KYE Systems Corp. Genius SP-N120 User manual

Service Guide SP-N120
Version : 1.0 Page 1 of 15
SERVICE GUIDE
KYE SYSTEMS CORP.
SP-N120

Service Guide SP-N120
Version : 1.0 Page 2 of 15
Version : 1.0
Revision History
Version Date Change
1.0 09/20/2007

Service Guide SP-N120
Version : 1.0 Page 3 of 15
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 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

Service Guide SP-N120
Version : 1.0 Page 4 of 15
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 .

Service Guide SP-N120
Version : 1.0 Page 5 of 15
Chapter 1. How to Handle Defective Returns
1.1 Overview
Receiving Defective speaker form customers
Analyzing possible
malfunction causes
Deciding & proceeding the
rectification methods
Replace necessary
defective
p
arts
Return the speakers with proper
re
p
acka
g
in
g
to customers
Verifying problems
proceeding
necessar
y
tests
Proceeding tests to
verify if the speaker is
functionin
g
normall
y
Function OK
Function NG
Function OKFunction NG

Service Guide SP-N120
Version : 1.0 Page 6 of 15
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 no function

Service Guide SP-N120
Version : 1.0 Page 7 of 15
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 IC
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

Service Guide SP-N120
Version : 1.0 Page 8 of 15
1.2.2 Power LED (indicator) no light
Problem
Solutions
1.2.3 Volume no function
Problem
Solutions
Power LED (indicator) no light
Power switch or LED defective
Defective SW, R11,
R12,T2,D1,D2,D3,D4
Ac cord of transformer
disconnected or defective
Re-solder or replace
defective component(s)
Analyzer and
Identify the Causes
Volume no function
Broken or short circuit Defective R1, ,R2, R5,R6,VR,
C5,C6,IC
Check solder points on PCB
Analyzer and
Identify the Causes
Check and Replace defective
components

Service Guide SP-N120
Version : 1.0 Page 9 of 15
Chapter 2. Specifications
NO. Description Unit Specifications
1 Out Power at THD 10% W >
>
>
0.9
2 Sensitivity mV 400 ±50
3 Freq. Response (Ref:-3dB) Hz 110Hz ~ 20KHz
4 Separation dB 40
BdoitarN/S5 45
6 Hum & Noise (Vol.: max) mV < 3

Service Guide SP-N120
Version : 1.0 Page 10 of 15
Chapter 3. Block Diagram
AUDIO IN
Volume
Increase Power
Amplifier
R.CH Speaker
AC IN
L.CH Speaker
Volume
Decrease
Power
Conditioner