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ORDER NO.
RRV3841
SC-LX81

AUDIO/VIDEO MULTI-CHANNEL RECEIVER

SC-LX81
SC-LX71
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
Model Type Power Requirement Remarks

SC-LX81 HYSXJ5 AC 220 V to 230 V

SC-LX71 HYSXJ5 AC 220 V to 230 V

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

PIONEER CORPORATION 4-1, Meguro 1-chome, Meguro-ku, Tokyo 153-8654, 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 2008
T-ZZV AUG. 2008 Printed in Japan
1 2 3 4

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.

E 3. Lubricants, Glues, and Replacement parts
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.

2 SC-LX81
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CONTENTS
1. SERVICE PRECAUTIONS .................................................................................................................................................... 5
1.1 NOTES ON SOLDERING ............................................................................................................................................... 5
1.2 NOTES ON REPLACING PARTS ................................................................................................................................... 5 A
1.3 NOTES ON ASSEMBLING............................................................................................................................................. 6
2. SPECIFICATIONS................................................................................................................................................................. 8
2.1 ACCESSORIES .............................................................................................................................................................. 8
2.2 SPECIFICATIONS .......................................................................................................................................................... 9
2.3 PANEL FACILITIES....................................................................................................................................................... 10
3. BASIC ITEMS FOR SERVICE ............................................................................................................................................ 16
3.1 CHECK POINTS AFTER SERVICING ......................................................................................................................... 16
3.2 PCB LOCATIONS ......................................................................................................................................................... 17
3.3 JIGS LIST ..................................................................................................................................................................... 19
4. BLOCK DIAGRAM .............................................................................................................................................................. 20
4.1 OVERALL WIRING DIAGRAM ..................................................................................................................................... 20
4.2 AUDIO BLOCK DIAGRAM............................................................................................................................................ 22 B
4.3 DSP BLOCK DIAGRAM................................................................................................................................................ 24
4.4 HDMI NETWORK BLOCK DIAGRAM .......................................................................................................................... 25
4.5 MICROCOMPUTER BLOCK DIAGRAM ...................................................................................................................... 26
4.6 POWER BLOCK DIAGRAM ......................................................................................................................................... 28
5. DIAGNOSIS ........................................................................................................................................................................ 30
5.1 DIAGNOSIS FLOWCHART .......................................................................................................................................... 30
5.2 CIRCUIT DESCRIPTION.............................................................................................................................................. 62
6. SERVICE MODE ................................................................................................................................................................. 70
6.1 TEST MODE................................................................................................................................................................. 70
7. DISASSEMBLY ................................................................................................................................................................... 75
8. EACH SETTING AND ADJUSTMENT ................................................................................................................................ 78
C
8.1 HOW TO UPDATE FIRMWARE.................................................................................................................................... 78
9. EXPLODED VIEWS AND PARTS LIST............................................................................................................................... 84
9.1 PACKING SECTION ..................................................................................................................................................... 84
9.2 EXTERIOR SECTION .................................................................................................................................................. 86
9.3 CHASSIS SECTION ..................................................................................................................................................... 88
9.4 REAR PANEL SECTION .............................................................................................................................................. 90
9.5 FRONT PANEL SECTION ............................................................................................................................................ 92
10. SCHEMATIC DIAGRAM .................................................................................................................................................... 94
10.1 AUDIO ASSY .............................................................................................................................................................. 94
10.2 D-MOTHER ASSY (1/4).............................................................................................................................................. 96
10.3 D-MOTHER ASSY (2/4).............................................................................................................................................. 98
10.4 D-MOTHER ASSY (3/4)............................................................................................................................................ 100 D
10.5 D-MOTHER ASSY (4/4)............................................................................................................................................ 102
10.6 FRONT IN and V-BRIDGE ASSYS........................................................................................................................... 104
10.7 232C & CONTROL ASSY......................................................................................................................................... 106
10.8 HDMI NETWORK ASSY (1/6) .................................................................................................................................. 108
10.9 HDMI NETWORK ASSY (2/6) .................................................................................................................................. 110
10.10 HDMI NETWORK ASSY (3/6) ................................................................................................................................ 112
10.11 HDMI NETWORK ASSY (4/6) ................................................................................................................................ 114
10.12 HDMI NETWORK ASSY (5/6) ................................................................................................................................ 116
10.13 HDMI NETWORK ASSY (6/6) ................................................................................................................................ 118
10.14 INTERFACE ASSY ................................................................................................................................................. 120
10.15 COMPONENT ASSY.............................................................................................................................................. 122
10.16 COMPOSITE S ASSY ............................................................................................................................................ 124 E
10.17 FRONT BRIDGE ASSY .......................................................................................................................................... 126
10.18 DISPLAY, VOL and POWER SW ASSYS ............................................................................................................... 128
10.19 PRE BRIDGE, ICE BUFFER, ICE SHIELD and PRIMARY GUARD ASSYS ......................................................... 130
10.20 ICE INTERFACE and ZOUT ASSYS ...................................................................................................................... 132
10.21 ICEPOWER AMP (1/5) ........................................................................................................................................... 134
10.22 ICEPOWER AMP (2/5) ........................................................................................................................................... 136
10.23 ICEPOWER AMP (3/5) ........................................................................................................................................... 138
10.24 ICEPOWER AMP (4/5) ........................................................................................................................................... 140
10.25 ICEPOWER AMP (5/5) ........................................................................................................................................... 142
10.26 PRIMARY ASSY ..................................................................................................................................................... 144
10.27 REG ASSY ............................................................................................................................................................. 146
F
10.28 ICE REG ASSY ...................................................................................................................................................... 148
10.29 B REG ASSY .......................................................................................................................................................... 150
10.30 B DIODE, DCDC, and HDMI RECT ASSYS........................................................................................................... 152
11. PCB CONNECTION DIAGRAM ...................................................................................................................................... 153
SC-LX81 3
5 6 7 8
1 2 3 4

11.1 AUDIO ASSY ............................................................................................................................................................154
11.2 D-MOTHER ASSY ....................................................................................................................................................158
11.3 FRONT IN ASSY.......................................................................................................................................................162
11.4 232C & CONTROL ASSY .........................................................................................................................................163
A 11.5 HDMI NETWORK ASSY ...........................................................................................................................................164
11.6 INTERFACE ASSY ...................................................................................................................................................168
11.7 COMPONENT and V BRIDGE ASSYS.....................................................................................................................172
11.8 COMPOSITE S ASSY ..............................................................................................................................................176
11.9 FRONT BRIDGE ASSY ............................................................................................................................................178
11.10 DISPLAY, POWER SW and VOL ASSYS ...............................................................................................................180
11.11 PRE BRIDGE, ICE BUFFER and ICE SHIELD ASSYS..........................................................................................184
11.12 ICE INTERFACE ASSY ..........................................................................................................................................186
11.13 ICEPOWER AMP ASSY .........................................................................................................................................188
11.14 ZOUT, PRIMARY GUARD and REG ASSYS ..........................................................................................................192
11.15 PRIMARY ASSY .....................................................................................................................................................196
11.16 ICE REG ASSY.......................................................................................................................................................198
B
11.17 B DIODE and B REG ASSYS .................................................................................................................................200
11.18 DCDC and HDMI RECT ASSYS.............................................................................................................................202
12. ELECTRICAL PARTS LIST .............................................................................................................................................203

4 SC-LX81
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1. SERVICE PRECAUTIONS
1.1 NOTES ON SOLDERING

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