Pioneer VSX-521-K Service Manual

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CONTENTS
SAFETY INFORMATION ..........................................................................................................................................................2
1. SERVICE PRECAUTIONS ....................................................................................................................................................5
1.1 NOTES ON SOLDERING ...............................................................................................................................................5
1.2 SERVICE NOTICE ..........................................................................................................................................................5
2. SPECIFICATIONS .................................................................................................................................................................6
3. BASIC ITEMS FOR SERVICE...............................................................................................................................................9
3.1 CHECK POINTS AFTER SERVICING............................................................................................................................9
3.2 JIGS LIST........................................................................................................................................................................9
3.3 PCB LOCATIONS .........................................................................................................................................................10
4. BLOCK DIAGRAM...............................................................................................................................................................14
4.1 OVERALL WIRING DIAGRAM......................................................................................................................................14
4.2 AUDIO BLOCK DIAGRAM (for VSX-821-K, VSX-521-K)..............................................................................................16
4.3 AUDIO BLOCK DIAGRAM (for VSX-921-K)..................................................................................................................18
4.4 D-MAIN BLOCK DIAGRAM (for VSX-821-K, VSX-521-K) ............................................................................................20
4.5 D-MAIN BLOCK DIAGRAM (for VSX-921-K) ................................................................................................................22
4.6 VIDEO BLOCK DIAGRAM ............................................................................................................................................24
4.7 POWER SUPPLY and MAIN UCOM BLOCK DIAGRAM ..............................................................................................26
5. DIAGNOSIS.........................................................................................................................................................................28
5.1 TROUBLESHOOTING ..................................................................................................................................................28
5.2 ADAPTER ERROR MESSAGE.....................................................................................................................................44
5.3 USB / iPod ERROR MESSAGE ....................................................................................................................................45
5.
4 DETECTION CIRCUIT..................................................................................................................................................46
6. SERVICE MODE .................................................................................................................................................................48
6.1 SERVICE MODE...........................................................................................................................................................48
7. DISASSEMBLY....................................................................................................................................................................52
8. EACH SETTING AND ADJUSTMENT ................................................................................................................................62
8.1 ADJUSTMENT REQUIRED WHEN THE UNIT IS REPAIRED OR REPLACED ..........................................................62
8.2 UPDATING OF THE FIRMWARE..................................................................................................................................63
8.3 IDLE CURRENT ADJUSTMENT ..................................................................................................................................67
9. EXPLODED VIEWS AND PARTS LIST...............................................................................................................................70
9.1 PACKING SECTION......................................................................................................................................................70
10. SCHEMATIC DIAGRAM ....................................................................................................................................................80
10.1 AUDIO ASSY ..............................................................................................................................................................80
10.2 AMP ASSY (1/2) (for VSX-921-K) ...............................................................................................................................82
10.3 AMP ASSY (2/2) (for VSX-921-K) ...............................................................................................................................84
10.4 AMP ASSY (1/2) (for VSX-821-K, VSX-521-K) ...........................................................................................................86
10.5 AMP ASSY (2/2) (for VSX-821-K, VSX-521-K) ...........................................................................................................88
10.6 M
AIN ASSY.................................................................................................................................................................90
10.7 SUBWOOFER, HEADPHONE, MIC, GUIDE L, R, WIRE GUIDE A and B ASSYS....................................................92
10.8 VIDEO ASSY ..............................................................................................................................................................94
10.9 F-VIDEO, FRONT and POWER ASSYS .....................................................................................................................96
10.10 CPU, BRIDGE A and B ASSYS ................................................................................................................................98
10.11 STANDBY ASSY .....................................................................................................................................................100
10.12 D-MAIN ASSY (1/4) ................................................................................................................................................102
10.13 D-MAIN ASSY (2/4) ................................................................................................................................................104
10.14 D-MAIN ASSY (3/4) ................................................................................................................................................106
10.15 D-MAIN ASSY (4/4) ................................................................................................................................................108
10.16 USB ASSY (VSX-821-K, VSX-921-K only) .............................................................................................................110
10.17 BT ASSY .................................................................................................................................................................112
11.
PCB CONNECTION DIAGRAM ......................................................................................................................................114
11.1 AUDIO ASSY ............................................................................................................................................................114
11.2 AMP ASSY (for VSX-921-K) .....................................................................................................................................116
11.3 AMP ASSY (for VSX-821-K, VSX-521-K) .................................................................................................................118
11.4 MAIN ASSY...............................................................................................................................................................120
11.5 SUBWOOFER, HEADPHONE and MIC ASSYS ......................................................................................................124
11.6 GUIDE L, R, WIRE GUIDE A and B ASSYS.............................................................................................................126
11.7 VIDEO ASSY ............................................................................................................................................................128
11.8 F-VIDEO, FRONT and POWER ASSYS...................................................................................................................130
11.9 CPU ASSY ................................................................................................................................................................134
11.10 BRIDGE A and B ASSYS........................................................................................................................................138
11.11 STANDBY ASSY .....................................................................................................................................................139
11.12 D-MAIN ASSY.........................................................................................................................................................140
11.13 USB A
SSY (VSX-821-K, VSX-921-K only) .............................................................................................................144
11.14 BT ASSY .................................................................................................................................................................145
12. PCB PARTS LIST ............................................................................................................................................................146

Pioneer VSX-521-K Specifications

General

Impedance	8 Ω
Receiver type	-
Frequency range	20 - 20000 Hz
RMS rated power	550 W
Audio output channels	5.1 channels
Signal-to-Noise Ratio (SNR)	79 dB
Total Harmonic Distortion (THD)	0.05 %
Power output per channel (1KHz@6 Ohm)	125 W
Power output per channel (20-20KHz@8 Ohm)	- W
AirPlay	No
Product color	Black
Audio decoders	Dolby Digital EX, Dolby Digital Plus, Dolby Pro Logic IIz, Dolby TrueHD, DTS-HD
Apple docking compatibility	Not supported
HDMI in	4
Digital audio coaxial in	1
Digital audio optical in	2
Multichannel audio input type	Terminals
Headphone connectivity	3.5 mm
Connectivity technology	Wired
AM band range	530 - 1700 kHz
FM band range	87.5 - 108 MHz
Supported radio bands	AM, FM
Preset stations quantity	30
AC input voltage	120 V
AC input frequency	60 Hz
Power consumption (standby)	0.4 W
Power consumption (typical)	415 W

Weight and Dimensions

Depth	363 mm
Width	435 mm
Height	168 mm
Weight	9000 g

Summary

SAFETY INFORMATION

1. SAFETY PRECAUTIONS

General safety guidelines for service technicians, including leakage current checks.

2. PRODUCT SAFETY NOTICE

Information on safety-related characteristics of components and the importance of using specified parts.

IMPORTANT CHECK POINTS FOR GOOD SERVICING

1. Product safety

Conforming to regulations, using specified parts, and maintaining a safe servicing environment.

2. Adjustments

Procedures for optimum adjustments and confirmation of product characteristics.

3. Lubricants, Glues, and Replacement parts

Guidelines for using specified lubricants and adhesives for repairs.

4. Cleaning

Procedures for cleaning parts to restore performance, such as optical pickups.

5. Shipping mode and Shipping screws

Steps to protect products from damage during transit, including setting shipping modes.

SERVICE PRECAUTIONS

1.1 NOTES ON SOLDERING

Guidance on using lead-free solder and appropriate soldering iron temperatures for repairs.

1.2 SERVICE NOTICE

Notices regarding discharging and ground points connection for servicing safety.

SPECIFICATIONS

Amplifier section

Technical details of the amplifier's power output, impedance, and audio specifications.

Digital In/Out Section

Specifications for HDMI, USB, and other digital input/output terminals.

Audio Section

Input sensitivity, output level, and signal-to-noise ratio for the audio circuits.

Video Section

Signal levels and resolutions for composite and component video inputs.

Tuner Section

Frequency ranges and antenna inputs for AM and FM tuners.

Accessories

List of included accessories such as remote control, microphone, and cables.

BASIC ITEMS FOR SERVICE

3.1 CHECK POINTS AFTER SERVICING

Essential checks to perform after servicing to ensure product quality and functionality.

3.2 JIGS LIST

List of special jigs required for diagnosis and firmware updates.

Lubricants and Glues List

Specific lubricants and glues used in the product and their part numbers.

PCB LOCATIONS

VSX-821-K, VSX-921-K

Visual identification of PCB locations within the VSX-821-K and VSX-921-K models.

BLOCK DIAGRAM

4.1 OVERALL WIRING DIAGRAM

A comprehensive block diagram showing the overall wiring connections between major assemblies.

AUDIO BLOCK DIAGRAM

for VSX-821-K, VSX-521-K

Detailed block diagram of the audio circuits for VSX-821-K and VSX-521-K models.

AUDIO BLOCK DIAGRAM

for VSX-921-K

Detailed block diagram of the audio circuits specifically for the VSX-921-K model.

D-MAIN BLOCK DIAGRAM

for VSX-821-K, VSX-521-K

Block diagram for the D-MAIN assembly, detailing its functions for VSX-821-K/521-K.

D-MAIN BLOCK DIAGRAM

for VSX-921-K

Block diagram for the D-MAIN assembly, detailing its functions for VSX-921-K.

DIAGNOSIS

5.1 TROUBLESHOOTING

Step-by-step troubleshooting procedures for common issues encountered with the unit.

HDMI TROUBLESHOOTING

HDMI Troubleshooting

Diagnosing issues with HDMI authentication and connectivity between source and display.

HDMI Simple Diagnosis

Basic checks for no display or sound from the monitor via HDMI.

iPod TROUBLESHOOTING

Step 0: Preliminary confirmation

Initial checks to perform before troubleshooting iPod connectivity issues.

Step 1: Power supply

Verifying power supply voltages for iPod connectivity troubleshooting.

BT (Bluetooth) TROUBLESHOOTING

Step 0: Preliminary confirmation

Initial checks to perform before troubleshooting Bluetooth connectivity.

Step 1: BT_DET

Checking the Bluetooth detection circuit and voltage levels.

Step 2: Power supply

Verifying power supply voltages for Bluetooth module troubleshooting.

Step 3: BT_ID

Checking the voltage for Bluetooth identification signals.

Step 4: Communication

Verifying communication signals between Bluetooth module and main unit.

Step 5: Audio out check

Testing audio output signals from the Bluetooth module.

DETECTION CIRCUIT

[1] Overload and DC Protection Circuit

Schematic of the overload and DC protection circuits within the unit.

SERVICE MODE

6.1 SERVICE MODE

Accessing and using the service mode to display protection detection counts.

The unit's operation when a error is detected

3.1 DC (AMP is abnormality) error detection

Unit behavior and indications upon detecting a DC error in the amplifier.

3.2 OVERLOAD (overcurrent) error detection

Unit behavior and indications upon detecting an overload or overcurrent error.

DISASSEMBLY

1. Discharging

Procedures for safely discharging capacitors before disassembly.

Disassembly

[1] Front Panel Section

Step-by-step guide to removing the front panel section of the unit.

MAIN Assy

[4-1] Chassis back, D-MAIN Assy

Instructions for removing the chassis back and D-MAIN Assy.

[4-2] MAIN Assy

Steps for removing the main assembly, including related parts like wire guides.

EACH SETTING AND ADJUSTMENT

8.1 ADJUSTMENT REQUIRED WHEN THE UNIT IS REPAIRED OR REPLACED

Guidelines on when to perform adjustments after replacing assemblies or parts.

EXPLODED VIEWS AND PARTS LIST

9.1 PACKING SECTION

Details on how the unit is packed, including a parts list for packing materials.