KYE Systems Corp. Genius SP-120 User manual

Service Manual SP-120
Service Manual
KEY SYSTEM CORP
Page:1 of 18Version No.：1.0

Change History：
Version Date
1.0
Revision
Service Manual SP-120
Version No.：1.0 Page:2 of 18
2011-8-18

Chapter IV: Assembly drawing………………………………………….15-16
Satellite speaker…………………………………………………………….15
Chapter VI: Schematic circuit diagram………………………………….18
Version No.：1.0 Page:3 of 18
Main speaker………………………………………………………………….16
Chapter V: Parts list……………………………………………………….17
Satellite speaker…………………………………………………………….17
Main speaker………………………………………………………………….17
1.2.6 No sound output, though the headphone jack is inserted….12
Chapter II: Product specifications………………………………………13
Main/sub-speaker…………………………………………………………….13
Chapter III: Flowchart …………………………………………………….14
Starting to use…………………………………………………………………4
User guide……………………………………………………………………..4
1.2.4 Hum and current noise…………………………………………….10
1.2.5 Power light is off………………………………………………..11
1.2.2 No sound …………………………………………………………..8
1.2.3 Left or right channel error…………………………………….9
Table of Contents：
Safety instruction…………………………………………………………..4
Chapter I: How to dispose the rejected products………………………5
1.2 Errors…………………………………………………………………….6
1.2.1 No power and indicator is off…………………………………..7
File version …………………………………………………………………..2
Contents………………………………………………………………………….3
Service Manual SP-120

Prevent foreign objects going into the subwoofer via the inverted tube;
otherwise, it may cause electric shock or fire;
Version No.：1.0 Page:4 of 18
Put the speaker far away from other electric appliances, so as to realize
heat dissipation better;
Please strictly follow the rules below when working with the speaker:
Place the speaker levelly and do not expose to harmful and corrosive
atmosphere (with smoke, vibration, salt or oil), as well as smog;
Never throw or strike the speaker;
Safety instruction：
User guide：
Important: This instruction is intended to keep in mind and prevent errors.
Warning: The information prohibited may damage the product.
Service Manual SP-120
Do not use wet hands and prevent foreign objects entering the speaker
Starting to use
during maintenance, such as water or other chemical fluids.

1.1 Overview
Functional test with error
Version No.：1.0 Page:5 of 18
Service Manual SP-120
Chapter I. How to dispose the rejected products
Test is OKTest NG
Receive the rejected speaker
from customer
Replace some parts of the rejected
if necessary
Figure out practicable
maintenance
Analyze potential
causes
Repack the qualified product
and send to the customer
Verify and implement
test if necessary
Test again

1.2.1
1.2.2
1.2.3
1.2.4
1.2.5
1.2.6 There is no sound output,though the headphone
1.2 Errors
Service Manual SP-120
Description
NO power and indicator is off
NO sound
Left or right channel error
Hum and current noise
LED indicator is off
jack is inserted.
Version No.：1.0 Page:6 of 18

1.2.1 No power and LED indicator is off
For maintenance, please take the sequence of single flow chart
below.
Service Manual SP-120
It is the optimal sequence recommended for solution.
*Notice
Version No.：1.0 Page:7 of 18
No power/LED
indicator is off
1.The power plug is out
of contact; 2.2P
cables are set
improperly;
3.The transformer is
defective;
4.The key switch is
defective.
1.Welding of power cord onto the
transformer is bad;
2.The power plug is out of
contact;
3.The transformer is damaged,
open circuit (cable is broken);
4.CON4 plug becomes loose and
copper foil is broken;
5.Connecting wire of CON4 is open
circuit;
6.LED indicator is bad or
damaged;
7.The key switch is defective.
Inspect/repair Inspect/repair/repl
ace

Page:8 of 18
Service Manual SP-120
1.2.2 No sound
Version No.：1.0
No sound
1.It is due to PCB
short circuit /open
circuit/no
electricity;
2.The connecting
wire is inferior or
damaged, short
circuit/open circuit
CON1/CON2/CON3
1.J2/J3/D10/Q2 is bad
or damaged;
2.Potentiometer
VR1 is damaged;
3.PCB plug becomes
loose, or in poor
contact;
4.Headphone jack JK1
is bad or damaged.
Inspect/repair Inspect/repair/replace
1.PCB sound channel
unit elements are
damaged. Speaker and
lead of U1，
JK1,C11,VR1,J2,J3，
Q1,Q2,Q3 and D10 are
damaged.
Inspect/repair

Service Manual SP-120
1.2.3 Left or right channel error
Version No.：1.0 Page:9 of 18
Left/right channel error
1.PCB is short
circuit/open circuit,
or damaged;
2.JK1 headphone jack
is bad or damaged;
3.Signal input line of
left/right channel is
bad or damaged;
4.Signal output line
of left/right channel
is bad or damaged.
1.Speaker of
left/right channel
is bad or damaged;
2.Signal output
line of left/right
channel is not set
properly.
Inspect/repair/repl
ace Inspect/repair
1.Left/right
channel cell
circuit of
U1,JK1,Q1,Q3,C20,C2
1,VR1,
CON2/CON3/CON1 is
short circuit/open
circuit, or
damaged.
Replace/repair

1.2.4 Hum and current noise
Service Manual SP-120
Version No.：1.0 Page:10 of 18
Hum and current
noise
Power supply is
poor; filter
capacitor C22 is
damaged to cause
abnormal
interference of
voltage ripple by
power supply IC; PCB
is affected with
damp, polluted or
broken.
Signal earth line
of CON1 is bad
contact.
Inspect/repair/replace Inspect/repair/replace
JK1 headphone jack
pin is with false
welding; copper
foil is broken;
potentiometer is
in use for long
time; spring is
bad contact when
turning knob.
Replace/repair