Pioneer SX-20-K Service Manual

ORDER NO.
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
2012 Printed in Japan
STEREO RECEIVER
VOLUM E
TUNE / PRESET
MEMORY
STANDBY
A
SPEAKERS B
PHONES
TONE
BALANCE
SX
-
20
STANDBY ON
SX-20-K
RRV4392
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
K-ZZZ OCT.

Pioneer SX-20-K Specifications

General

Brand	Pioneer
Model	SX-20-K
Category	Stereo Receiver
Language	English

Summary

SAFETY INFORMATION

1. SERVICE PRECAUTIONS

1.1 NOTES ON SOLDERING

Lead-free soldering guidelines and temperature settings.

1.2 SERVICE NOTICE

Procedure for discharging components before service.

2. SPECIFICATIONS

3. BASIC ITEMS FOR SERVICE

3.1 CHECK POINTS AFTER SERVICING

Post-repair checks for product quality and functionality.

3.2 PCB LOCATIONS

4. BLOCK DIAGRAM

4.1 OVERALL WIRING DIAGRAM

Overall wiring diagram illustrating connections between major assemblies and components.

4.2 SIGNAL BLOCK DIAGRAM

4.3 LEVEL and POWER SUPPLY BLOCK DIAGRAM

LEVEL DIAGRAM

Diagram showing signal levels throughout the audio path from input to output.

POWER DIAGRA

Diagram illustrating power supply distribution and transformer connections.

4.4 GND MAP DIAGRAM

5. DIAGNOSIS

5.1 TROUBLESHOOTING

Flowchart for diagnosing and resolving 'Speaker_A No sound' issues.

Speaker_B No sound

Troubleshooting steps for diagnosing and resolving 'Speaker_B No sound' issues.

Phones No sound

Troubleshooting steps for diagnosing and resolving 'Phones No sound' issues.

RECODER IN No sound

Troubleshooting steps for diagnosing and resolving 'RECODER IN No sound' issues.

PHONO No sound

Troubleshooting steps for diagnosing and resolving 'PHONO No sound' issues.

TUNER No sound

Troubleshooting steps for diagnosing and resolving 'TUNER No sound' issues.

FL No light

Troubleshooting steps for diagnosing and resolving 'FL No light' issues.

Remote control unit does not work.

Troubleshooting steps for diagnosing and resolving 'Remote control unit does not work' issues.

5.2 DETECTION CIRCUIT

5.3 IC INFORMATION

6. SERVICE MODE

6.1 SERVICE MODE

Instructions for accessing and using service modes for protection detection display.

Reset mode for numbers of protection detections

Procedure for clearing protection detection counts to factory defaults.

Unit Operation During Error Detection

DC (AMP Abnormality) Error Detection

Details on how the unit operates and how errors are detected for DC abnormalities.

OVERLOAD (Overcurrent) Error Detection

Details on how the unit operates and how errors are detected for overload conditions.

TEMP (AMP Overheat) Error Detection

Details on how the unit operates and how errors are detected for temperature abnormalities.

POWER PROTECTION Error Detection

Details on how the unit operates and how errors are detected for power protection.

Cancel DC or Power Protection Error Status

Procedure to cancel error status and restore unit operation after DC or power protection errors.

6.2 FACTORY DEFAULT SETTINGS

7. DISASSEMBLY

[1] Discharge

Procedure for safely discharging electrical charge from main capacitors before disassembly.

[1-1] Main Capacitor (C509, C510)

Steps to discharge main capacitors C509 and C510 using a resistor.

[1-2] FL-30V

Procedure to discharge the -30V supply for the FL display using a resistor.

[2] Disassembly

[2-1] Cabinet

Instructions for removing the main cabinet of the unit.

[2-2] Front Section

Instructions for removing the front section of the unit, including FFC disconnection.

[2-3] MAIN ASSY

[3] Diagnosis

[4] Notes on assembling

[4-1] Direction of Insulator

Instructions for correctly aligning insulators during the assembly process.

8. EACH SETTING AND ADJUSTMENT

9. EXPLODED VIEWS AND PARTS LIST

9.1 PACKING SECTION

Exploded view and parts list for the packing materials and accessories.

PACKING SECTION PARTS LIST

CONTRAST TABLE

Comparison table showing differences in parts between SX-20-K/YXE8 and SX-20-S/YXE8 models.

9.2 EXTERIOR SECTION

EXTERIOR SECTION PARTS LIST

CONTRAST TABLE

Comparison table for exterior parts between SX-20-K/YXE8 and SX-20-S/YXE8 models.

10. SCHEMATIC DIAGRAM

10.1 MAIN ASSY (1/2)

First part of the main assembly schematic diagram detailing component connections.

10.2 MAIN ASSY (2/2)

10.3 FRONT, LED, POWER SW. SPK SW AB, RMC and HP ASSYS

11. PCB CONNECTION DIAGRAM

11.1 MAIN ASSY

PCB connection diagram for the main assembly, illustrating connector placements.

11.2 FRONT, POWER SW, HP, LED, RMC, SPK SW AB, GUIDE C and GUIDE R ASSYS

12. PCB PARTS LIST

LIST OF ASSEMBLIES

List of major assemblies and their respective part numbers.

MAIN ASSY SEMICONDUCTORS

List of semiconductor components used in the main assembly.

FRONT ASSY SEMICONDUCTORS

List of semiconductor components used in the front assembly.

POWER SW ASSY MISCELLANEOUS

HP ASSY MISCELLANEOUS

LED ASSY SEMICONDUCTORS

RMC ASSY MISCELLANEOUS

SPK SW AB ASSY SEMICONDUCTORS