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ORDER NO.
RRV3765
VSX-LX51
AUDIO/VIDEO MULTI-CHANNEL RECEIVER
VSX-LX51
VSX-1018AH-K
VSX-1018AH-S
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
Model Type Power Requirement Remarks
VSX-LX51 HYSXJ5 AC 220 V to 230 V
VSX-1018AH-K YSXJ5 AC 220 V to 230 V
VSX-1018AH-S YSXJ5 AC 220 V to 230 V
For details, refer to "Important Check Points for good servicing".
T-ZZV MAY 2008 Printed in Japan
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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.
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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-LX51 3
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CONTENTS
SAFETY INFORMATION ..........................................................................................................................................................2
1. SERVICE PRECAUTIONS ....................................................................................................................................................6
A 2. SPECIFICATIONS .................................................................................................................................................................7
2.1 ACCESSORIES ..............................................................................................................................................................7
2.2 SPECIFICATIONS...........................................................................................................................................................8
2.3 PANEL FACILITIES .........................................................................................................................................................9
3. BASIC ITEMS FOR SERVICE.............................................................................................................................................14
3.1 CHECK POINTS AFTER SERVICING..........................................................................................................................14
3.2 PCB LOCATIONS .........................................................................................................................................................15
3.3 JIGS LIST .....................................................................................................................................................................17
4. BLOCK DIAGRAM...............................................................................................................................................................18
4.1 OVERALL WIRING DIAGRAM......................................................................................................................................18
4.2 BLOCK DIAGRAM FOR AUDIO BLOCK ......................................................................................................................20
4.3 BLOCK DIAGRAM FOR VIDEO BLOCK ......................................................................................................................21
B 4.4 BLOCK DIAGRAM FOR HDMI FOR VSX-LX51 ...........................................................................................................23
4.5 BLOCK DIAGRAM FOR HDMI FOR VSX-1018AH ......................................................................................................24
4.6 BLOCK DIAGRAM FOR USB BLOCK ..........................................................................................................................25
4.7 BLOCK DIAGRAM FOR U-COM ..................................................................................................................................26
4.8 BLOCK DIAGRAM FOR POWER SUPPLY BLOCK .....................................................................................................27
5. DIAGNOSIS.........................................................................................................................................................................28
5.1 DIAGNOSIS FLOWCHART...........................................................................................................................................28
5.2 CIRCUIT DESCRIPTION ..............................................................................................................................................61
6. SERVICE MODE .................................................................................................................................................................64
6.1 TEST MODE .................................................................................................................................................................64
7. DISASSEMBLY....................................................................................................................................................................67
8. EACH SETTING AND ADJUSTMENT ................................................................................................................................71
C
8.1 HOW TO UPDATE FIRMWARE ....................................................................................................................................71
9. EXPLODED VIEWS AND PARTS LIST...............................................................................................................................76
9.1 PACKING SECTION .....................................................................................................................................................76
9.2 EXTERIOR SECTION...................................................................................................................................................78
9.3 CHASSIS SECTION .....................................................................................................................................................80
9.4 POWER AMP SECTION...............................................................................................................................................82
9.5 FRONT PANEL SECTION ............................................................................................................................................84
10. SCHEMATIC DIAGRAM ....................................................................................................................................................86
10.1 AUDIO IN ASSY (1/2) .................................................................................................................................................86
10.2 AUDIO IN ASSY (2/2) .................................................................................................................................................88
10.3 MAIN ASSY (1/4) ........................................................................................................................................................90
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10.4 MAIN ASSY (2/4) ........................................................................................................................................................92
10.5 MAIN ASSY (3/4) ........................................................................................................................................................94
10.6 MAIN ASSY (4/4) ........................................................................................................................................................96
10.7 DSP & USB ASSY (1/5) ..............................................................................................................................................98
10.8 DSP & USB ASSY (2/5) ............................................................................................................................................100
10.9 DSP & USB ASSY (3/5) ............................................................................................................................................102
10.10 DSP & USB ASSY (4/5) ..........................................................................................................................................104
10.11 DSP & USB ASSY (5/5) ..........................................................................................................................................106
10.12 FRONT IN ASSY.....................................................................................................................................................108
10.13 INTERFACE ASSY .................................................................................................................................................110
10.14 HDMI & DVC ASSY (1/2) (VSX-LX51) ....................................................................................................................112
10.15 HDMI & DVC ASSY (2/2) (VSX-LX51) ....................................................................................................................114
E 10.16 HDMI ASSY (VSX-1018AH)....................................................................................................................................116
10.17 BINDER, BIND L FRONT, BIND L BACK, BIND R FRONT and BIND R BACK ASSYS ........................................118
10.18 POSI1, POSI2 and POSI3 ASSYS .........................................................................................................................119
10.19 DISPLAY ASSY.......................................................................................................................................................120
10.20 MULTI JOG, POWER SW, DIODE, HEADPHONE, PRIMARY and DC/DC ASSYS...............................................122
10.21 POWER AMP ASSY (1/2).......................................................................................................................................124
10.22 POWER AMP ASSY (2/2).......................................................................................................................................126
10.23 PRE-STAGE AMP ASSY ........................................................................................................................................128
10.24 REGULATOR ASSY................................................................................................................................................130
11. PCB CONNECTION DIAGRAM ......................................................................................................................................133
11.1 AUDIO IN ASSY........................................................................................................................................................134
11.2 MAIN ASSY ..............................................................................................................................................................138
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11.3 DSP & USB ASSY ....................................................................................................................................................142
11.4 FRONT IN ASSY.......................................................................................................................................................144
11.5 INTERFACE ASSY ...................................................................................................................................................146
11.6 HDMI & DVC ASSY (VSX-LX51) ..............................................................................................................................148
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11.7 HDMI ASSY (VSX-1018AH) ..................................................................................................................................... 152
11.8 BINDER, BIND L FRONT and BIND L BACK ASSYS .............................................................................................. 154
11.9 BIND R FRONT and BIND R BACK ASSYS ............................................................................................................ 155
11.10 DISPLAY, MULTI JOG and POWER SW ASSYS ................................................................................................... 156
11.11 DIODE ASSY.......................................................................................................................................................... 160 A
11.12 HEADPHONE ASSY .............................................................................................................................................. 161
11.13 POWER AMP ASSY ............................................................................................................................................... 162
11.14 PRE-STAGE AMP ASSY ........................................................................................................................................ 166
11.15 PRIMARY ASSY ..................................................................................................................................................... 170
11.16 REGULATOR ASSY ............................................................................................................................................... 172
11.17 DC/DC ASSY.......................................................................................................................................................... 174
11.18 POSI1, POSI2 and POSI3 ASSYS ......................................................................................................................... 175
12. PCB PARTS LIST............................................................................................................................................................ 176
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VSX-LX51 5
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1. SERVICE PRECAUTIONS
1.1 NOTES ON SOLDERING