Pioneer VSX-LX52 User manual

ORDER NO.
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
2009
2009 Printed in Japan
VSX-LX52
RRV3933
AUDIO/VIDEO MULTI-CHANNEL RECEIVER
VSX-LX52
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
Model Type Power Requirement Remarks
VSX-LX52 SYXJ5 AC 220 V to 230 V
For details, refer to "Important Check Points for good servicing".
T- Z Z V M AY

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SAFETY INFORMATION
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 120V
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)
WARNING
This product contains lead in solder and certain electrical parts contain chemicals which are known to the state of California to
cause cancer, birth defects or other reproductive harm.
Health & Safety Code Section 25249.6 - Proposition 65
NOTICE
(FOR CANADIAN MODEL ONLY)
Fuse symbols (fast operating fuse) and/or (slow operating fuse) on PCB indicate that replacement parts must
be of identical designation.
REMARQUE
(POUR MODÈLE CANADIEN SEULEMENT)
Les symboles de fusible (fusible de type rapide) et/ou (fusible de type lent) sur CCI indiquent que les pièces
de remplacement doivent avoir la même désignation.
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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[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.
aSafe 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.

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CONTENTS
SAFETY INFORMATION ..........................................................................................................................................................2
1. SERVICE PRECAUTIONS ....................................................................................................................................................6
1.1 NOTES ON SOLDERING ...............................................................................................................................................6
1.2 NOTES ON REPLACING................................................................................................................................................6
1.3 CAUTION ........................................................................................................................................................................6
2. SPECIFICATIONS .................................................................................................................................................................7
2.1 SPECIFICATIONS...........................................................................................................................................................7
2.2 PANEL FACILITIES .........................................................................................................................................................8
3. BASIC ITEMS FOR SERVICE.............................................................................................................................................13
3.1 CHECK POINTS AFTER SERVICING..........................................................................................................................13
3.2 PCB LOCATIONS .........................................................................................................................................................14
3.3 JIGS LIST......................................................................................................................................................................15
4. BLOCK DIAGRAM...............................................................................................................................................................16
4.1 OVERALL WIRING DIAGRAM......................................................................................................................................16
4.2 BLOCK DIAGRAM FOR DIGITAL AUDIO BLOCK........................................................................................................18
4.3 BLOCK DIAGRAM FOR ANALOG AUDIO BLOCK ......................................................................................................20
4.4 BLOCK DIAGRAM FOR DIGITAL VIDEO BLOCK........................................................................................................21
4.5 BLOCK DIAGRAM FOR ANALOG VIDEO BLOCK (1/2)..............................................................................................22
4.6 BLOCK DIAGRAM FOR ANALOG VIDEO BLOCK (2/2)..............................................................................................24
4.7 BLOCK DIAGRAM FOR U-COM BLOCK .....................................................................................................................25
4.8 BLOCK DIAGRAM FOR POWER BLOCK ....................................................................................................................26
5. DIAGNOSIS.........................................................................................................................................................................28
5.1 DIAGNOSIS FLOWCHART...........................................................................................................................................28
5.2 CIRCUIT DESCRIPTION ..............................................................................................................................................45
6. SERVICE MODE .................................................................................................................................................................50
6.1 TEST MODE .................................................................................................................................................................50
7. DISASSEMBLY....................................................................................................................................................................52
8. EACH SETTING AND ADJUSTMENT ................................................................................................................................60
8.1 HOW TO UPDATE FIRMWARE ....................................................................................................................................60
9. EXPLODED VIEWS AND PARTS LIST...............................................................................................................................64
9.1 PACKING SECTION......................................................................................................................................................64
9.2 EXTERIOR SECTION...................................................................................................................................................66
9.3 REAR SECTION ...........................................................................................................................................................68
9.4 FRONT SECTION.........................................................................................................................................................70
10. SCHEMATIC DIAGRAM ....................................................................................................................................................72
10.1 AUDIO ASSY ..............................................................................................................................................................72
10.2 COMPOSITE (1/2) and V-BRIDGE ASSYS ................................................................................................................74
10.3 COMPOSITE ASSY (2/2)............................................................................................................................................76
10.4 COMPONENT ASSY (1/2)..........................................................................................................................................78
10.5 COMPONENT ASSY (2/2)..........................................................................................................................................80
10.6 DIGITAL MAIN ASSY (1/11)........................................................................................................................................82
10.7 DIGITAL MAIN ASSY (2/11)........................................................................................................................................88
10.8 DIGITAL MAIN ASSY (3/11)........................................................................................................................................90
10.9 DIGITAL MAIN ASSY (4/11)........................................................................................................................................92
10.10 DIGITAL MAIN ASSY (5/11)......................................................................................................................................94
10.11 DIGITAL MAIN ASSY (6/11)......................................................................................................................................96
10.12 DIGITAL MAIN ASSY (7/11)......................................................................................................................................98
10.13 DIGITAL MAIN ASSY (8/11)....................................................................................................................................100
10.14 DIGITAL MAIN ASSY (9/11)....................................................................................................................................102
10.15 DIGITAL MAIN ASSY (10/11)..................................................................................................................................104
10.16 DIGITAL MAIN ASSY (11/11)..................................................................................................................................106
10.17 FRONT MIC & VIDEO ASSY ..................................................................................................................................108
10.18 FRONT HDMI & USB ASSY ...................................................................................................................................110
10.19 POWER AMP ASSY (1/2).......................................................................................................................................112
10.20 POWER AMP ASSY (2/2).......................................................................................................................................114
10.21 PRESTAGE ASSY...................................................................................................................................................116
10.22 DISPLAY ASSY.......................................................................................................................................................118
10.23 PRIMARY, UNREG and XM REGULATOR ASSYS ................................................................................................120
10.24 REGULATOR ASSY................................................................................................................................................122
10.25 POWER SW, ENCODER, HEAD PHONE and DIODE ASSYS ..............................................................................124
10.26 BRIDGE 1 and 2 ASSYS ........................................................................................................................................125
10.27 POSI 1-3, BIND L FRONT and BACK, BIND R FRONT and BACK ASSYS...........................................................126
10.28 BINDER and DISP-FFC GUARD ASSYS ...............................................................................................................127
11. PCB CONNECTION DIAGRAM ......................................................................................................................................128
11.1 AUDIO ASSY ............................................................................................................................................................128

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11.2 COMPOSITE and V-BRIDGE ASSYS ...................................................................................................................... 132
11.3 COMPONENT ASSY................................................................................................................................................ 134
11.4 DIGITAL MAIN ASSY................................................................................................................................................ 136
11.5 FRONT MIC & VIDEO and FRONT HDMI & USB ASSYS ....................................................................................... 140
11.6 POWER AMP ASSY................................................................................................................................................. 142
11.7 PRESTAGE ASSY .................................................................................................................................................... 146
11.8 DISPLAY ASSY ........................................................................................................................................................ 148
11.9 PRIMARY ASSY ....................................................................................................................................................... 152
11.10 UNREG, XM REGULATOR and REGULATOR ASSYS.......................................................................................... 154
11.11 POWER SW, ENCODER, HEAD PHONE, DIODE, BRIDGE 1 and 2 ASSYS....................................................... 158
11.12 POSI 1-3, BIND L FRONT and BACK and BIND R FRONT ASSYS...................................................................... 160
11.13 BIND R BACK, BINDER and DISP-FFC GUARD ASSYS...................................................................................... 162
12. PCB PARTS LIST............................................................................................................................................................ 163

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1. SERVICE PRECAUTIONS
1.1 NOTES ON SOLDERING
1.2 NOTES ON REPLACING
1.3 CAUTION
• 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.
The part listed below is difficult to replace as a discrete component part.
When the part listed in the table is defective, replace whole Assy.
IC800 EMMA2RL2 UPD61283F1-407LU2A BGA
IC1501 HDMI Receiver SII9233ACTU IC with heat-pad
DIGITAL MAIN
ASSY
ASSY NAME Ref No. Part No. RemarksFUNCTION PCB ASSY Part No. Parts that is Diffcult to Replace
AWX9420
• Discharging
Please refer to page 52, “Preparations Before Perfoming Diagnosis of the POWER AMP Assy”.
• Ground Points
Please refer to page 53, “Ground Points”.

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2. SPECIFICATIONS
2.1 SPECIFICATIONS
These specifications are applicable when the power•
supply is 230 V.
Audio section
Rated power output (1 kHz, 6 Ω, 1 %)
Front . . . . . . . . . . . . . . . . . . . . . . . . . . . .150 W+ 150 W
Center. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 W
Surround. . . . . . . . . . . . . . . . . . . . . . . . .150 W+ 150 W
Surround back . . . . . . . . . . . . . . . . . . . .150 W+ 150 W
Rated power output (20 Hz to 20 kHz, 8Ω, 0.09 %)
Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 W+ 110 W
Center. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 W
Surround. . . . . . . . . . . . . . . . . . . . . . . . . 11
11
0 W+ 110 W
Surround back . . . . . . . . . . . . . . . . . . . . 110 W+ 110 W
Total Harmonic Distortion. . . . . . . . . . . . . . . . . . . . 0.06 %
(20 Hz to 20 kHz, 8Ω, 100 W+ 100 W)
Guaranteed speaker impedance
. . . . . 16 Ωto 8Ω, less than 8Ωto 6 Ω(setting required)
Signal-to-Noise Ratio (IHF, short circuited, A network)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 dB
Frequency Response. . . . . . . . . 5 Hz to 100 000 Hz dB
(Pure Direct Mode)
Input (Sensitivity/Impedance) . . . . . . . . . . 300 mV/47 kΩ
Output (Level/Impedance)
REC . . . . . . . . . . . . . . . . . . . . . . . . . . . .300 mV/2.2 kΩ
Tuner Section
Frequency Range (FM) . . . . . . . . . . 87.5 MHz to 108MHz
Antenna Input (FM) . . . . . . . . . . . . . . . . 75 Ωunbalanced
Frequency Range (AM) . . . . . . . . . . 531 kHz to 1602 kHz
Antenna (AM) . . . . . . . . . . . . . . .Loop antenna (balanced)
Video Section
Signal level
Composite/S-Video . . . . . . . . . . . . . . . . . 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)
(Video convert off)
Digital In/Out Section
HDMI terminal . . . . . . . . . . . . . . . . . . . . . 19-pin (Not DVI)
HDMI output type . . . . . . . . . . . . . . . . . . . . . . 5 V, 100 mA
USB terminal . . . . . . . . . . . . USB2.0 Full Speed (Type A)
iPod terminal . . . . . . . . . . . .USB, and Video (Composite)
Integrated control section
Control (SR) terminal . . . . . . . . . Ø 3.5 Mini-jack (MONO)
Control (IR) terminal. . . . . . . . . . Ø 3.5 Mini-jack (MONO)
IR signal . . . . . . . . . . . . . . High Active (High Level: 2.0 V)
12 VTrigger terminal . . . . . . . . . Ø 3.5 Mini-jack (MONO)
12 VTrigger output type. . . . . . . . . . . . . 12 V, Total 50 mA
RS-232C cable type. . . . 9-pin, cross type, female-female
Miscellaneous
Power requirements . . . . AC 220 Vto 230 V, 50 Hz/60 Hz
Power consumption . . . . . . . . . . . . . . . . . . . . . . . . . 410 W
In standby. . . . . . . . . . . . . . . .0.5 W(KURO LINK OFF)
0.8W(KURO LINK ON)
Dimensions . . . 420 (W) mm x 173 (H) mm x 433 (D) mm
Weight (without package). . . . . . . . . . . . . . . . . . . . 13.5 kg
Furnished Parts Number
MCACC Setup microphone (APM7009) . . . . . . . . . . . . . 1
Remote control unit (AXD7547) . . . . . . . . . . . . . . . . . . . . 1
AA/IEC R6 dry cell batteries . . . . . . . . . . . . . . . . . . . . . . 2
iPod cable (ADE7129) . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
AM loop antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
FM wire antenna. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Power cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Warranty card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Operating instructions
Note
Specifications and the design are subject to•
possible modifications without notice, due to
improvements.
Manufactured under license from Dolby Laboratories.
Dolby, Pro Logic, Surround EX and the double-D symbol
are trademarks of Dolby Laboratories.
Manufactured under license under U.S. Patent
#’s: 5,451,942; 5,956,674; 5,974,380; 5,978,762;
6,226,616; 6,487,535; 7,212,872; 7,333,929;
7,392,195; 7,272,567 & other U.S. and worldwide
patents issued & pending. DTS is a registered
trademark and the DTS logos, Symbol, DTS-HD
and DTS-HD Master Audio are trademarks of
DTS, Inc. © 1996-2008 DTS, Inc. All Rights
Reserved.
Windows Media and the Windows logo are trademarks
or registered trademarks of Microsoft Corporation in the
United States and/or other countries.
iPod is a trademark of Apple Inc., registered in the U.S.
and other countries. iPhone is a trademark of Apple Inc.
THX, the THX logo and Select2 Plus are trademarks of
THX Ltd. which may be registered in some jurisdictions.
All rights reserved. All other trademarks are the property of
their respective owners.
“Neural Surround”, “Neural Audio”, “Neural” and “NRL” are
trademarks and logos owned by Neural Audio Corporation,
THX is a trademark of THX Ltd., which may be registered
in some jurisdictions. All rights reserved.

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2.2 PANEL FACILITIES
1 INPUT SELECTOR dial
Use to select an input function.
2 STANDBY/ON
Switches the receiver between on and standby. Power
indicator lights when the receiver is on.
When the KURO LINK function is set to ON, the power
indicator lights when the power is in standby.
3 Tuner controls
BAND – Switches between AM and FM radio bands.
TUNE +/– – Use to find radio frequencies.
PRESET +/– – Use to find preset stations.
TUNER EDIT – Use with TUNE +/–,PRESET +/– and
ENTER to memorize and name stations for recall.
4 PHASE CONTROL indicator – Lights to indicate
Phase Control is selected.
ADVANCED MCACC indicator – Lights when EQ is
set to ON in the AUDIO PARAMETER menu.
PQLS indicator – Lights when the PQLS feature is
active.
HDMI indicator – Blinks when connecting an
HDMI-equipped component; lights when the
component is connected.
5 Character display
6 ENTER
7 Remote sensor
Receives the signals from the remote control.
8 MASTER VOLUME dial
9 PHONES jack
Use to connect headphones. When the headphones are
connected, there is no sound output from the speakers.
10 Listening mode buttons
AUTO SURR/ALC/STREAM DIRECT – Switches
between Auto Surround, Auto level control mode and
Stream Direct mode.
STEREO – Switches between stereo playback and
Front Stage Surround Advance modes.
ADVANCED SURROUND – Use to switch between
the various surround modes.
STANDARD SURROUND – Press for Standard
decoding and to switch between the various Pro
Logic IIx and Neo:6 options.
HOME THX – Press to select a Home THX listening
mode.
11 SPEAKERS
Use to change speaker system.
12 MULTI-ZONE controls
If you’ve made MULTI-ZONE connections use these
controls to control the sub zone from the main zone.
13 MCACC SETUP MIC jack
Use to connect the supplied microphone.
14 iPod/iPhone/USB terminals
Use to connect your Apple iPod as an audio and video
source, or connect a USB device for audio and photo
playback.
15 HDMI input connector
Use for connection to compatible HDMI device (Video
camera, etc.).
[1] Front panel

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[2] Display
1 SIGNAL indicators
Light to indicate the currently selected input signal.
AUTO lights when the receiver is set to select the input
signal automatically.
2 Program format indicators
Light to indicate the channels being input when PCM
signals are being input. They do not indicate the audio
signals being output from the receiver.
L/R – Left front/Right front channel
C– Center channel
SL/SR – Left surround/Right surround channel
LFE – Low frequency effects channel (the (( ))
indicators light when an LFE signal is being input)
XL/XR – Two channels other than the ones above
XC – Either one channel other than the ones above, the
mono surround channel or matrix encode flag
3 Digital format indicators
Light when a signal encoded in the corresponding format
is detected.
4 S.RTRV
Lights when the Sound Retriever function is active.
5 MULTI-ZONE
Lights when the MULTI-ZONE feature is active.
6 DSD PCM – Light during DSD (Direct Stream Digital) to
PCM conversion with SACDs.
PCM – Lights during playback of PCM signals.
7 SOUND
Lights when any of the Midnight, Loudness or tone
controls feature is selected.
Lights when Dialog Enhancement is switched on.
8 UP MIX
Lights when the Up Mix is switched on.
9 Listening mode indicators
AUTO SURROUND – Lights when the Auto Surround
feature is switched on.
ALC – Lights when the ALC (Auto level control) mode
is selected.
STREAM DIRECT – Lights when Direct/Pure Direct is
selected.
ADV.SURROUND – Lights when one of the Advanced
Surround modes has been selected.
STEREO – Lights when stereo listening is switched on.
STANDARD – Lights when one of the Standard
Surround modes is switched on.
THX – Lights when one of the Home THX modes is
selected.
10 (PHASE CONTROL)
Lights when the Phase Control is switched on.
11 Analog signal indicators
Light to indicate reducing the level of an analog signal.
12 Tuner indicators
TUNED – Lights when a broadcast is being received.
STEREO – Lights when a stereo FM broadcast is being
received in auto stereo mode.
MONO – Lights when the mono mode is set using MPX.
RDS – Lights when an RDS broadcast is received.
13
Lights when the sound is muted.
14 Master volume level
Shows the overall volume level.
“---” indicates the minimum level, and “+12dB” indicates
the maximum level.
15 Input function indicators
Light to indicate the input function you have selected.
16 Scroll indicators
Light when there are more selectable items when making
the various settings.
17 Speaker indicators
Lights to indicate the current speaker system, Aand/or B.
18 SLEEP
Lights when the receiver is in sleep mode.
19 Matrix decoding format indicators
PRO LOGIC IIx – This lights to indicate Pro
Logic II / Pro Logic IIx decoding.
Neo:6 – When one of the Neo:6 modes of the receiver
is on, this lights to indicate Neo:6 processing.
20 MSTR
Lights during playback of DTS-HD Master Audio signal.
21 Character display
Displays various system information.
22 Remote control mode indicator
Lights to indicate the receiver’s remote control mode
setting. (Not displayed when set to 1.)

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[3] Rear panel
CAUTION
Before making or changing the connections, switch•
off the power and disconnect the power cord from the
power outlet. Plugging in should be the final step.
To avoid hum, do not lay connected cables over the•
top of the receiver.
1 HDMI connectors (x6)
Multiple inputs and two outputs for high-quality audio/
video connection to compatible HDMI devices.
2 Coaxial digital audio inputs (x2)
Use for digital audio sources, including DVD players/
recorders, digital satellite receivers, CD players, etc.
3 Optical digital audio output/input(s) (x4)
Use the OUT jack for recording to a CD or MiniDisc
recorder.
Use the IN jacks for digital audio sources, including DVD
players/recorders, digital satellite receivers, CD players,
etc.
4 Component video connectors input(s)/output (x3)
Use the inputs to connect any video source that has
component video output, such as a DVD player.
Use the output to connect monitor or TV.
5 MULTI-ZONE audio/video outputs
Use to connect a second or third amplifier and monitors
or TVs in a separate room.
6 Composite and S-Video monitor outputs
Use to connect monitors and TVs.
7 Audio/video source inputs/(outputs) (x5)
Use for connection to audio/visual sources, such as DVD
players/recorders, VCRs, etc. Each set of inputs has jacks
for composite video, S-Video and stereo analog audio.
8 Stereo analog audio source inputs/(outputs) (x3)
Use for connection to audio sources such as CD players,
tape decks, turntables, etc.
9 Multichannel analog audio inputs
5.1 channel inputs for connection to a DVD player with
multichannel analog outputs.
10 Multichannel pre-amplifier outputs
Use to connect separate amplifiers for front, center,
surround, surround back and subwoofer channels.
11 AM and FM antenna terminals
Use to connect indoor or outdoor antennas for radio
broadcasts.
12 RS-232C connector
Use for connection to a PC for graphical output when
using Advanced MCACC.
13 Control input/output
Use to connect other Pioneer components so that you
can control all your equipment from a single IR remote
sensor.
14 Remote inputs/output
Use for connection to an external remote control sensor
for use in a MULTI-ZONE setup, for example.
15 12 V trigger jacks (total 50 mA max.) (x2)
Use to switch components in your system on and off
according to the input function of the receiver.
16 Speaker terminals
Use for connection to the main front, center, surround
and surround back speakers.
17 AC power inlet
Connect the supplied power cord here.

11
VSX-LX52
56 7 8
56 7 8
A
B
C
D
E
F
The remote has been conveniently color-coded according
to component control using the following system:
•White – Receiver control, TVControl
• Blue – Other controls
1 RECEIVER
This switches between standby and on for this receiver.
2 Input function buttons
Press to select control of other components.
Use INPUT SELECT to select the input function.
3 Number buttons and other receiver/component
controls
Use the number buttons to directly select a radio
frequency or the tracks on a CD, DVD, etc.
ENTER can be used to enter commands for TVor DTV.
Press RECEIVER first to access:
HDMI OUT – Switch the HDMI output terminal.
SIGNAL SEL – Use to select an input signal.
MCACC – Press to switch between MCACC presets.
SLEEP – Use to put the receiver in sleep mode and
select the amount of time before sleep.
SBch – Use to select the surround back/virtual
surround back channel mode.
A.ATT – Attenuates (lowers) the level of an analog
input signal to prevent distortion.
DIMMER – Dims or brightens the display.
CH LEVEL – Press repeatedly to select a channel,
then use /to adjust the level.
Press TUNER first to access:
D.ACCESS – After pressing, you can access a radio
station directly using the number buttons.
CLASS – Switches between the seven banks (classes)
of radio station presets.
4 TV CONTROL buttons
These buttons are dedicated to control the TVassigned to
TV operation selector switch. Thus if you only have one TV
to hook up to this system assign it to the TV operation
selector switch.
– Use to turn on/off the power of the TV.
INPUT – Use to select the TVinput signal.
CH +/– – Use to select channels.
VOL +/– – Use to adjust the volume on your TV.
5 Tuner/component control buttons/HOME MENU
These button controls can be accessed after you have
selected the corresponding input function button (DVD,
DVR, TV, etc.).
Press RECEIVER first to access:
AUDIO PARAMETER – Use to access the Audio
options.
VIDEO PARAMETER – Use to access the Video
options.
HOME MENU – Use to access the Home Menu.
RETURN – Press to confirm and exit the current
menu screen (also use to return to the previous menu
with DVDs or to select closed captioning with DTV).
[4] Remote control
6 / / / (TUNE/PRESET) /ENTER
Use the arrow buttons when setting up your surround
sound system and the Audio or Video options. Also
used to control DVD menus/options and for deck 1 of a
double cassette deck player. Use TUNE /to find radio
frequencies and use PRESET /to find preset stations.

12 VSX-LX52
12 3 4
A
B
C
D
E
F
12 3 4
7 Component/Receiver control buttons
The main buttons ( , , etc.) are used to control a
component after you have selected it using the input
function buttons.
The controls above these buttons can be accessed after
you have selected the corresponding input function
button (for example DVD, DVR or TV). These buttons also
function as described below.
Press TUNER first to access:
MPX – Switches between stereo and mono reception
of FM broadcasts. If the signal is weak, then switching
to mono will improve the sound quality.
Press RECEIVER first to access:
AUTO/ALC/DIRECT – Switches between Auto
Surround, Auto level control mode and Stream Direct
mode.
STEREO – Switches between stereo playback and
Front Stage Surround Advance modes.
STANDARD – Press for Standard decoding and to
switch between the various Pro Logic IIx and
Neo:6 options.
ADV SURR – Use to switch between the various
surround modes.
THX – Press to select a Home THX listening mode.
PHASE CTRL – Press to switch on/off Phase Control.
STATUS – Press to check selected receiver settings.
PQLS – Press to select PQLS setting.
8 AUDIO – Changes the audio or channel on DVD or
BD discs.
DISP – Switches between named station presets and
radio frequencies.
CH +/– – Use to select channels for DVD/DVR units.
9 REMOTE SETUP
Use to input the preset code when making remote
control settings and to set the remote control mode.
10 TV CTRL
Use this button to set preset code of your TV’s
manufacturer when controlling TV.
11 MULTI-ZONE operation selector switch
Switch to perform operations in the main zone, ZONE 2
and ZONE 3.
12 Remote control LED
Lights when a command is sent from the remote control.
13 SOURCE
Press to turn on/off other components connected to the
receiver.
14 MASTER VOLUME +/–
Use to set the listening volume.
15 MUTE
Mutes the sound or restores the sound if it has been
muted (adjusting the volume also restores the sound).
16 RECEIVER
Switches the remote to control the receiver (used to
select the white commands above the number buttons
(A.ATT, etc.)). Also use this button to set up surround
sound.
17
Press to turn on/off the illumination of some of the
buttons.

13
VSX-LX52
56 7 8
56 7 8
A
B
C
D
E
F
3. BASIC ITEMS FOR SERVICE
3.1 CHECK POINTS AFTER SERVICING
Item to be checked regarding video Item to be checked regarding audio
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. Procedures Check points
1
2
3
4
5
6
7
8
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.
Check the analog audio playback.
(Make the analog connections with a DVD player.)
Each channel audio and operations must be normal.
Check the digital audio playback.
(Make the digital connections with a DVD player.)
Each channel audio and operations must be normal.
Check surround playback.
(Select Surround mode and check the multichannel operations
via the DSP circuit.)
Each channel audio and operations must be normal.
Check the tuner (AM and FM) operations. Audio and operations must be normal.
Check the video outputs.
(Connect with a DVD player.)
Video and operations must be normal.
Check the sound from headphone output. Sound must be normal, without noise.
Check the appearance of the product. No scratches or dirt on its appearance after receiving it for
service.
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.

14 VSX-LX52
12 3 4
A
B
C
D
E
F
12 3 4
3.2 PCB LOCATIONS
AAUDIO ASSY
HPOWER AMP ASSY
EDIGITAL MAIN
ASSY
YBIND L BACK
ASSY
UPOSI 1 ASSY
SBRIDGE 1 ASSY
WPOSI 3 ASSY
VPOSI 2 ASSY
DISP-FFC
GUARD ASSY
XBIND L FRONT
ASSY
LUNREG ASSY
JDISPLAY ASSY
CV-BRIDGE
ASSY
D
COMPONENT
ASSY
B
COMPOSITE&S
ASSY
K
PRIMARY
ASSY
R
DIODE ASSY
I
PRESTAGE
ASSY
AA
AC
BINDER ASSY
AB
BIND R BACK
ASSY
Z
BIND R FRONT
ASSY
N
REGULATOR
ASSY
O
POWER SW
ASSY
P
ENCODER
ASSY
M
XM REGULATOR
ASSY
FM/AM TUNER
UNIT
T
BRIDGE 2
ASSY
Q
HEADPHONE
ASSY
F
FRONT MIC&VIDEO
ASSY
GFRONT HDMI&USB
ASSY

15
VSX-LX52
56 7 8
56 7 8
A
B
C
D
E
F
3.3 JIGS LIST
NSP 1..COMPLEX ASSY AWK8086
2..DISPLAY ASSY AWX9359
2..POWER SWASSY AWX9366
2..ENCODER ASSY AWX9367
2..PRIMARY ASSY AWX9369
2..HEADPHONE ASSY AWX9372
2..BINDER ASSY AWX9373
NSP 1..AMP ASSY AWK8091
2..POWER AMP ASSY AWX9376
2..BIND L FRONT ASSY AWX9379
2..POSI 1 ASSY AWX9383
2..POSI 2 ASSY AWX9385
2..POSI 3 ASSY AWX9388
2..DISP-FFC GUARD ASSY AWX9539
NSP 1..VIDEO ASSY AWK8094
2.FRONT MIC&VIDEO ASSY AWX9365
2..BIND L BACK ASSY AWX9380
2..COMPONENT ASSY AWX9390
2..COMPOSITE&S ASSY AWX9392
NSP 1..AUDIO ASSY AWK8097
2..AUDIO ASSY AWX9394
NSP 1..LOCAL POWER ASSY AWK8101
2..BIND R FRONT ASSY AWX9381
2..BIND R BACK ASSY AWX9382
2..UNREG ASSY AWX9397
2..REGULATOR ASSY AWX9401
2..PRESTAGE ASSY AWX9405
2..DIODE ASSY AWX9406
2..BRIDGE 2 ASSY AWX9408
2..BRIDGE 1 ASSY AWX9409
2..V-BRIDGE ASSY AWX9495
2..XM REGULATOR ASSY AWX9543
1..FRONT HDMI&USB ASSY AWX9411
1..DIGITAL MAINASSY AWX9420
1..FM/AM TUNER UNIT AXX7248
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.
Name Jig No. Remarks
15P board to board extension jig cable GGD1484Diagnosis
17P board to board extension jig cable GGD1648Diagnosis
[1] Jigs list

16 VSX-LX52
12 3 4
A
B
C
D
E
F
12 3 4
4. BLOCK DIAGRAM
4.1 OVERALL WIRING DIAGRAM
FRONTV GNDF2 GNDU XOSDRST OSDSCK5 OSDSO5 OSDCS5 EXSO3 EXOEANLG5 EXSTANLG5 VMUTE(NC)
19
CN8601
CN8008
11
CN8502
CN8009
GNDV SC_OUT GNDV SY_OUT GNDV CV_OUT GNDV SDET GNDV SC_IN GNDV SY_IN GNDV CV_IN GNDV GNDV(P) GNDV(P) V-5R6_V V+5R6_V
CN1250
CN8001
18
CN1251
9
CN1252
19
CN1253 CN1254
18
CN8503
9
V+5R6_V GNDD CV/Y_IN GNDD COMPDET GNDD CR_OUT GNDD CB_OUT GNDD Y_OUT GNDD CR_IN GNDD CB_IN GNDD Y_IN GNDD
SDET GNDD SC_IN GNDD GNDVSG2 GNDVSG2 GNDVSG2 GNDVSG2 V-5R6_V
E2VINSW00
NECK6/6OHM XHPDET
232RX5 232TX5 232CDET GNDU(232C) GNDU(232C) GNDU XOSDRST OSDCK/EXSCK OSDSO/EXSO OSDCS EXOEANLG EXSTANLG GNDD SC_OUT GNDD SY_OUT
NECK8 RYHP WATTS RYVL 12VTRG2 X12VERR 12VTRG1 232POW E2VINSW01
GNDU V+5R6_ST XDCERR XPROTECT XOLERR RYB RYCR RYAF V+5R6_U GNDU XSMUTE IRIN
RMC SRIN NC(RYFH) SROUT GNDSR GNDSR
9
CN2201 CN7702 CN7701 CN1400
13
CN2202
CN7604 CN7603
CN482
15
CN7601
CN501
23
CN2002
CN7602
CN1401
39
POSI 1 ASSY
POSI 3 ASSY POSI 2 ASSY
232
CN1601
CN1900
4
GNDD
RFX2+
RFX2-
GNDD
RFX1+
RFX1-
GNDD
RFX0+
RFX0-
GNDD
RFXC+
RFXC-
GNDD
SCL_SINK
SDA_SINK
HOTDET5
WP5
HDSCL5
HDSDA5
V+5_F
V+5_HD
GNDD
GNDD
GNDD
V+5_DDD
V+5_DDD
V+5_DDD
V+5_DDD
V+5_DDD
CEC_IO
TUNER MODULE
RIN
VCOMGF(AD)
LIN
GNDAC(GNDA)
FRO
GNDAC(GNDA)
FLO
GNDAC(GNDA)
SRO
GNDAC(GNDA)
SLO
GNDAC(GNDA)
SWO
GNDAC(GNDA)
CO
GNDAC(GNDA)
SBRO
GNDAC(GNDA)
SBLO
GNDAC(GNDA)
ZONE2RO
GVCOMX
ZONE2LO
23
V+5R6_U
V+5R6_U
GNDA
SIRIUSR
GNDA
SIRIUSL
GNDA
TUCE
TUSCK
TUSI5
TUSO
XRDSRST5
RDSCK5
RDSSI5
GNDU(EMMA)
15
RIN
VCOMGF(AD)
LIN
GNDAC
FRO
GNDAC(VCOMGF
FLO
GNDAC(VCOMGS
SRO
GNDAC(VCOMGC
SLO
GNDAC(VCOMGC
SWO
GNDAC
CO
GNDAC
SBRO
GNDAC
SBLO
GNDAC
XMR(ZONE2 RO)
GVCOMX
XML(ZONE2 LO)
GNDA
SIRIUSR
GNDA
SIRIUSL
GNDA
TUCE
TUSCK
TUSI
TUSO
RDS RST
RDS CLK
RDS DATA
GNDU(EMMA)
V+5R6_U
V+5R6_U
LSSN
VLSCK
VLSO
Z2VLSO
Z2MUTE
AMUTE
SBMUTE
MICDET
GNDU
GNDU
V+5R6_U
V+5R6_U
Z3MUTE
13 13 13
LSSN
VLSCK
VLSO
Z2VLSO
Z2MUTE
AMUTE
SBMUTE
MICDET
GNDU(EMMA)
GNDU(EMMA)
V+5R6_U
V+5R6_U
Z3MUTE
JOGA
JOGB
GNDU
*1.00mm
AC1 AC2 VF GNDU GNDU V+5R6_ST RYAC ACWP5
JP3001
JH3003
V+5_ST
POWLED
POWERKEY
GNDU
JH3002
CN7502
CN3471
CN7501
5
CN2204
5
CN1259
CN3003
CN7504
V+5R6_ST
V+5R6_U
V+5R6_U
GNDU
GNDU
GNDU
GNDU
IRIN
SRIN
RMC
SROUT
XOLERR
EVREQO
XEMRST5
EVSI5
EVSO
EVSCK
EVREQI5
GNDU
ACWP5_TEMPERR
EMPOW
LOWPOW
XSMUTE
HOTPLUG
CECIO
XVDDERR
XDCERR
XPROTECT
EV232RX
EV232TX
232EV
232POW
232CDET
TEMPL
TEMPH
FANSTOP
WATTS
GNDU
GNDU
*1.00mm
CN3001
CEC_FRONT CEC_FRONT GNDHD GNDHD
V+5D
D-
D+
GNDUSB
GNDS
V+7_A
V-7_A
GNDA
MICIN
MICDET
CN3401
ENCORDER
ASSY
GNDU POS2 GNDU GNDU POS3
GNDU POS1
223
CN7001 CN7003 CN7002
CN8002
CN8003CN8004
CN8005
19
11
23
23 15
15
MICDET MICOUT GNDA V-7A V+7A
AXX7248-
CN1901
11
CEC_IO
CEC_IO GNDD GNDD
CN3501
18919 18
9
V+5_USB
D-
D+
GNDD
GNDS
*1.00mm
*1.00mm
*0.50mm
*0.50mm
CN1402 CN1403 CN1404
CN7751
2/75
PG02KA-F07
2/150
PG02KA-F15
3/75
PG03KA-F07
4/50
D20PYY0405E
3/50
D20PYY0305E
39/330
ADD7667-
4/50
ADD7677-
30/440
ADD7712-
ADD7669-
5/420
11/60
ADD7639
5/510
ADX7687-
*1.00mm
*1.00mm
*0.50mm
*2mm
*2mm
9
V+13_UN V+13_UN GNDD GNDD
GNDAA V+5_AD GNDU V+5R6_U V+5R6_V GNDV(SG2) GNDV(SG2) GNDV(SG2) V-5R6_V FANCTLL FANERR
2
FRONTV
GNDF
FRONTV
GNDF
2/430
ADX7688-
2
CN8017
CN3472
8
5
• NOTE FOR FUSE REPLACEMENT
CAUTION -
FOR CONTINUED PROTECTIONAGAINST RISK OF FIRE,
REPLACE WITH SAME TYPE AND RATINGS OF FUSE.
O
POWER
SW ASSY
(AWX9366)
P
ENCODER
ASSY
(AWX9367)
G
FRONT HDMI
& USB ASSY
(AWX9411)
FFRONT MIC &
VIDEO ASSY
(AWX9365)
CV-BRIDGE AS
(AWX9495)
S
BRIDGE 1 ASSY
(AWX9409)
TBRIDGE 2 ASSY
(AWX9408)
VPOSI 2 ASSY
(AWX9385)
UPOSI 1 ASSY
(AWX9383) WPOSI 3 ASSY
(AWX9388)
YBIND L BACK ASSY
(AWX9380)
XBIND L
FRONT ASSY
(AWX9379)
ZBIN
(AW
J
E
DISPLAY
ASSY
(AWX9359)
DIGITAL MAIN ASSY
(AWX9420)
E1/11- E11/11
()
D
D1/2
(
COMPOSITE & S ASSY
(AWX9392)
B
B1/2- B2/2
(
DISP-FFC
GUARD ASSY
(AWX9539)
AC
BINDER
ASSY
(AWX9373)
AB

17
VSX-LX52
56 7 8
56 7 8
A
B
C
D
E
F
!
!
AC CORD
ACWP
RYAC
V+5R6_ST
GNDU
GNDU
SUB
TRANS
!FU1
JH3701
(*;1.00mm FFC CONNECTOR)
BOARD IN
(*;1.00mm FFC)
1.25mm FFC
2.0mm FLAT CABLE
1.25mm FFC CONNECTOR(I)
1.25mm FFC CONNECTOR(L)
(*;1.00mm FFC CONNECTOR)
2.0mm CABLE
ANOTHER CONNECTOR
PH SHIELD
CN8014
CN5804CN5805
15 17
CN8013
12VTRG2 X12VERR 12VTRG1 V+5R6_U GNDU IRIN SROUT RMC SRIN GNDSR GNDSR
232RX
232TX 232CDET 232POW RYFH GNDU(232C)
GNDU GNDU V+5R6_ST XDCERR XPROTECT XOLERR WATTS RYB RYCR RYAF RYHP NECK6/6OHM RYVL NECK8 XHPDET
19
N8008
N8502
GNDV SDET GNDV SC_IN GNDV SY_IN GNDV CV_IN GNDV GNDV(P) GNDV(P) V-5R6_V V+5R6_V
503
AEK7075-
(T1.6A L/250V)
AEK7072-
(T800mA L/250V)
AEK1061-
(T5A L/250V)
2 4
CN2203
CN6603
CN5806 CN5110 CN5310 CN5610 CN5010 CN5510 CN5210
CN6310CN6110CN6902 CN6510 CN6210CN6410 CN6610
4
CN2206
JP6901
CN2003
ODULE
RIN
VCOMGF(AD)
LIN
GNDAC
FRO
GNDAC(VCOMGF)
FLO
GNDAC(VCOMGS)
SRO
GNDAC(VCOMGC)
SLO
GNDAC(VCOMGC)
SWO
GNDAC
CO
GNDAC
SBRO
GNDAC
SBLO
GNDAC
XMR(ZONE2 RO)
GVCOMX
XML(ZONE2 LO)
GNDA
SIRIUSR
GNDA
SIRIUSL
GNDA
TUCE
TUSCK
TUSI
TUSO
RDS RST
RDS CLK
RDS DATA
GNDU(EMMA)
V+5R6_U
V+5R6_U
LSSN
VLSCK
VLSO
Z2VLSO
Z2MUTE
AMUTE
SBMUTE
MICDET
GNDU(EMMA)
GNDU(EMMA)
V+5R6_U
V+5R6_U
Z3MUTE
CN2204
SECONDARY
!PRIMARY
MAINTRANST1501
HPDET
HPR
GNDHP
HPL
GNDTRG GNDTRG V+12TRG V-12_A
V+12_A
5
17
1519
MICDET MICOUT GNDA V-7A V+7A
GNDTRG V+12TRG V-12A V+12A
GNDA SRO GNDA SLO GNDA FRO GNDA
CO GNDA FLO GDNA SBRO GNDA SBLO GNDA AMUTE SBMUTE
GNDA
SR
GNDA
SL
GNDA
FR
GNDA
C
GNDA
FL
GDNA
SBR
GNDA
SBL
GNDA
AMUTE
SBMUTE
TCE TDI
TCLK
TDO GNDT TL V+9T TR VSM FMDET GNDT
48-
10
JP2205
GNDTRG V+12TRG V-12A V-12A GNDSG1 GNDSG1 GNDA V+12A V+12A V+12T
CN4102
10
FLVREGAREGXMEMMAPOWER AMP
V+12_D
V+12_D
GNDD
GNDD
EMMA_AC1
EMMA_AC2
3
AREG
AREG_G
AREG
5
AC1
AC2
VREG
VREG_G
VREG
GNDST
GNDST
V+5R6ST
AC RY
WUP
GNDTRG
V+12TRG
V-12A
V-12A
GNDSG
GNDSG
GNDSG
V+12A
V+12A
V+12T
GNDAD
V+5AD
GNDU
V+5R6U
V+5R6V
GNDV
GNDV
GNDV
V-5R6V
FANCTL
FANERR
11
CN4002 CN4052
CN4051
CN4001
CN4201
JP4203
CN5701
VH_a
VL-H_a
VL-L_a
GND
VL-L_b
VL-H_b
VH_b
7
JH5801
JP5701
HP_DET HPR GNDHP HPL
4
CN3451
VLACB VLACA VL- VL+
4
CN4701
CN5410
555
755 5
5755
5
555
4
CN6010
CN4101
AC1
AC2
-VF
GNDST
GNDST
V+5R6_ST
AC RY
WUP
751
FU5
!
!FU6
!FU7
!FU8
!FU9
ADX7682-
10/445
11/600
ADX7711-
5/360
8/175
ADX7712-
4/380
ADX7679-
4/600
D20PYY0460E
4/120
ADX7651-
ADX7714-
4/50
11/60
ADD7639-
17/70
ADD7668-
(T4A L/250V)
AEK1060-
*2mm
SBL SBL_IN2 SBL_IN1 GAMP GAMP SBR SBR_IN2 SBR_IN1 GAMP GAMP FL FL_IN2 FL_IN1 GAMP GAMP
C C_IN2 C_IN1 GAMP GAMP +VH -VH
FR FR_IN2 FR_IN1 GAMP GAMP SL SL_IN2 SL_IN1 GAMP GAMP
SR SR_IN2 SR_IN1 GAMP GAMP
CN3708
/SY,/PW
ATS7427-
XDG3061-
S3
S4
S5
S2
P1P1P1P2
JA3702
17
8
*2mm
ADD7721-
(*;0.50mm FFC CONNECTOR)
SBL SBLIN2 SBLIN1 GAMP GAMP SBR SBRIN2 SBRIN1 GAMP GAMP L LIN2 LIN1 GAMP GAMP
C CIN2 CIN1 GAMP GAMP +VH -VH
R
RIN2 RIN1 GAMP GAMP SL SLIN2 SLIN1 GAMP GAMP
SR SRIN2 SRIN1 GAMP GAMP
GNDTRG V+12_TRG V-12A V+12A
(*;0.50mm FFC CONNECTOR)
5
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. Therefore, when replacing, be sure to use parts of identical
designation.
: The power supply is shown with the marked box.
V-BRIDGE ASSY
(AWX9495)
DGE 2 ASSY
X9408)
IPRESTAGE ASSY
(AWX9405)
LUNREG ASSY
(AWX9397)
ASSY ZBIND R FRONT ASSY
(AWX9381)
BIND R
BACK ASSY
(AWX9382)
KPRIMARY ASSY
(AWX9369)
Q
HEAED PHONE
ASSY
(AWX9372)
RDIODE ASSY
(AWX9406)
A
AUDIO ASSY
(AWX9394)
N
REGULATOR
ASSY
(AWX9401)
M
XM
REGULATOR
ASSY
(AWX9543)
DCOMPONENT ASSY
(AWX9390)
POWER AMP ASSY (AWX9376)
D1/2- D2/2
()
H
H1/2- H2/2
()
SITE & S ASSY
392)
B1/2- B2/2 )
AA

18 VSX-LX52
12 3 4
A
B
C
D
E
F
12 3 4
4.2 BLOCK DIAGRAM FOR DIGITAL AUDIO BLOCK
Optical in(3)
JA104
Optical out
JA106
Block Diagram (Digital Audio part)
I2S MCLK
I2S BCLK, LRCLK
I2S DATA (uncompressed)
I2S DATA (compressed(Include dts HD High Resolution Audio, dts HD LBR, Dolby Digital Plus) or 2ch(under 48kHz for HDMI))
I2S or DSD DATA (Signal from HDMI (dts HD Master Audio) (Dolby TrueHD) (SACD) (LPCM Multi)(for over 88.2 kHz of PCM or LPCM))
S/PDIF, Operation Clock,etc
Analog Audio Signal Buffer IC1251 7PAU04
Control/Memory Bus Line
X'tal for USB
X1250
Analog in(L/R) 48.0MHz
ASS7099-
USB/iPod
Audio
R202, R204, R206, R208
Coaxial in(2)
Buffer
IC215
7SH08
USB/iPod
Audio
Zone2
USB
R466, R468R466, R468
R462, R464,R462, R464,
Analog
out(L/R)
SW
IC363
7WH126(1/2)
SW
IC363
7WH126(2/2)
IC301
Channel Assigment Difference
Pin No. SACD Signal OTHER Signal
85 Data(C) N/A
86 Data(LFE) N/A
97 Data(FL) Data(FL,FR)
98Data(FR) Data(SL,SR)
99 Data(SL) Data(C,LFE)
Data(SR) Data(SBL,SBR)
Control IN/OUT
Control IN/OUT
HDMI S/PDIF in(1)
100
GATE ARRAY
IC1300
PE7008A
MAINLSI
IC800
EMMA
UPD61283F1-407LU2A
From HDMI Block
DIR/DIT
IC101
HDMI
AUDIO SW
IC1566
VHC541
SW
IC221
74VHC157
SW
IC231
74VHC157
ADC
IC501
AK5358AET
DACDAC
IC521IC521
AK4388ETAK4388ET IC452
74LCX541
SW
IC241
74VHC125
Buffer
IC1563
7WH157
M24
E18
C19, D20
E21
141,142
140
JA101
JA103
JA105
CN501
#3, #1
CN501
#23, #21
1, 144
2
N1
AK4118

19
VSX-LX52
56 7 8
56 7 8
A
B
C
D
E
F
ZERO
DELAY
BUFFER
IC453
IDT6V60008
SW
IC461
74VHC157
ASS7091-
ASS7090-
z for HDMI))
z of PCM or LPCM))
Buffer
IC1081 X'tal
7SH08X362
24.576MHz
X'tal
X361
22.5792MHz
(Front L/R only)
R466, R468
R462, R464,
SW
IC363
Analog out(7.1ch)
7WH126(1/2)
SWBuffer
IC363 IC364
7WH126(2/2) 7SZ08
R Signal
L,FR)
L,SR)
,LFE)
BL,SBR)
trol IN/OUT
AINLSI
IC800
EMMA
83F1-407LU2A
DSP
IC301
DSPA56720AG
To HDMI Block
(Basic Audio)
Clock Buffer
IC361
74VHC04
7
7
SW
IC9002
74VHC157
DAC
IC521
AK4388ET
2ch DAC
IC602,652,
702,752
WM8728×4
DAC Buffer
IC452IC452
74LCX54174LCX541
M24
HCKT
SCKR, FSR
SDI0_1
SDI1_1 to SDI3_1,
SDI0 to SDI1
HCKT_3
SCKT_3, FST_3, SCKT, FST
SDO2_2 to SDO5_2
EXTAL
CN501
#5,7,9,11,13,15,17,19
Flash ROM
IC261
AYW7305
SDRAM
IC251
64Mbit
(4bank*1M*16bit)

20 VSX-LX52
12 3 4
A
B
C
D
E
F
12 3 4
4.3 BLOCK DIAGRAM FOR ANALOG AUDIO BLOCK
MIC
AUDIO1 AUDIO2
AV1 AV2 AV3
TUNER Module
MULTI INL/R
MULTI INSL/SR
MULTI INC/SW
AUDIO REC
AVREC
ZONE2 OUT
Selector / Volume / PRE Amp IC2501 BD3473KS2
SP L/R
SP C
SP SL/SR
SP SBL/SBR
HP
SWPRE Amp IC2821 NJM4565MD
<<POWER AMP>>
PREOUT SW
AV4
ZONE3 OUT
ZONE2,3 E-VOL IC2001 BD3814FV
PREOUT L/R
PREOUT SL/SR
PREOUT SBL/SBR
PREOUT C
Audio Block Diagram
DIGITAL AUDIO BLOCK
AE