Service Guide SW-5.1 1020
Service Guide
KEY SYSTEM CORP
Version No. 1.0 Page 1 of 24
Service Guide SW-5.1 1020
Modification Record:
Version Date Modification
1.0 2011-10-19
Version No. 1.0 Page 2 of 24
Service Guide SW-5.1 1020
Contents
Document Version ............................................................................................................................ 2
Contents............................................................................................................................................ 3
Use.................................................................................................................................................... 4
Use Guide .................................................................................................................................. 4
Safety Caution ........................................................................................................................... 4
Chapter 1: How to Dispose Returned Defective Products ............................................................... 5
1.2 Troubles............................................................................................................................... 6
1.2.1 No Power and Indicator Lamp Inoperative ............................................................... 7
1.2.2 No Sound................................................................................................................... 8
1.2.3 No Sound from Front Left or Right Channel ............................................................ 9
1.2.4 No Sound from Rear Left or Right Channel ........................................................... 10
1.2.5 No Sound from Middle Channel ............................................................................. 11
1.2.6 No Bass.................................................................................................................... 12
1.2.7 Noise and Current Noise ......................................................................................... 13
1.2.8 Earphone Socket Inoperative................................................................................... 14
1.2.9 Noice Bass Potentiometer ....................................................................................... 15
1.2.10 VOL (Volume) Inoperative.................................................................................... 16
Chapter 2 Product Specifications ................................................................................................... 17
2.1 Satellite....................................................................................................................... 17
2.2 Subwoofer ................................................................................................................ 17
Chapter 3 Block Diagram............................................................................................................... 18
Chapter 4 Rendering after Assembly......................................................................................... 19-20
Satellite .................................................................................................................................. 19
Subwoofer ............................................................................................................................. 20
Chapter 5 Material List..............................................................................................................21-22
Satellite .................................................................................................................................. 21
Subwoofer .............................................................................................................................. 22
Chapter 6 Electric Schematic Diagram ..................................................................................... 23-24
Version No. 1.0 Page 3 of 24
Service Guide SW-5.1 1020
Use
Use Guide
Special Attention: this guide contributes to remember and prevent errors.
Warning: if information does not allow, it is possible to cause the product damaged.
Safety Caution:
This guide requires the cautions given below should be followed during operation of the speaker:
Flatly place the product and don’t place the speaker in such hostile environments as smoke,
vibration, air containing salt or oil, or other corrosive air or smoke;
Don’t knock the speaker
Don’t make any item to fall into the subwoofer from the phase guiding barrel; otherwise it is
possible to cause electric shock or fire.
Try best to keep away from other electric equipment to provide better heat dissipation;
Prevent such foreign matters as water or other chemical liquids from entering the speaker during
maintenance of the speaker.
Version No. 1.0 Page 4 of 24
Service Guide SW-5.1 1020
Chapter 1: How to Dispose Returned Defective Products
1.1 General
Receive the speaker returned by a consumer
Verify the trouble
and necessar
y
test
Find out troubles in a function test
Analyze possible causes for the troubles
Test O k
Test NG
Replace some defective parts to be necessarily replaced
Retest
Return the qualified product to the consumer after repacking.
Version No. 1.0 Page 5 of 24
Decide an effective repair service scheme
Service Guide SW-5.1 1020
1.2 T r oubles
Description of troubles
1.2.1 No Power and Indicator Lamp Inoperative
1.2.2 No Sound
1.2.3 No Sound from Front Left or Right Channel
1.2.4 No Sound from Rear Left or Right Channel
1.2.5 No Sound from Middle Channel
1.2.6 No Bass
1.2.7 Noise and Current Noise
1.2.8 Earphone Socket Inoperative
1.2.9 Noise from Bass Potentiometer
1.2.10 VOL (Volume) Inoperative
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Service Guide SW-5.1 1020
Version No. 1.0 Page 7 of 24
* Note:
Please follow the sequence of single flow chart.
The flow chart is the optimal sequence recommended for removal of the troubles.
1.2.1 No Power and LED Lamp Inoperative
No Power/LED lamp
inoperative
1. Switching power panel
defective or damaged
2. Power switch defect and
damaged
Causes given below
1. Poor contact between the power line and the plug
due to deformation resulting from external force;
2. Fuse F1 broken due to power protection resulting
from the damage and the short circuit of power
amplifier IC
3. Defect of and poor contact between the switching
power panel CN2 and the plug
4. Open circuit resulting from power copper foil broken
due to the defect of the power amplifier panel
5. D12 5.1V voltage stabilizer damaged
6. LED lamp defective and damaged
Inspect/ repair
Inspect/ repair/ replace
Service Guide SW-5.1 1020
1.2.2 No Sound
Version No. 1.0 Page 8 of 24
No Sound
1. Circuit board U6
damaged or defective
2. Abnormal power voltage
of power panel
Causes given below
Power fault of U6 resulting from
SW-5.1 1020 PCB D6, R59, C81.
Inspect/ repair/ replace
Inspect/ repair/ replace
1. JK5 defective or damaged
2. VR2 Potentiometer defective
or damaged
Replace/ repair
Service Guide SW-5.1 1020
1.2.3 No Sound from Front Left or Right Channel
Version No. 1.0 Page 9 of 24
No sound from front left or
right channel
1. Short circuit or open
circuit of PCB for front
left and right channel
2. JK3, JK5 earphone input
socket defective or
damaged
Such elements damaged as C28,
C29, and U1
Inspect/ repair/ replace
Inspect/ repair/ replace
1. Output RCA socket defective
or damaged
2. Power failure of U1 power
amplifier, power copper foil
broken
Replace/ repair
Service Guide SW-5.1 1020
1.2.4 No Sound from Rear Left or Right Channel
Version No. 1.0 Page 10 of 24
No sound from rear left or
right channel
1. Short circuit or open
circuit of PCB for rear
left and right channel
2. JK2 earphone input
socket defective or
damaged
Such elements damaged as C30,
C31, and U2
Inspect/ repair/ replace
Inspect/ repair/ replace
1. Output RCA socket defective
or damaged
2. Power failure of U2 power
amplifier, power copper foil
broken
Replace/ repair
Service Guide SW-5.1 1020
1.2.5 No Sound from Middle Channel
Version No. 1.0 Page 11 of 24
No sound from middle
channel
1. Short circuit or open
circuit of PCB for middle
channel
2. JK4 earphone input
socket defective or
damaged
Such elements damaged as C32
and U3
Inspect/ repair/ replace
Inspect/ repair/ replace
1. Output RCA socket defective
or damaged
2. Power failure of U3 power
amplifier, power copper foil
broken
Replace/ repair
Service Guide SW-5.1 1020
1.2.6 No Bass
Version No. 1.0 Page 12 of 24
No bass
1. Short circuit or open
circuit of PCB for bass
channel
2. JK4 earphone input
socket defective or
damaged
Such elements damaged as D5,
D7, U4 and U5
Inspect/ repair/ replace
Inspect/ repair/ replace
1. Output socket CON1
defective or damaged
2. Power failure of U4 and U5
IC, power copper foil broken
3. VR1 potentiometer defective
or damaged
Replace/ repair
Service Guide SW-5.1 1020
1.2.7 Noise and Current Noise
Version No. 1.0 Page 13 of 24
Noise and current noise
1. Switching power supply
panel damaged.
2. Incomplete power filter:
such capacitor
inoperative or damaged
as C72, C73, C74, C80,
C81, C82, C83, C20,
C24, C27, C17, C25, and
C21
Such elements damaged as D6,
R59, D5, D7, U1, U2, U3, U4, U5
and U6
Inspect/ repair/ replace
Inspect/ repair/ replace
1. Bass potentiometer defective
or damaged
2. Power failure of U6
Replace/ repair
Service Guide SW-5.1 1020
1.2.8 Earphone Socket Inoperative
Version No. 1.0 Page 14 of 24
Earphone socket inoperative
1. Earphone socket damaged or
inoperative
2. Short circuit or open circuit of
copper foil for circuit board
Replace/ repair
Service Guide SW-5.1 1020
1.2.9 Noise from Bass Potentiometer
Version No. 1.0 Page 15 of 24
Noise from bass
potentiometer
1. Bass potentiomete
r
defective or damaged
2. PCB C49 and C52 defective
or damaged
Replace/ repair
Service Guide SW-5.1 1020
1.2.10 VOL (Volume) Inoperative
Version No. 1.0 Page 16 of 24
VOL inoperative
1. VR2 potentiomete
r
defective or damaged
2. Power failure of U6 volume
integrated circuit
3. Broken circuit/ short circuit of
PCB
4. Such elements damaged as
D6, R59, JK5 and U6
Replace/ repair
Service Guide SW-5.1 1020
Version No. 1.0 Page 17 of 24
Chapter 2 Product Specifications
Service Guide SW-5.1 1020
Chapter 3 Block Diagram
Version No. 1.0 Page 18 of 24
FL Signal input
Calculation amplification
JRC4558
Bass tuning
Electronic volume control SJ3358
Power amplification
TDA2030A
Power amplification
TDA2030
Power amplification
TDA2025B
Volume tuning
FR Signal input
CEN Signal input
SL Signal input
SR Signal input
USB Signal input
Earphone input
Power supply
Power amplification
TDA2030
FL output
FR output
SL output
SR output
CEN output
SUB output
Service Guide SW-5.1 1020
Chapter 4 Rendering after Assembly
Subwoofer
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Service Guide SW-5.1 1020
Satellite
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Service Guide SW-5.1 1020
Chapter 5 Material List
Subwoofer
Ref. NO Description Part NO.
1 KNOB AMP024502. 00G
2 FRONT PANEL AMP024501. 00G
3 VOLUME PCBA ASP024501. G01
4 WRAP BOARD AHB024501. 00G
5 AMPLIFIER PCBA ASP024502. G01
6 IC SJ3358 DIP18 AEU000130. 00G
7 IC TEA2025B AEl'000001. 04G
8 METAL BAR AMB000006. 00G
9 BACK BOARD AHB024502. 00G
10 RUBBER FOOT AHR000066. 00G
11 SPEAKER AMK440028. 00G
12 IC JRC4558D AEU000008. 00G
13 IC TDA2030A AEU000006. 02G
14 AL HEAT AHS000057. 00G
15 FE HEAT AHS000035. 00G
16 5RCA SOCKET ANJ000096. 00G
17 POWER PCBA AEM100026. 00G
Version No. 1.0 Page 21 of 24
Service Guide SW-5.1 1020
Satellite
Ref. NO Description Part NO.
1 FRONT CABINET AMP024402. 00G
2 SPEAKER AMK340064. 00G
3 SEALING COVER AMP724404. 00G
4 BACK CABINET AMP724403. 00G
Version No. 1.0 Page 22 of 24
Service Guide SW-5.1 1020
Version No. 1.0 Page 23 of 24
Chapter 6 Electric Schematic Diagram
Service Guide SW-5.1 1020
Version No. 1.0 Page 24 of 24
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