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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 .

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Chapter 1. How to Handle Defective Returns
1.1 Overview
Verifying problems
Proceeding necessary tests
Receiving Defective speakers form
Customers
Analyzing possible malfunction
causes
Deciding & proceeding the
rectification methods
Replace necessary defective parts
Proceeding tests to
Ver if
y
if the s
p
eaker is
functionin
g
normall
y
Return the
speakers with proper
repackaging to customers
Function NG
Function OK
Function OK
Function NG

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1.2 Problems
Item Problem Description
1.2.1 One or more channels no sound
1.2.2 Power LED (indicator) no light
1.2.3 Volume , Bass no function

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Attention
1.2.1 One or more channels no sound
Problem
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 .
One or more channels no sound
Broken or short circuit
Defective U501-504 ,
U601-603 , U901,U301
Speaker cable dis-connect or
speaker damaged
Check solder points on
PCB
Check and Replace
defective IC
Re-connect speaker cable or
replace defective speaker(s)
Analyzer and
Identify the Causes

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1.2.2 Power LED (indicator) no light
Problem
Solutions
1.2.3 Volume , Bass no function
Problem
Solutions
Power LED (indicator) no light
Power switch or LED defective
DefectiveU601,U403,
D901-902
Dc cord of transformer
disconnected or defective
Re-solder or replace
defective component(s)
Analyzer and
Identify the Causes
Volume , Bass no function
Broken or short circuit
Defective K1 , U601-603,VR1 , VR2
Check solder points on PCB
Analyzer and
Identify the Causes
Check and Replace defective
components

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Chapter 2. Specifications
SATELLITE - Center(AT 1KHz)：
NO. Description Unit Specifications
1 Out Power at THD 10% W ≧7
2 Sensitivity mV 1100±300
3 Freq. Response (Ref:-3dB) Hz 30 ~ 9K
4 S/N ratio dB ≧75
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 620±200
3 Freq. Response (Ref:-3dB) Hz 150 ~ 20K
4 Separation dB ≧23
5 S/N ratio dB ≧68
6 Hum & Noise Vol: max mV ≦10
SATELLITE - Rear(AT 1KHz)：
NO. Description Unit Specifications
1 Out Power at THD 10% W 7 ±1
2 Sensitivity mV 200±100
3 Freq. Response (Ref:-3dB) Hz 170 ~ 17K
4 Separation dB ≧31
5 S/N ratio dB ≧68
6 Hum & Noise Vol: max mV ≦10

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Host(WOOFER)(AT 100Hz)：
NO. Description Unit Specifications
1 Out Power at THD 10% W 40 ±5
2 Sensitivity mV 150±100
3 Freq. Response (Ref:-3dB) Hz 20 ~ 140
4 S/N ratio dB
≧82
5 Hum & Noise Vol: max mV ≦10

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Chapter 3. Block Diagram
FR/FL -
RR/RL -AUDIO IN
CEN/SUB
-
Vo l u m e
Control
Power
Amplifier
FR.CH Speaker
RR.CH Speaker
Woof.CH Speaker
AC IN Transformer
Stand-By FL.CH Speaker
RL.CH Speaker
FILTER
CEN.CH Speaker
Power
Amplifier
Power
Amplifier

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Chapter 4. Exploded View
Host ( Woofer )

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Satellite

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Wired Remote Control

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Chapter 5. Part List
No. DESCRIPTION Qty UNIT Part No.
1 GHT-502/BODY/SATELLITE-FL 1 PC 3-101-01
2 GHT-502/BODY/SATELLITE-FR 1 PC 3-101-02
3 GHT-502/BODY/SATELLITE-RL 1 PC 3-101-03
4 GHT-502/BODY/SATELLITE-RR 1 PC 3-101-04
5 GHT-502/BODY/SATELLITE-CEN 1 PC 3-101-05
6 SPEAKER UNIT DBA218 5 PC 2-100-01
7 RUBBER, SW-FLAT2.1 1250/SATE. 10 PC 2-100-07
8 GHT-502/BODY/WOOFER/230V-EU 1 PC 3-101-06
9 SPEAKER UNIT 6.5” 4 ohm 40W 1 PC 3-100-01
10 PCBA, GHT-502 1 PC 3-101-07
11 IC, TDA7377, SW-Flat2.1 1250 1 PC 2-100-06
12 IC, TDA2030A, GHT-502 3 PC 3-100-02
13 IC, YG4558/MC4558, SW-Flat2.1 1250 1 PC 2-100-04/05
14 IC, LM324, GHT-502 1 PC 3-100-03
15 IC, TL084N, GHT-502 1 PC 3-100-04
16 IC, SC9235, GHT-502 3 PC 3-100-05
17 IC, L7808, GHT-502 1 PC 3-100-06
18 RUBBER, SW-Flat2.1 1250/HOST 4 PC 2-100-08
19 TRANSFORMER, 230V:13.4VACx2 & 3.7A 1 PC 3-100-07
20 REMOTE CONTROL, GHT-502 1 PC 3-101-08
21 AUDIO CABLE-1, 3 to 3 , GHT-502 1 PC 3-100-08
22 AUDIO CABLE-2(ORANGE), 1 to 2, GHT-502 1 PC 3-100-09
23 AUDIO CABLE-3(BLACK), 1 to 2, GHT-502 1 PC 3-100-10
24 AUDIO CABLE-4(GREEN), 1 to 2, GHT-502 1 PC 3-100-11
25 CARTON, GHT-502 1 PC 3-102-03
26 CUSHION, GHT-502 1 SET 3-102-02
27 Round Yellow Type Label ( ON CARTON ) 2 PC 2-102-04

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28 S/N LABEL ( ON CARTON & WOOFER) 2 PC 3-102-01
29 MANUAL, GHT-502 1 PC 3-102-04
30 PE BAG, SW-Flat2.1 1250/HOST 1 PC 2-102-07
31 PE BAG, SW-Flat2.1 1250/SATE. 5 PC 2-102-08
32 PE BAG, SW-Flat2.1 1250/REMOTE 1 PC 2-102-09
33 PE BAG, AUDIO CABLE 1 PC 3-102-05
34 CARDBOARD 1 PC 3-102-06

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Chapter 6. Schematic Diagram
AUDIO IN & REMOTE CONTROL

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POWER & AMPLIFIER

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VOLUME CONTROL

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Chapter 7. Important Notes
7.1 Packing Requirement for Sending the PCB Assembly by Post
PCB assembly is a kind of sophisticated electronic circuit board. Well
packing will be required when sending them by post.
* Some sophisticated IC components are mounted on the PCB assembly,
hence it is necessary to pack each PCB assembly with a separate static
protecting bag, in order to avoid static electricity.
* Reliable external packing is also very important when sending PCB
assembly by post, in that it would avoid unnecessarily lost or damage.
7.2 Short of Spare Parts while Repairing a Speaker System
If you are short of spare parts when you have some speaker systems waiting
to be repaired, it would be recommended to take the necessary parts form
one speaker system, so that you may have the as many speaker systems.