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ORDER NO.
RRV4167
VSX-821-K
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
For details, refer to "Important Check Points for good servicing".
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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.
WARNING
B 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
(FOR USA MODEL ONLY)
ANY MEASUREMENTS NOT WITHIN THE LIMITS
1. SAFETY PRECAUTIONS
OUTLINED ABOVE ARE INDICATIVE OF A POTENTIAL
The following check should be performed for the
SHOCK HAZARD AND MUST BE CORRECTED BEFORE
continued protection of the customer and service
RETURNING THE APPLIANCE TO THE CUSTOMER.
technician.
C LEAKAGE CURRENT CHECK
Measure leakage current to a known earth ground 2. PRODUCT SAFETY NOTICE
(water pipe, conduit, etc.) by connecting a leakage Many electrical and mechanical parts in the appliance
current tester such as Simpson Model 229-2 or have special safety related characteristics. These are
equivalent between the earth ground and all exposed often not evident from visual inspection nor the protection
metal parts of the appliance (input/output terminals, afforded by them necessarily can be obtained by using
screwheads, metal overlays, control shaft, etc.). Plug replacement components rated for voltage, wattage, etc.
the AC line cord of the appliance directly into a 120 V Replacement parts which have these special safety
AC 60 Hz outlet and turn the AC power switch on. Any characteristics are identified in this Service Manual.
current measured must not exceed 0.5 mA. Electrical components having such features are
identified by marking with a > on the schematics and on
D
the parts list in this Service Manual.
Reading should The use of a substitute replacement component which
Leakage not be above does not have the same safety characteristics as the
Device current 0.5 mA
under tester PIONEER recommended replacement one, shown in the
test parts list in this Service Manual, may create shock, fire,
Test all or other hazards.
exposed metal
surfaces 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
Also test with Manual. A subscription to, or additional copies of,
plug reversed Earth PIONEER Service Manual may be obtained at a nominal
E (Using AC adapter ground
plug as required) charge from PIONEER.
AC Leakage Test
F
2 VSX-821-K
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5 6 7 8
A
[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.
B
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.
C
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.
D
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.
3. Lubricants, Glues, and Replacement parts E
Use grease and adhesives that are equal to the specified substance.
Make sure the proper amount is applied.
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.
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 F
installed before shipment. Please be sure to follow this method especially if it is specified in this manual.
VSX-821-K 3
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1 2 3 4
CONTENTS
SAFETY INFORMATION ..........................................................................................................................................................2
1. SERVICE PRECAUTIONS ....................................................................................................................................................5
A
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
B 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
C 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 MAIN 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
D 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
E 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 ASSY (VSX-821-K, VSX-921-K only) .............................................................................................................144
11.14 BT ASSY .................................................................................................................................................................145
12. PCB PARTS LIST ............................................................................................................................................................146
F
4 VSX-821-K
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1. SERVICE PRECAUTIONS
1.1 NOTES ON SOLDERING
A