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STEREO RECEIVER SX -20
VOLUME
MEMORY TUNE / PRESET
STANDBY ON
TONE BALANCE
STANDBY
PHONES
ORDER NO.
RRV4392
A SPEAKERS B
SX-20-K
STEREO RECEIVER
SX-20-K
SX-20-S
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
Model Type Power Requirement Remarks
SX-20-K YXE8 AC 220 V to 230 V
SX-20-S YXE8 AC 220 V to 230 V
PIONEER CORPORATION 1-1, Shin-ogura, Saiwai-ku, Kawasaki-shi, Kanagawa 212-0031, Japan
PIONEER ELECTRONICS (USA) INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A.
PIONEER EUROPE NV Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936
PIONEER CORPORATION 2012
K-ZZZ OCT. 2012 Printed in Japan
1 2 3 4
SAFETY INFORMATION
A
This service manual is intended for qualified service technicians; it is not meant for the casual do-it-
yourselfer. Qualified technicians have the necessary test equipment and tools, and have been trained
to properly and safely repair complex products such as those covered by this manual.
Improperly performed repairs can adversely affect the safety and reliability of the product and may
void the warranty. If you are not qualified to perform the repair of this product properly and safely, you
should not risk trying to do so and refer the repair to a qualified service technician.
B
CONTENTS
SAFETY INFORMATION..........................................................................................................................................................2
1. SERVICE PRECAUTIONS ....................................................................................................................................................3
C
1.1 NOTES ON SOLDERING ...............................................................................................................................................3
1.2 SERVICE NOTICE..........................................................................................................................................................3
2. SPECIFICATIONS .................................................................................................................................................................4
3. BASIC ITEMS FOR SERVICE...............................................................................................................................................5
3.1 CHECK POINTS AFTER SERVICING............................................................................................................................5
3.2 PCB LOCATIONS ...........................................................................................................................................................6
4. BLOCK DIAGRAM.................................................................................................................................................................8
4.1 OVERALL WIRING DIAGRAM .......................................................................................................................................8
4.2 SIGNAL BLOCK DIAGRAM ..........................................................................................................................................10
4.3 LEVEL and POWER SUPPLY BLOCK DIAGRAM .......................................................................................................12
4.4 GND MAP DIAGRAM....................................................................................................................................................14
5. DIAGNOSIS.........................................................................................................................................................................16
D 5.1 TROUBLESHOOTING ..................................................................................................................................................16
5.2 DETECTION CIRCUIT..................................................................................................................................................22
5.3 IC INFORMATION.........................................................................................................................................................23
6. SERVICE MODE .................................................................................................................................................................33
6.1 SERVICE MODE...........................................................................................................................................................33
6.2 FACTORY DEFAULT SETTINGS .................................................................................................................................36
7. DISASSEMBLY ...................................................................................................................................................................37
8. EACH SETTING AND ADJUSTMENT ................................................................................................................................43
9. EXPLODED VIEWS AND PARTS LIST...............................................................................................................................44
9.1 PACKING SECTION .....................................................................................................................................................44
9.2 EXTERIOR SECTION...................................................................................................................................................46
10. SCHEMATIC DIAGRAM....................................................................................................................................................50
E 10.1 MAIN ASSY (1/2) ........................................................................................................................................................50
10.2 MAIN ASSY (2/2) ........................................................................................................................................................52
10.3 FRONT, LED, POWER SW. SPK SW AB, RMC and HP ASSYS ...............................................................................54
11. PCB CONNECTION DIAGRAM.........................................................................................................................................56
11.1 MAIN ASSY.................................................................................................................................................................56
11.2 FRONT, POWER SW, HP, LED, RMC, SPK SW AB, GUIDE C and GUIDE R ASSYS..............................................60
12. PCB PARTS LIST ..............................................................................................................................................................64
F
2 SX-20-K
1 2 3 4
5 6 7 8
1. SERVICE PRECAUTIONS
1.1 NOTES ON SOLDERING