PIONEER VSX-821-K, VSX-921-K, VSX-521-K User manual

2011

VSX-821-K

For details, refer to "Important Check Points for good servicing".

AUDIO/VIDEO MULTI-CHANNEL RECEIVER

VSX-821-K

VSX-921-K
VSX-521-K

THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).

Model Type Power Requirement Remarks

VSX-821-K CUXCNSM AC 120 V

VSX-921-K UXCNCB AC 120 V

VSX-521-K CUXCNSM AC 120 V

ORDER NO.

RRV4167

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

K-IZV MAR.

2011 Printed in Japan

1

WARNING

This product may contain a chemical known to the State of California to cause cancer, or birth defects or other reproductive
harm.

Health & Safety Code Section 25249.6 - Proposition 65

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.

1. SAFETY PRECAUTIONS

The following check should be performed for the
continued protection of the customer and service
technician.

LEAKAGE CURRENT CHECK

Measure leakage current to a known earth ground
(water pipe, conduit, etc.) by connecting a leakage
current tester such as Simpson Model 229-2 or
equivalent between the earth ground and all exposed
metal parts of the appliance (input/output terminals,
screwheads, metal overlays, control shaft, etc.). Plug
the AC line cord of the appliance directly into a 120 V
AC 60 Hz outlet and turn the AC power switch on. Any
current measured must not exceed 0.5 mA.

ANY MEASUREMENTS NOT WITHIN THE LIMITS
OUTLINED ABOVE ARE INDICATIVE OF A POTENTIAL
SHOCK HAZARD AND MUST BE CORRECTED BEFORE
RETURNING THE APPLIANCE TO THE CUSTOMER.

2. PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in the appliance

have special safety related characteristics. These are
often not evident from visual inspection nor the protection
afforded by them necessarily can be obtained by using
replacement components rated for voltage, wattage, etc.
Replacement parts which have these special safety
characteristics are identified in this Service Manual.
Electrical components having such features are
identified by marking with a > on the schematics and on
the parts list in this Service Manual.
The use of a substitute replacement component which
does not have the same safety characteristics as the
PIONEER recommended replacement one, shown in the
parts list in this Service Manual, may create shock, fire,
or other hazards.
Product Safety is continuously under review and new
instructions are issued from time to time. For the latest
information, always consult the current PIONEER Service
Manual. A subscription to, or additional copies of,
PIONEER Service Manual may be obtained at a nominal
charge from PIONEER.

Leakage
current
tester

Reading should
not be above

0.5 mA

Device
under
test

Test all
exposed metal
surfaces

Also test with
plug reversed
(Using AC adapter
plug as required)

Earth
ground

AC Leakage Test

(FOR USA MODEL ONLY)

2 3 4

SAFETY INFORMATION

A

B

C

D

E

F

2

1

2 3 4

VSX-821-K

5

[Important Check Points for Good Servicing]

In this manual, procedures that must be performed during repairs are marked with the below symbol.
Please be sure to confirm and follow these procedures.

1. Product safety

Please conform to product regulations (such as safety and radiation regulations), and maintain a safe servicing environment by
following the safety instructions described in this manual.

1 Use specified parts for repair.

Use genuine parts. Be sure to use important parts for safety.

2 Do not perform modifications without proper instructions.

Please follow the specified safety methods when modification(addition/change of parts) is required due to interferences such as
radio/TV interference and foreign noise.

3 Make sure the soldering of repaired locations is properly performed.

When you solder while repairing, please be sure that there are no cold solder and other debris.
Soldering should be finished with the proper quantity. (Refer to the example)

4 Make sure the screws are tightly fastened.

Please be sure that all screws are fastened, and that there are no loose screws.

5 Make sure each connectors are correctly inserted.

Please be sure that all connectors are inserted, and that there are no imperfect insertion.

6 Make sure the wiring cables are set to their original state.

Please replace the wiring and cables to the original state after repairs.
In addition, be sure that there are no pinched wires, etc.

7 Make sure screws and soldering scraps do not remain inside the product.

Please check that neither solder debris nor screws remain inside the product.

8 There should be no semi-broken wires, scratches, melting, etc. on the coating of the power cord.

Damaged power cords may lead to fire accidents, so please be sure that there are no damages.
If you find a damaged power cord, please exchange it with a suitable one.

9 There should be no spark traces or similar marks on the power plug.

When spark traces or similar marks are found on the power supply plug, please check the connection and advise on secure
connections and suitable usage. Please exchange the power cord if necessary.

a Safe environment should be secured during servicing.

When you perform repairs, please pay attention to static electricity, furniture, household articles, etc. in order to prevent injuries.
Please pay attention to your surroundings and repair safely.

2. Adjustments

To keep the original performance of the products, optimum adjustments and confirmation of characteristics within specification.
Adjustments should be performed in accordance with the procedures/instructions described in this manual.

4. Cleaning

For parts that require cleaning, such as optical pickups, tape deck heads, lenses and mirrors used in projection monitors, proper
cleaning should be performed to restore their performances.

3. Lubricants, Glues, and Replacement parts

Use grease and adhesives that are equal to the specified substance.
Make sure the proper amount is applied.

5. Shipping mode and Shipping screws

To protect products from damages or failures during transit, the shipping mode should be set or the shipping screws should be
installed before shipment. Please be sure to follow this method especially if it is specified in this manual.

6 7 8

A

B

C

D

5

VSX-821-K

6 7 8

E

F

3

1

2 3 4

CONTENTS

SAFETY INFORMATION ..........................................................................................................................................................2

1. SERVICE PRECAUTIONS ....................................................................................................................................................5

A

B

C

D

E

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

F

4

1

2 3 4

VSX-821-K

5

• For environmental protection, lead-free solder is used on the printed circuit boards mounted in this unit.
Be sure to use lead-free solder and a soldering iron that can meet specifications for use with lead-free solders for repairs
accompanied by reworking of soldering.

• Compared with conventional eutectic solders, lead-free solders have higher melting points, by approximately 40 ºC.
Therefore, for lead-free soldering, the tip temperature of a soldering iron must be set to around 373 ºC in general, although
the temperature depends on the heat capacity of the PC board on which reworking is required and the weight of the tip of
the soldering iron.

Do NOT use a soldering iron whose tip temperature cannot be controlled.

Compared with eutectic solders, lead-free solders have higher bond strengths but slower wetting times and higher melting
temperatures (hard to melt/easy to harden).

The following lead-free solders are available as service parts:

• Parts numbers of lead-free solder:
GYP1006 1.0 in dia.
GYP1007 0.6 in dia.
GYP1008 0.3 in dia.

• Discharging

For more detail, please refer to "7. DISASSEMBLY - 1. Discharging".

• Notes on Ground Points Connection

For more detail, please refer to "7. DISASSEMBLY - 2. Notes on Ground Points Connection".

6 7 8

1. SERVICE PRECAUTIONS

1.1 NOTES ON SOLDERING

A

B

1.2 SERVICE NOTICE

C

D

E

F

VSX-821-K

5

6 7 8

5

1

Amplifier section

Continuous average power output of 80 watts* per
channel, min., at 8 ohms, from 20 Hz to 20 000 Hz with
no more than 0.08 %** total harmonic distortion.

Front (stereo)............................................................80 W + 80 W

Power output (1 kHz, 8 Ω, 0.05 %).......................110 W per channel

Guaranteed speaker impedance

FRONT:A, B................................................................6 Ω to 16 Ω

FRONT:A+B..............................................................12 Ω to 16 Ω

SURROUND, CENTER...................................................6 Ω to 16 Ω

* Measured pursuant to the Federal Trade Commission’s Trade
Regulation rule on Power Output Claims for Amplifiers
** Measured by Audio Spectrum Analyzer

Audio Section

Input (Sensitivity/Impedance)

LINE.......................................................................200 mV/47 kΩ

Output (Level/Impedance)

REC.......................................................................200 mV/2.2 kΩ

Signal-to-Noise Ratio (IHF, short circuited, A network)

LINE.....................................................................................98 dB

Signal-to-Noise Ratio [EIA, at 1 W (1 kHz)]

LINE.....................................................................................79 dB

Video Section

Signal level

Composite...............................................................1 Vp-p (75 Ω)

Component Video.............................................Y: 1.0 Vp-p (75 Ω)

PB, PR: 0.7 Vp-p (75 Ω)
Corresponding maximum resolution

Component Video..................................................1080p (1125p)

Tuner Section

Frequency Range (FM)...................................87.5 MHz to 108 MHz

Antenna Input (FM).................................................75 Ω unbalanced

Frequency Range (AM).....................................530 kHz to 1700 kHz

Antenna (AM)...............................................................Loop antenna

Digital In/Out Section

HDMI terminal............................................................Type A (19-pin)

HDMI output type............................................................5 V, 100 mA

USB terminal.........................................USB2.0 Full Speed (Type A)

iPod terminal........................................USB, and Video (Composite)

SIRIUS antenna cable.......................................8-pin mini DIN cable

ADAPTER PORT terminal..............................................5 V, 100 mA

Miscellaneous

Power Requirements................................................AC 120 V, 60 Hz

Power Consumption.................................................................415 W

In standby...........................................................0.4 W (Control OFF)

Dimensions....................435 mm (W) x 168 mm (H) x 362.5 mm (D)

17

3

/16 in. (W) x 65/8 in. (H) x 145/16 in. (D)

Weight (without package)......................................9.2 kg (20 lb 5 oz)

Furnished Parts

Microphone (for Auto MCACC setup)...............................................1

Remote control.................................................................................1

Dry cell batteries (AAA size IEC R03)..............................................2

AM loop antenna..............................................................................1

FM wire antenna..............................................................................1

iPod cable.........................................................................................1

Operating instructions......................................................................1

Note

Specifications and the design are subject to possible modifications
without notice, due to improvements.

VSX-821-K

iPod cable
(L308102013020-IL)

Accessories

Remote control
(8300762100010-IL)

AM loop antenna
(E601019000010-IL)

FM wire antenna
(E605010140010-IL)

Dry cell batteries
(AAA size IEC R03) x2

Microphone (for Auto MCACC setup)
(APM7008)

2. SPECIFICATIONS

A

2 3 4

B

C

D

E

F

6

1

2 3 4

VSX-821-K

Amplifier section

Continuous average power output of 80 watts* per
channel, min., at 8 ohms, from 20 Hz to 20 000 Hz with
no more than 0.08 %** total harmonic distortion.

Front (stereo)............................................................80 W + 80 W

Power output (1 kHz, 8 Ω, 0.05 %).......................110 W per channel

Guaranteed speaker impedance.....................................6 Ω to 16 Ω

* Measured pursuant to the Federal Trade Commission’s Trade
Regulation rule on Power Output Claims for Amplifiers
** Measured by Audio Spectrum Analyzer

Audio Section

Input (Sensitivity/Impedance)

LINE.......................................................................200 mV/47 kΩ

Output (Level/Impedance)

REC.......................................................................200 mV/2.2 kΩ

Signal-to-Noise Ratio (IHF, short circuited, A network)

LINE.....................................................................................98 dB

Signal-to-Noise Ratio [EIA, at 1 W (1 kHz)]

LINE.....................................................................................79 dB

Video Section

Signal level

Composite...............................................................1 Vp-p (75 Ω)

Component Video.............................................Y: 1.0 Vp-p (75 Ω)

PB, PR: 0.7 Vp-p (75 Ω)
Corresponding maximum resolution

Component Video..................................................1080p (1125p)

Tuner Section

Frequency Range (FM)...................................87.5 MHz to 108 MHz

Antenna Input (FM).................................................75 Ω unbalanced

Frequency Range (AM).....................................530 kHz to 1700 kHz

Antenna (AM)...............................................................Loop antenna

Digital In/Out Section

HDMI terminal............................................................Type A (19-pin)

HDMI output type............................................................5 V, 100 mA

USB terminal.........................................USB2.0 Full Speed (Type A)

iPod terminal........................................USB, and Video (Composite)

SIRIUS antenna cable.......................................8-pin mini DIN cable

ADAPTER PORT terminal..............................................5 V, 100 mA

Miscellaneous

Power Requirements................................................AC 120 V, 60 Hz

Power Consumption.................................................................500 W

In standby...........................................................0.4 W (Control OFF)

Dimensions....................435 mm (W) x 168 mm (H) x 362.5 mm (D)

17

3

/16 in. (W) x 65/8 in. (H) x 145/16 in. (D)

Weight (without package)......................................9.6 kg (21 lb 3 oz)

Furnished Parts

Microphone (for Auto MCACC setup)...............................................1

Remote control.................................................................................1

Dry cell batteries (AAA size IEC R03)..............................................2

AM loop antenna..............................................................................1

FM wire antenna..............................................................................1

iPod cable.........................................................................................1

Operating instructions......................................................................1

Note

Specifications and the design are subject to possible modifications
without notice, due to improvements.

VSX-921-K

iPod cable
(L308102013020-IL)

Accessories

Remote control
(8300762100010-IL)

AM loop antenna
(E601019000010-IL)

FM wire antenna
(E605010140010-IL)

Dry cell batteries
(AAA size IEC R03) x2

Microphone (for Auto MCACC setup)
(APM7008)

5

6 7 8

A

B

C

D

5

6 7 8

VSX-821-K

E

F

7

A

Amplifier section

Continuous average power output of 80 watts* per
channel, min., at 8 ohms, from 20 Hz to 20 000 Hz with
no more than 0.08 %** total harmonic distortion.

Front (stereo)............................................................80 W + 80 W

Power output (1 kHz, 8 Ω, 0.05 %).......................110 W per channel

Guaranteed speaker impedance.....................................6 Ω to 16 Ω

* Measured pursuant to the Federal Trade Commission’s Trade
Regulation rule on Power Output Claims for Amplifiers
** Measured by Audio Spectrum Analyzer

Audio Section

Input (Sensitivity/Impedance)

LINE.......................................................................200 mV/47 kΩ

Output (Level/Impedance)

REC.......................................................................200 mV/2.2 kΩ

Signal-to-Noise Ratio (IHF, short circuited, A network)

LINE.....................................................................................98 dB

Signal-to-Noise Ratio [EIA, at 1 W (1 kHz)]

LINE.....................................................................................79 dB

Video Section

Signal level

Composite...............................................................1 Vp-p (75 Ω)

Component Video.............................................Y: 1.0 Vp-p (75 Ω)

PB, PR: 0.7 Vp-p (75 Ω)
Corresponding maximum resolution

Component Video..................................................1080p (1125p)

Tuner Section

Frequency Range (FM)...................................87.5 MHz to 108 MHz

Antenna Input (FM).................................................75 Ω unbalanced

Frequency Range (AM).....................................530 kHz to 1700 kHz

Antenna (AM)...............................................................Loop antenna

Digital In/Out Section

HDMI terminal............................................................Type A (19-pin)

HDMI output type............................................................5 V, 100 mA

ADAPTER PORT terminal..............................................5 V, 100 mA

Miscellaneous

Power Requirements................................................AC 120 V, 60 Hz

Power Consumption.................................................................415 W

In standby...........................................................0.4 W (Control OFF)

Dimensions....................435 mm (W) x 168 mm (H) x 362.5 mm (D)

17

3

/16 in. (W) x 65/8 in. (H) x 145/16 in. (D)

Weight (without package)....................................9.0 kg (19 lb 14 oz)

Furnished Parts

Microphone (for Auto MCACC setup)...............................................1

Remote control.................................................................................1

Dry cell batteries (AAA size IEC R03)..............................................2

AM loop antenna..............................................................................1

FM wire antenna..............................................................................1

Operating instructions......................................................................1

Note

Specifications and the design are subject to possible modifications
without notice, due to improvements.

VSX-521-K

Accessories

Remote control
(8300761900010-IL)

AM loop antenna
(E601019000010-IL)

FM wire antenna
(E605010140010-IL)

Dry cell batteries
(AAA size IEC R03) x2

Microphone (for Auto MCACC setup)
(APM7008)

1

2 3 4

B

C

D

E

F

8

1

2 3 4

VSX-821-K

5

Items to be checked after servicing

To keep the product quality after servicing, confirm recommended check points shown below.

See the table below for the items to be checked regarding video and audio.

No.

Item to be checked regarding video Item to be checked regarding audio

Procedures Check points

1 Confirm whether the customer complain has been solved.

If the customer complain occurs with the particular source, such
as Dolby Digital, DTS, AAC, DVD-A and HDMI, input it for the
operation check.

The customer complain must not be reappeared.
Video, Audio and operations must be normal.

2 Check the analog audio playback.

(Make the analog connections with a DVD player.)

Each channel audio and operations must be normal.

3 Check the digital audio playback.

(Make the digital connections with a DVD player.)

Each channel audio and operations must be normal.

4 Check surround playback.

(Select Surround mode and check the multichannel operations
via the DSP circuit.)

Each channel audio and operations must be normal.

5 Check the video outputs.

(Connect with a DVD player.)

Video and operations must be normal.

6 Check the tuner (AM and FM) operations. Audio and operations must be normal.

7 Check the sound from headphone output. Sound must be normal, without noise.

8 Check the appearance of the product.

Block noise Distortion

Horizontal noise Noise

Flicker Volume too low

Disturbed image (video jumpiness) Volume too high

Too dark Volume fluctuating

Too bright Sound interrupted

Mottled color

No scratches or dirt on its appearance after receiving it for
service.

Jigs List

Jig Name Part No. Remarks

RS-232C update jig (Jig + 10P FFC) GGF1642

Firmware update (RS-232C ↔ Rear panel)

RS-232C cable (9-pin to 9-pin, straight cable)

9P extension jig cable (for 5 ch) GGD1739

Diagnosis (AMP Assy ↔ AUDIO Assy)

31P extension jig FFC GGD1738 Diagnosis (DISPLAY Assy ↔ CPU Assy)

Diagnosis (D-MAIN Assy ↔ CPU Assy)

Diagnosis (D-MAIN Assy ↔ BRIDGE A Assy)

13P extension jig cable (for 7 ch) GGD1740

Board to board extension jig cable GGD1733

Board to board extension jig cable GGD1734

Lubricants and Glues List

Name Part No. Remarks

Silicon grease GEM1057 Refer to "9.2 EXTERIOR SECTION (VSX-821-K, VSX-921-K)"

and "9.3 EXTERIOR SECTION (VSX-521-K)".

Silicon adhesive GYA1011

(KE40RTV-W)

Refer to "9.2 EXTERIOR SECTION (VSX-821-K, VSX-921-K)"
and "9.3 EXTERIOR SECTION (VSX-521-K)".

6 7 8

3. BASIC ITEMS FOR SERVICE

3.1 CHECK POINTS AFTER SERVICING

A

B

3.2 JIGS LIST

5

6 7 8

VSX-821-K

C

D

E

F

9

1

H

GUIDE L ASSY

P

CPU ASSY

• This photo. is VSX-821-K.

VSX-821-K, VSX-921-K

T

D-MAIN ASSY

R

BRIDGE B ASSY

BRIDGE A ASSY

J

WIRE GUIDE A
ASSY

N

FRONT ASSY

E

SUBWOOFER ASSY

L

VIDEO ASSY

F

HEADPHONE ASSY

U

USB ASSY

V

BT ASSY

A

AUDIO ASSY

G

MIC ASSY

M

F-VIDEO ASSY

O

POWER ASSY

I

GUIDE R ASSY

S

STANDBY ASSY

K

WIRE GUIDE B

ASSY

C

AMP ASSY

B

D

MAIN ASSY

Q

3.3 PCB LOCATIONS

A

2 3 4

B

C

D

E

F

10

VSX-821-K

1

2 3 4

5

NSP 1..MAIN ASSY (VSX-821-K) 7025HK1011010-IL
NSP 1..MAIN ASSY (VSX-921-K) 7025HK1014010-IL

2..MAIN ASSY (VSX-821-K) 70280702710H0-IL

2..MAIN ASSY (VSX-921-K) 70280702710G0-IL

2..SUBWOOFER ASSY 7028070272070-IL

2..GUIDE L ASSY 7028070273070-IL

2..GUIDE R ASSY 7028070274070-IL

2..WIRE GUIDE A ASSY 7028070276070-IL

2..WIRE GUIDE B ASSY 7028070277070-IL

NSP 1..AMP1 ASSY (VSX-821-K ONLY) 7025HK1011017-IL

2..AMP ASSY (VSX-821-K ONLY) 7028070241030-IL

NSP 1..AMP2 ASSY (VSX-921-K ONLY) 7025HK1014016-IL

2..AMP ASSY (VSX-921-K ONLY) 7028070251040-IL

NSP 1..BT ASSY 7025HK1009019-IL

2..BT ASSY 7028070231010-IL

NSP 1..VIDEO ASSY (VSX-821-K) 7025HK1011016-IL
NSP 1..VIDEO ASSY (VSX-921-K) 7025HK1014017-IL

2..VIDEO ASSY (VSX-821-K) 7028070261060-IL

2..VIDEO ASSY (VSX-921-K) 7028070261070-IL

NSP 1..CPU ASSY (VSX-821-K) 7025HK1011011-IL
NSP 1..CPU ASSY (VSX-921-K) 7025HK1014014-IL

2..CPU ASSY (VSX-821-K) 7028070221030-IL

2..CPU ASSY (VSX-921-K) 7028070221070-IL

2..BRIDGE A ASSY 7028070222070-IL

2..BRIDGE B ASSY 7028070223070-IL

2..STANDBY ASSY (VSX-821-K) 7028070225030-IL

2..STANDBY ASSY (VSX-921-K) 7028070225070-IL

NSP 1..FRONT ASSY (VSX-821-K) 7025HK1011013-IL
NSP 1..FRONT ASSY (VSX-921-K) 7025HK1014013-IL

2..FRONT ASSY 7028070211050-IL

2..POWER ASSY 7028070212050-IL

2..MIC ASSY 7028070213050-IL

2..F-VIDEO ASSY 7028070214050-IL

2..HEADPHONE ASSY 7028070215050-IL

NSP 1..AUDIO ASSY (VSX-821-K) 7025HK1011014-IL
NSP 1..AUDIO ASSY (VSX-921-K) 7025HK1014011-IL

2..AUDIO ASSY (VSX-821-K) 7028070181030-IL

2..AUDIO ASSY (VSX-921-K) 7028070181050-IL

NSP 1..USB ASSY 7025HK1014012-IL

2..USB ASSY 7028070201050-IL

NSP 1..D-MAIN ASSY (VSX-821-K) 7025HK1011012-IL
NSP 1..D-MAIN ASSY (VSX-921-K) 7025HK1014018-IL

2..D-MAIN ASSY (VSX-821-K) 7028070191030-IL

2..D-MAIN ASSY (VSX-921-K) 7028070191050-IL

Mark No. Description Part No. Mark No. Description Part No.

LIST OF ASSEMBLIES

NOTES: - Parts marked by “NSP” are generally unavailable because they are not in our Master Spare Parts List.

-

The > mark found on some component parts indicates the importance of the safety factor of the part.

Therefore, when replacing, be sure to use parts of identical designation.

6 7 8

A

B

C

D

E

F

VSX-821-K

5

6 7 8

11

A

NSP 1..MAIN ASSY 7025HK1012010-IL

2..MAIN ASSY 70280702710D0-IL

2..SUBWOOFER ASSY 7028070272050-IL

2..GUIDE L ASSY 7028070273070-IL

2..GUIDE R ASSY 7028070274070-IL

2..WIRE GUIDE A ASSY 7028070276070-IL

2..WIRE GUIDE B ASSY 7028070277070-IL

NSP 1..AMP1 ASSY 7025HK1011017-IL

2..AMP ASSY 7028070241030-IL

NSP 1..BT ASSY 7025HK1009019-IL

2..BT ASSY 7028070231010-IL

NSP 1..VIDEO ASSY 7025HK1011016-IL

2..VIDEO ASSY 7028070261060-IL

NSP 1..CPU ASSY 7025HK1012011-IL

2..CPU ASSY 7028070221020-IL

2..BRIDGE A ASSY 7028070222070-IL

2..BRIDGE B ASSY 7028070223070-IL

2..STANDBY ASSY 7028070225030-IL

NSP 1..FRONT ASSY 7025HK1012013-IL

2..FRONT ASSY 7028070211020-IL

2..POWER ASSY 7028070212050-IL

2..MIC ASSY 7028070213020-IL

2..HEADPHONE ASSY 7028070215050-IL

NSP 1..AUDIO ASSY 7025HK1011014-IL

2..AUDIO ASSY 7028070181030-IL

NSP 1..D-MAIN ASSY 7025HK1012012-IL

2..D-MAIN ASSY 7028070191020-IL

Mark No. Description Part No. Mark No. Description Part No.

LIST OF ASSEMBLIES

NOTES: - Parts marked by “NSP” are generally unavailable because they are not in our Master Spare Parts List.

-

The > mark found on some component parts indicates the importance of the safety factor of the part.

Therefore, when replacing, be sure to use parts of identical designation.

H

GUIDE L ASSY

N

FRONT ASSY

G

MIC ASSY

P

CPU ASSY

VSX-521-K

T

D-MAIN ASSY

R

BRIDGE B ASSY

BRIDGE A ASSY

J

WIRE GUIDE A ASSY

V

BT ASSY

E

SUBWOOFER ASSY

O

POWER ASSY

F

HEADPHONE ASSY

I

GUIDE R ASSY

S

STANDBY ASSY

K

WIRE GUIDE B

ASSY

A

AUDIO ASSY

L

VIDEO ASSY

C

AMP ASSY

D

MAIN ASSY

Q

1

2 3 4

B

C

D

E

F

12

1

2 3 4

VSX-821-K

5

6 7 8

A

B

C

D

E

F

VSX-821-K

5

6 7 8

13

1

Q

BRIDGE A ASSY
(7028070222070-IL)

V

BT ASSY
(7028070231010-IL)

T

T

( 1/4- 4/4)

T

(VSX-821-K:7028070191030-IL)
(VSX-921-K:7028070191050-IL)

A

AUDIO ASSY
(VSX-821-K/521:702807018030
(VSX-921-K:702807018050-IL)

E

SUBWOOFR ASSY
(VSX-821-K/921:7028070272070-IL)

(VSX-521-K:7028070272050-IL)

(VSX-521-K:7028070191020-IL)

B

AMP ASSY (7ch) ( 1/2, 2/2)

B

B

(VSX-921-K:7028070251040-IL)

POWER ASSY

O

(7028070212050-IL)

F-VIDEO ASSY

M

(VSX-821-K/921:7028070214050-IL

FRONT ASSY

N

(VSX-821-K/921:7028070211050-IL)
(VSX-521-K:7028070211020-IL)

HEADPHONE ASSY

F

(

7028070215050-IL

)

MIC ASSY

G

(VSX-821-K/921:7028070213050-IL)
(VSX-521-K:7028070213020-IL)

D

MAIN ASSY

(VSX-821-K: 70280702710H0-IL)
(VSX-921-K: 70280702710G0-IL)
(VSX-521-K: 70280702710D0-IL)

S

STANDBY ASSY

(VSX-821-K/521:7028070225030-IL)

(VSX-921-K:7028070225070-IL)

C

C

C

AMP ASSY (5ch) ( 1/2, 2/2)
(VSX-821-K/521:7028070241030-IL)

D-MAIN ASSY

Therefore, when replacing, be sure to use parts of identical designation.

When ordering service parts, be sure to refer to "EXPLODED VIEWS and PARTS LIST" or "PCB PARTS LIST".
The > mark found on some component parts indicates the importance of the safety factor of the part.

1.FLAC

2.FLCT

3.FLAC

4

3

5
6

1

4

3

5

1

2.AGND

1.HP_L

3.HP_R

CN2

123

12

34

2

910..

2.NC

4.NC

5.SR

4.SL

3.C

1.FL

.
.

2

.
2
1

11

.
.

2

16

14.AGND

11.BT_L

9.BT_R

10.AGND

6.AGND

4.AGND

2.AGND

.
.

2

14

9..2

3.-6.8V

.

17

16

1

.
.

15

14

1

4

51

2

4

2

..

12 8

CP304

2

6

2

1

..

89

123

1910..

1.AC

5.AC

12

12

2.FR

1

34

5

4

5

CP2

.

10

1

17

12.AGND

8.AGND

1

15

.

2

2

CP702

9.HDMI+12V

7.PDN

8.STBY_RLY

5.CPU_+3.3V

3.FLAC

4.GNDU

1.FLAC

1
2
3

3.GNDU

4.INPUT_DN

5.ST_H+5V

6.POWER_LED

1.STBY_KEY

3.FL2

1.FL1

CP701

CN721

1

CP403

CP405

CN3

2.NC

3.SBR

10.PREGND

9.HIGHGND

5.-HIGHB

6.-HIGHB

7.HIGHGND

4.-HIGHB

1.+HIGHB

2.+HIGHB

CP1

3.GND

(S1)

1

1.FL

2.FR

3.C

CP402

CN1

17.TUNER_+5V

14.TUNER_SEN

12.TUNER_SCLK

13.TUNER_SDIO

8.BT_DET

9.BT_TX

10.BT_RX

3.SIRIUS_P/E

5.BT_ON/CE

6.BT_+5V

4.U/DGND

1.SIRIUS_RX

(SW)

9.BT_TX

10.BT_RX

11.BT_/OC

7.BT_ID

6.BT_+5V

15.SIRIUS_R

13.SIRIUS_L

2.AGND

3.BT_L

CP603

(BT)

(SW)

5.TUNER_R

10

1.SW_MUTE

CP601

9.MIC_DET

10.MIC_SEL

7.GNDA

5.GNDA

6.PORTABLE_L

10

1.+6.8V

2.GNDA

16.GPIO2/INT

17.+5V(TUNER)

14./SEN

13.SDIO

12.SCLK

9.BT_RX

8.BT_DET

10.BT_TX

5.BT_ON/OFF

3.SIRIUS_P/E

4.U/DGND

6.+5V(BT)

1.SIRIUS_RX

(MAIN)

14.AGND

15.SIRIUS_R

13.SIRIUS_L

(MAIN)

10.AGND

11.BT_L

8.AGND

9.BT_R

6.AGND

5.TUNER_R

4.AGND

2.AGND

1.SW_MUTE

CN601

3

18.GNDA

15.SW_OU

13.C_OUT

14.GNDA

8.GNDA

9.SR_OU

10.GNDA

6.GNDA

4.GNDA

5.FR_OU

2.GNDA

1.AIN_R

6.CPU_ST_VCC

2.FLCT

9

2.INPUT_UP

2

(S5)

4.H/P DETECT

2

1.SBL

8.HIGHGND

(MAIN)

3.+HIGHB

(MAIN)

4.SL

5.SR

3

(MAIN)

16.TUNER_INT

15.TUNER_RST

11.BT_OC

7.BT_ID

2.SIRIUS_TX

CP602

8.BT_DET

7.TUNER_L

11

3.SW_OUT

1.BT_R

4.CPU_GND

5.BT_ON/CE

8.MICOUT

4.PORTABLE_R

15./RST

7.BT_ID

11.BT_OC

2.SIRIUS_TX

CP6

12.AGND

CP5

7.TUNER_L

3.SW_OUT

CN209
(BRIDGE_A)

16.GNDA

11.SL_OU

12.GNDA

7.FL_OU

3.AIN_L

CN702

CP701

3.GNDU

6.POWER_LED

5.ST_H+5V

4.INPUT_DN

1.STBY_KEY

9.HDMI+12V

7.PDN

5.CPU+3.3V

6.CPU_ST_VCC

2.FLCT

10.PREGND

8.HIGHGND

5.-HIGHB

6.-HIGHB

7.HIGHGND

3.+HIGHB

1.+HIGHB

2.+HIGHB

(S1)

11.BT_/OC

9.BT_TX

10.BT_RX

6.BT_+5V

7.BT_ID

5.BT_ON/CE

3.BT_L

2.AGND

1.BT_R

CN901

3

17.SBR_O

19.SBL_O

8.STBY_RLY

2.INPUT_UP

4.GNDU

9.HIGHGND

4.-HIGHB

(S2)

(S3,4)

(MAIN)

8.BT_DET

4.CPU_GND

1

5

(921

AC CORD
or INLET

MAIN TRANS

2 3 4

4. BLOCK DIAGRAM

4.1 OVERALL WIRING DIAGRAM

A

B

C

D

E

F

14

1

2 3 4

VSX-821-K

L

VIDEO ASSY
(VSX-821-K/521:7028070261060-IL)
(VSX-921-K:7028070261070-IL)

1/4- 4/4)

T

R

BRIDGE B ASSY
(7028070223070-IL)

P

CPU ASSY

(VSX-821-K: 7028070221030-IL)

(VSX-921-K: 7028070221070-IL)

(VSX-521-K: 7028070221020-IL)

H

GUIDE L ASSY
(7028070273070-IL)

I

GUIDE R ASSY
(7028070274070-IL)

J

WIRE GUIDE A ASSY
(7028070276070-IL)

U

USB ASSY

(VSX-821-K/921:7028070201050-IL)

K

WIRE GUIDE B ASSY
(7028070277070-IL)

4

51

2

4.GNDA

2.GNDV

3.-6.8V

4

1

1

2

1

10

.

2

1

.

.

23.+12V

24.HP_R

26.HP_L

19.GNDA

20.GNDA

21.-12V

17.GNDA

15.GNDA

9.GNDA

5.GNDA

13.SBR

11.SBL

9.FR

5.C

1.FL

3.SL

.

11.MIC

2

.

.

.
.

19

.
2
1

27

6.-6.8V

8.GNDA

1.HP_L

3.HP_R

4.+6.8V

5.+12V

10.F-VR

18.BT_L

CP2

.

12 10..13

8.AGND

9.FR

2.AGND

3.SL

4.AGND

5.C

3.DGND

2.12V

3.DGND

4.DGND

2

2
3

1

123

1234

.
.

2

1

12

3.+12V

.

.

CP8

10

16

2

.

1

.

10

CP9

4

10.+5V

4.GNDV

2.GNDA

.
.

27

.

2

1

3

29

28

.

1
2

11

10

1
2

2

1

.

28

1

10

1

.

.

27

.

1

.

.

5

1

2

.

11

11

.

534

8.BT_R

7.GNDA

22.GNDA

3.GNDA

1

7.SR

1

CP803

CP17

.

26

5.GNDA

12.F-VL

7.-12V

CP3

(S2)

3

1

6.AGND

7.SR

1.FL

2.NC

1.SPDIF

1.12V

3

CN801

1

4

CN5

CN1

CN2

4.+12V

17

9

11

9.Y_IN

11.-5V

2.GNDD

.

CN704A

31

.

2

29

CN203

11

2

.

.

1

2

123

5

CN212 CN205

(921/821 ONLY)

1.GND-USB

2.GND-USB

3.USB_SPDIF

CN802

CP1302

CN207

CN208

CN601

3

18.GNDA

15.SW_OUT

13.C_OUT

14.GNDA

8.GNDA

9.SR_OUT

10.GNDA

6.GNDA

4.GNDA

5.FR_OUT

2.GNDA

1.AIN_R

16.GNDA

11.SL_OUT

10.GNDA

12.GNDA

7.FL_OUT

6.GNDA

8.GNDA

2.GNDA

3.AIN_L

4.GNDA

19

2.HPGND

CP400

1.HP_L

CP721

CP901

(BRIDGE_B)

(D-MAIN)
CP1305

2.USB_RDY

3.USB_TX/RXD

4.USB_RX/TXD

CN703

10.GNDA

8.GNDA

6.GNDA

4.GNDA

CN211

2.GNDA

10

18

(AUDIO)

16.SB_MUTE

17.SW_SUM

18.VOL_CLK

12.Z2_MUTE

13.MIC_MUTE

14.REC_MUTE

6.-6.8V

7.PORTABLE_R

8.GNDA

1.HP_L

2.HPGND

3.HP_R

25.HPGND

14.SIRIUS_R

16.VIDEO_L

CP401

(AUDIO)

10.BT_L

11.GNDA

12.SIRIUS_L

2

4.TUNER_R

6.TUNER_L

26

1.SW_MUTE

2.SW_OUT

5.U_PWR_ON

2.USB-RDY

1.RESET#

3.UART-TX/RXD

(S3,4)

16.SB_MUTE

17.SW_SUM

18.VOL_CLK

11.MIC

12.Z2_MUTE

13.MIC_MUTE

14.REC_MUTE

7.PORTABLE_R

2.HPGND

2.HP_FL

1.MUTE_B+

6.AGND

4.HP_FR

11.AGND

9.AGND

15.AGND

14.SIRIUS_R

13.GNDA

19.AGND

17.AGND

24.TUNER_R

23.AGND

22.TUNER_L

27.SW_MUTE

26.SW_OUT

13.SBR

CP401

10.AGND

..

(MAIN)

4

4.+12V

3.+12V

1.DGND1

(D-MAIN)

4.DGND1

2.+12V

1.+12V

17.COMP_DET

14.GNDD

15.CVBS_IN

13.CR_IN

17

11.CB_IN

10.GNDD

9.Y_IN

.
.

9

10

5.CR_OUT

7.CV_OUT

6.GNDD

2.GNDD

1.Y-OUT

11

8.OSD_CLK

9.U/DGND

10.+5V

4.NJW1327_SCL

5.OSD_RST

6.OSD_CE

1.F_VIDEO

2.GNDD

(MAIN)

3

2.DGND2

1.DGND2

14.GNDD

15.CVBS_IN

16.CVBS_DET

10.GNDD

11.CB_IN

12.GNDD

(MAIN)

6.GNDD

8.GNDD

7.CVBS_OUT

2.GNDD

1.Y-OUT

3.CB_OUT

(MAIN)

8.OSD_CLK

9.U/DGND

5.OSD_RST

6.OSD_CE

4.NJW1327_SCL

1.F_VIDEO

3

(D-MAIN)

31
.

2

CP404

3.ASO_DET

4.RADI_DET

(CPU)

1.DC_DET4

27.HDMI_5V

28.GND-H

29.THRU_LED

24.4588_PDN

25.DSD_SEL

20.DSP_SCL

21.DSP_SDA

22.4588_SCL

17.DSP_CS

18.DSP_SDOUT

19.DSP_RST

14.SUB_ON

15.HDMI_SEL

11.SUB_PDN

12.MAIN_IRQ

7.CSCK_MAIN

8.SCDO_MAIN

9.SCDI_MAIN

4.CPU_ST_VCC

5.ST_H+5V

6.RX_MUTE

1.GNDU

2.GNDU

CN404

CP204

9.REC_MUTE

10.MIC_MUTE

11.Z2_MUTE

6.SW_SUM

7.SB/Z2_MUTE

2.MIC_SEL

3.MIC_DET

4.VOL_DATA

CP16

CP14

15.DC_DET

16.FL-30V

17.GNDU

14.NC

11.S_RLY

12.C_RLY

10.SB_RLY

7.MUTE_B+

8.H/P_RLY

6.GNDU

4.TUNER_SDIO

3.TUNER_SEN

2.TUNER_RST

9.BT_/OC

6.BT_DET

5.BT_ID

7.BT_RX

2.SIRIUS_RX/TXD

3.SIRIUS_P/E

1.SIRIUS_TX/RXD

8.DC_TRG+12V

9.AGND

6.OSD_CLK

4.OSD_CE1

5.OSD_DATA

2.1327_SCL

1.1327_SDA

8.GNDV

9.CVBS_IN

10.CVBS_DET

3.Y_IN

4.GNDV

5.CB_IN

1.+5V

CN209
(BRIDGE_A)

16.GNDA

11.SL_OUT

12.GNDA

7.FL_OUT

3.AIN_L

18.GNDA

14.GNDA

13.C_OUT

9.SR_OUT

5.FR_OUT

1.AIN_R

4.H/P DET

3.HP_R

2

5.U_PWR_ON

1.USB_RST

12.GNDA

13

CP402

15.AMUTE

10.GNDA

5.GNDA

9.PORTABLE_L

19.VOL_DATA

4.+6.8V

27.MUTE_B+

13.GNDA

18.VIDEO_R

27

1

4.UART-RX/TXD

15.AMUTE

10.GNDA

9.PORTABLE_L

19.VOL_DATA

2

(D-MAIN)

16.SIRIUS_L

8.AGND

3.GND_HP

25.AGND

21.AGND

20.BT_R

11.SBL

12.AGND

2.DGND1

CP1304

3.DGND1

16.CVBS_DET

12.GNDD

921 9P

ONLY

16

4.GNDD

8.GNDD

3.CB_OUT

11.-5V

10

3.NJW1327_SDA

7.OSD_DATA

CN6

17.COMP_DET

13.CR_IN

921 9P

ONLY

5.CR_OUT

4.GNDD

7.OSD_DATA

3.NJW1327_SDA

CN1304

(CPU)

2.DC_DET3

5.TRTHER_DET

CN204

23.4588_SDA

26.HDMI+12V

10.SUB_RST

13.SUB_IRQ

16.DSP_RDY

3.CPU_ST_VCC

4

1.HP_DET

5.VOL_CLK

8.A_MUTE

CP11

CP12

13.F_RLY

9.SPK_FH/B_RLY

5.TUNER_SCLK

1.TUNER_INT

8.BT_TX

4.BT_ON/OFF/CE

7.H+5V

3.OSD_RST1

6.GNDV

11.COMP_DET

7.CR_IN

2.GNDV

CN201

921 ONLY

3.VIDEO_R

19.SBL_OUT

15.SW_OUT

17.SBR_OUT

CN210

10.MIC_SEL

7.GNDA

6.POT_L

(BRIDGE_B)

4.POT_R

2.GNDA

17.SBR_OUT

19.SBL_OUT

(BRIDGE_B)

CP1303

(MAIN)

5.TR_THERMAL

4.RADI_THERMAL

3.ASO_DET

1.DC_DET4

5.VIDEO_V

1.VIDEO_L

(MAIN)

(CPU)

(BRIDGE_B)

(CPU)

10.GNDV

11.+5V

6.GNDV

7.CB_IN

2.CVBS_DET

3.CVBS_IN

1.COMP_DET

(VIDEO)

4.GNDV

(VIDEO)

1.VIDEO_L

5.VIDEO_V

(921/821 ONLY)

(BRIDGE_A)

9.MIC_DET

8.MICOUT

5.GNDA

1.+6.8V

(AUDIO)

CN400

2.DC_DET3

CP7

3.VIDEO_R

(921/821 only)

CN704B

(921/821:31P
521:27P)

5.CR_IN

8.GNDV

9.Y_IN

(AUDIO)

5

6 7 8

A

B

C

5

6 7 8

VSX-821-K

D

E

F

15

1

U

USB ASSY (VSX-821-K only)

M

F-VIDEO ASSY
(VSX-821-K only)

N

FRONT ASSY

A

AUDIO ASSY

D

MAIN ASSY

F

HEADPHONE ASSY

G

MIC ASSY

V

BT ASSY

2 3 4

4.2 AUDIO BLOCK DIAGRAM (for VSX-821-K, VSX-521-K)

A

B

C

D

E

F

16

VSX-821-K

1

2 3 4

5

D

MAIN ASSY

C

AMP ASSY

D

MAIN ASSY

E

SUBWOOFER
ASSY

6 7 8

A

B

C

D

E

F

VSX-821-K

5

6 7 8

17

1

U

USB ASSY

M

F-VIDEO ASSY

N

FRONT ASSY

A

AUDIO ASSY

D

MAIN AS

F

HEADPHONE ASSY

G

MIC ASSY

BT ASSY

V

Not
used

Not
used

2 3 4

4.3 AUDIO BLOCK DIAGRAM (for VSX-921-K)

A

B

C

D

E

F

18

VSX-821-K

1

2 3 4

5

D

MAIN ASSY

B

AMP ASSY

D

MAIN ASSY

E

SUBWOOFER
ASSY

6 7 8

A

B

C

D

E

F

VSX-821-K

5

6 7 8

19

1

T

D-MAIN ASSY

VSX-821 only

2 3 4

4.4 D-MAIN BLOCK DIAGRAM (for VSX-821-K, VSX-521-K)

A

B

C

D

E

F

20

1

2 3 4

VSX-821-K

5

6 7 8

A

B

C

D

E

F

VSX-821-K

5

6 7 8

21

1

T

D-MAIN ASSY

2 3 4

4.5 D-MAIN BLOCK DIAGRAM (for VSX-921-K)

A

B

C

D

E

F

22

1

2 3 4

VSX-821-K

5

6 7 8

A

B

C

D

E

F

VSX-821-K

5

6 7 8

23