Pioneer VSX-91-TXH Service manual

PHASE

STANDBY/ON

CONTROL

TV/SAT DVR/VCR 1 DVR/VCR 2 VIDEO/GAME

SYSTEM

TUNING/

SETUP

STATION

MULTI JOG

TUNER
EDIT

DIGITAL PRECISION PROCESSING

SPEAKERSRETURN TONE

CD-R/TAPE/MD

FM/AM

CD

S-VIDEO

VIDEO/GAME INPUT

USB

DIGITAL INAUDIO RLVIDEO

LISTENING

PTY

EON

DVD/LD

MODE

SEARCH

MODE

ENTER

MULTI JOG

PHONES

VSX-LX50

MULTI CH

SIGNAL

SB ch

HIMDUBS iPod

SELECT

PROCESSING

IN

MASTER
VOLUME

MCACC

SETUP MIC

VSX-LX50

AUDIO/VIDEO MULTI-CHANNEL RECEIVER

VSX-LX50

VSX-91TXH
VSX-9120TXH-K

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

ORDER NO.

RRV3598

Model Type Power Requirement Remarks

VSX-LX50 HYXJ5 AC 220 V to 230V

VSX-91TXH KUXJ/CA AC 120 V

VSX-9120TXH-K KUXJ AC 120 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 2007

T-FZV MAY 2007 printed in Japan

1234

SAFETY INFORMATION

A

This service manual is intended for qualified service technicians ; it is not meant for the casual do-it­yourselfer. 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
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

B

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
de remplacement doivent avoir la même désignation.

type rapide) et/ou (fusible de type lent) sur CCI indiquent que les pièces

C

(FOR USA MODEL ONLY)

1. SAFETY PRECAUTIONS

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

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.

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

D

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.

Reading should

Leakage

Device
under

E

test

Te s t all
exposed metal
surfaces

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

current
tester

not be above

0.5 mA

Earth

ground

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 saf
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
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 subscr iption to, or additional copies of,
PIONEER Service Manual may be obtained at a nominal
charge from PIONEER.

ety

the

AC Leakage Test

F

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VSX-LX50

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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.

 Use specified parts for repair.

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

 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.

 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)

 Make sure the screws are tightly fastened.

Please be sure that all screw

 Make sure each connectors are correctly inserted.

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

 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.

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

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

 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.

 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.

 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.

s are fastened, and that there are no loose screws.

A

B

C

D

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

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
installed before shipment. Please be sure to follow this method especially if it is specified in this manual.

56

VSX-LX50

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8

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CONTENTS

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

1. SERVICE PRECAUTIONS............................................................................................................................... 6

A

B

C

D

E

F

1.1 NOTES ON SOLDERING .......................................................................................................................... 6

2. SPECIFICATIONS............................................................................................................................................ 7

2.1 ACCESSORIES ......................................................................................................................................... 7

2.2 SPECIFICATIONS ..................................................................................................................................... 8

2.3 PANEL FACILITIES.................................................................................................................................. 10

3. BASIC ITEMS FOR SERVICE........................................................................................................................ 20

3.1 CHECK POINTS AFTER SERVICING..................................................................................................... 20

3.2 PCB LOCATIONS .................................................................................................................................... 21

3.3 JIGS LIST ................................................................................................................................................ 23

4. BLOCK DIAGRAM.......................................................................................................................................... 24

4.1 OVERALL WIRING DIAGRAM ................................................................................................................ 24

4.2 BLOCK DIAGRAM for AUDIO BLOCK .................................................................................................... 26

4.3 BLOCK DIAGRAM for VIDEO BLOCK..................................................................................................... 28

5. DIAGNOSIS.................................................................................................................................................... 30

5.1 DIAGNOSIS FLOWCHART ..................................................................................................................... 30

5.2 CIRCUIT DESCRIPTION......................................................................................................................... 70

6. SERVICE MODE ............................................................................................................................................ 72

6.1 TEST MODE............................................................................................................................................ 72

7. DISASSEMBLY .............................................................................................................................................. 75

8. EACH SETTING AND ADJUSTMENT ........................................................................................................... 82

8.1 ADJUSTMENT......................................................................................................................................... 82

8.2 HOW TO UPDATE FIRMWARE............................................................................................................... 82

9. EXPLODED VIEWS AND PARTS LIST.......................................................................................................... 88

9.1 PACKING ................................................................................................................................................. 88

9.2 EXTERIOR SECTION.............................................................................................................................. 90

9.3 CHASSIS SECTION ................................................................................................................................ 92

9.4 REAR SECTION ...................................................................................................................................... 94

9.5 POWER AMP SECTION.......................................................................................................................... 98

9.6 FRONT PANEL SECTION ..................................................................................................................... 100

10. SCHEMATIC DIAGRAM............................................................................................................................. 102

10.1 AUDIO IN ASSY (1/2).......................................................................................................................... 102

10.2 AUDIO IN (2/2) and 12V-REG ASSYS................................................................................................. 104

10.3 MAIN CONTROL ASSY (1/3)............................................................................................................... 106

10.4 MAIN CONTROL (2/3), GUARD-C and GUARD-F ASSYS ................................................................. 108

10.5 MAIN CONTROL ASSY (3/3)................................................................................................................110

10.6 DSP ASSY (1/4)....................................................................................................................................112

10.7 DSP ASSY (2/4)....................................................................................................................................114

10.8 DSP ASSY (3/4)....................................................................................................................................116

10.9 DSP ASSY (4/4)....................................................................................................................................118

10.10 COMPOSITE ASSY........................................................................................................................... 120

10.11 S-VIDEO and BRIDGE 2 ASSYS....................................................................................................... 122

10.12 COMPONENT ASSY......................................................................................................................... 124

10.13 DISPLAY, VOLUME and MULTI JOG ASSYS.................................................................................... 126

10.14 HEADPHONE, FRONT-IN, PRIMARY and TRANS 1 ASSYS........................................................... 128

10.15 TRANS 2-1, DIODE 1, VH TR, BRIDGE 1 and PS/SP ASSYS ......................................................... 130

10.16 TRANS 2-2, TRANS SIDE, LOCAL P-SUPPLY, DC/DC, IR I/O and VIDEO CONNECT ASSYS ..... 132

10.17 POWER AMP-L, POSI 1-L and POSI 2-L ASSYS............................................................................. 134

10.18 POWER AMP-R and POSI 1-R ASSYS............................................................................................. 136

10.19 POWER AMP IN and POWER PROTECT ASSYS ........................................................................... 138

10.20 HDMI & DVC ASSY (1/2)................................................................................................................... 140

10.21 HDMI & DVC ASSY (2/2)................................................................................................................... 142

10.22 USB ASSY (VSX-LX50 ONLY) .......................................................................................................... 144

11. PCB CONNECTION DIAGRAM.................................................................................................................. 147

11.1 AUDIO IN ASSY................................................................................................................................... 148

11.2 12V-REG ASSY.................................................................................................................................... 152

11.3 BRIDGE 2 ASSY.................................................................................................................................. 153

11.4 MAIN CONTROL ASSY ....................................................................................................................... 154

11.5 DSP ASSY ........................................................................................................................................... 158

11.6 COMPOSITE ASSY ............................................................................................................................. 162

11.7 S-VIDEO ASSY.................................................................................................................................... 166

11.8 COMPONENT ASSY ........................................................................................................................... 170

11.9 DISPLAY ASSY.................................................................................................................................... 174

11.10 VOLUME ASSY.................................................................................................................................. 178

4

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VSX-LX50

5678

11.11 HEADPHONE ASSY...........................................................................................................................179

11.12 MULTI JOG ASSY ..............................................................................................................................180

11.13 FRONT-IN ASSY ................................................................................................................................184

11.14 PRIMARY ASSY.................................................................................................................................188

11.15 TRANS 1 ASSY ..................................................................................................................................192

11.16 TRANS 2-1 ASSY...............................................................................................................................193

11.17 DIODE 1 and VH TR ASSYS..............................................................................................................194

11.18 BRIDGE 1 ASSY.................................................................................................................................195

11.19 PS/SP ASSY.......................................................................................................................................196

11.20 TRANS 2-2 ASSY...............................................................................................................................200

11.21 POSI 1-L, POSI 2-L and POSI 1-R ASSYS........................................................................................201

11.22 TRANS SIDE ASSY............................................................................................................................202

11.23 IR I/O ASSY........................................................................................................................................204

11.24 LOCAL P-SUPPLY ASSY ...................................................................................................................206

11.25 DC/DC ASSY ......................................................................................................................................208

11.26 VIDEO CONNECT ASSY ...................................................................................................................210

11.27 POWER AMP-L ASSY........................................................................................................................212

11.28 POWER AMP-R ASSY .......................................................................................................................216

11.29 POWER AMP IN ASSY ......................................................................................................................220

11.30 POWER PROTECT ASSY..................................................................................................................222

11.31 HDMI & DVC ASSY ............................................................................................................................224

11.32 USB ASSY (VSX-LX50 ONLY) ...........................................................................................................228

12. PCB PARTS LIST........................................................................................................................................230

A

B

C

D

E

VSX-LX50

56

F

5

7

8

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1. SERVICE PRECAUTIONS

1.1 NOTES ON SOLDERING

A

• 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 re

working 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

B

temperatures (hard to melt/easy

to harden).

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

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

C

D

E

F

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VSX-LX50

5678

2. SPECIFICATIONS

2.1 ACCESSORIES

Accessories

AM Loop Antenna
(ATB7013)

SOURCE

SYSTEM OFF

INPUT

RECEIVER

SELECT

TV CTRL

DVR 2USB

TV DVR 1

DVD

FM Wire Antenna
(ADH7030)

ATT

DISC

MIDNIGHT/

ANALOG

LOUDNESS

RECEIVER

CDHDMI 2

DIMMER

S.RETRIEVER

TUNER

HDMI 1

SR+

DIALOG E

SLEEP

iPod

CD-R/TAPE

RETURN

T.EDIT

MENU

CH LEVELAV PARAMETER

ENTER

CLASS

D.ACCESS

BAND

STST

TV CH

ENTER

TUNE

TUNE

TV CONTROL

+10

TOP MENU

INPUT

PTY SEARCH

SETUP

GUIDE

DVD

VOL

MUTE

HDD

REC STOP JUKEBOX

REC

EON

SELECT

SUBTITLE

B CDE

A

MPX

AUDIO

TV VOL

Remote Control Unit

(AXD7491: VSX-LX50)
(AXD7490: VSX-91TXH)
(AXD7497: VSX-9120TXH-K)

A

AA/LR6 Dry Cell Batteries
(VEM1031)

Setup Microphone

(for Auto MCACC setup)

(APM7008)

IN

S.DIRECT

STEREO/

F.S.SURR

ADV.SURR

SB ch

CH CH

MCACC

STANDARD

PHOTO

THX

RECEIVER

PHASE

SIGNAL SEL

DISP

SHIFT

STATUS

MULTI OPE

Audio Control Cable for iPod
(XDE7025)

KU models only

B

C

Windows Media™ and the Windows logo are trademarks or
registered trademarks of Microsoft Corporation in the
United States and/or other countries.

THX and the THX logo is a trademark of THX Ltd. which
may be registered in some jurisdictions. All rights reserved.

Manufactured under license from Dolby Laboratories.
"Dolby", "Pro Logic", "Surround EX", and the double-D
symbol are trademarks of Dolby Laboratories.

"DTS" is a registered trademark of DTS, Inc. and
"DTS-HD Master Audio" is a trademark of DTS, Inc.

D

E

VSX-LX50

56

F

7

7

8

1234

2.2 SPECIFICATIONS

VSX-LX50

A

Amplifier section

Continuous Power Output (Stereo)

Front .........150 W + 150 W (DIN 1 kHz, THD 1 %, 6 Ω)

120 W + 120 W (DIN 1 kHz, THD 1 %, 8 Ω)

Continuous Power Output (Multichannel)

Front .........150 W + 150 W (DIN 1 kHz, THD 1 %, 6 Ω)

120 W + 120 W (DIN 1 kHz, THD 1 %, 8 Ω)

Center..................... 150 W (DIN 1 kHz, THD 1 %, 6 Ω)

120 W (DIN 1 kHz, THD 1 %, 8 Ω)

Surround...150 W + 150 W (DIN 1 kHz, THD 1 %, 6 Ω)

B

Surround back

.................150 W + 150 W (DIN 1 kHz, THD 1 %, 6 Ω)

Rated Power Output................................ 130 W + 130 W

Rated Power Output................................ 110 W + 110 W

• The above specifications are applicable when the
power supply is 230V.

Audio Section

Input (Sensitivity/Impedance)

C

LINE........................................................... 335 mV/47 kΩ

Frequency Response(LINE).....5 Hz to 100 000 Hz dB

Output (Level/Impedance)

REC.................................................... 335 mV/2.2 kΩ

Tone Control

BASS................................................. ± 6 dB (100 Hz)

TREBLE ............................................ ± 6 dB (10 kHz)

LOUDNESS............... +4 dB / +2 dB (100 Hz/10 kHz)

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

LINE.................................................................103 dB

Signal-to-Noise Ratio

D

[DIN (continuous rated power output/50 mW)]

LINE...................................................... 92 dB / 65 dB

Composite Video / S-Video Section

Input (Sensitivity/Impedance) ........................1 Vp-p/75 Ω

Output (Level/Impedance).............................1 Vp-p/75 Ω

Signal-to-Noise Ratio...............................................65 dB

Frequency Response .............................. 5 Hz to 10 MHz

120 W + 120 W (DIN 1 kHz, THD 1 %, 8 Ω)

120 W + 120 W (DIN 1 kHz, THD 1 %, 8 Ω)

(20 Hz to 20 kHz, 0.09 %, 6 Ω)

(20 Hz to 20 kHz, 0.09 %, 8 Ω)

(at volume position –40 dB)

FM Tuner Section

Frequency Range.......................... 87.5 MHz to 108 MHz

Usable Sensitivity ...... Mono: 15.2 dBf, IHF (1.6 µV/75 Ω)

50 dB Quieting Sensitivity ........................Mono: 20.2 dBf

Stereo: 41.2 dBf

Sensitivity (DIN)....................... Mono: 1.1 µV (S/N 26 dB)

Stereo: 50 µV (S/N 46 dB)

Signal-to-Noise Ratio..................Mono: 76 dB (at 85 dBf)

Stereo: 72 dB (at 85 dBf)

Signal-to-Noise Ratio (DIN)..........................Mono: 62 dB

Stereo: 58 dB

Distortion ........................................Stereo: 0.6 % (1 kHz)

Alternate Channel Selectivity ................. 70 dB (400 kHz)

Stereo Separation....................................... 40 dB (1 kHz)

Frequency Response ..................30 Hz to 15 kHz ± 1 dB

Antenna Input ........................................75 Ω unbalanced

AM Tuner Section

Frequency Range....... 531 kHz to 1602 kHz (9 kHz step)

Sensitivity (IHF, Loop antenna) .........................350 µV/m

Selectivity ................................................................30 dB

Signal-to-Noise Ratio...............................................50 dB

Antenna ...................................................... Loop antenna

Miscellaneous

Power Requirements...AC 220 V to 230 V, 50 Hz / 60 Hz

Power Consumption ...............................................450 W

In standby................................................................0.6 W

Dimensions......420 (W) mm x 173 (H) mm x 465 (D) mm

Weight (without package)..................................... 15.3 kg

Furnished Parts

Setup microphone (for Auto MCACC setup) ..................1

AA/IEC R6P dry cell batteries ....................................... 2

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

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

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

Warranty card................................................................. 1

Operating instructions

Note

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

Component Video Section

Input (Sensitivity/Impedance) ........................1 Vp-p/75 Ω

E

Output (Level/Impedance).............................1 Vp-p/75 Ω

Signal-to-Noise Ratio...............................................65 dB

Frequency Response ............................ 5 Hz to 100 MHz

F

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5678

VSX-91TXH/VSX-9120TXH-K

Amplifier section

Continuous average power output of 110 watts* per
channel, min., at 8 ohms, from 20 Hz to 20 000 Hz with no
more than 0.09 %** total harmonic distortion (front).

Continuous Power Output

(20 Hz to 20 kHz, 8 Ω, 0.09 %)

Front ........................................................ 110 W + 110 W

Center.....................................................................110 W

Surround.................................................. 110 W + 110 W

Surround back ......................................... 110 W + 110 W

Continuous Power Output (1 kHz, 6 Ω, 1.0 %)

Front ........................................................ 150 W + 150 W

Center.....................................................................150 W

Surround.................................................. 150 W + 150 W

Surround back ......................................... 150 W + 150 W

Total harmonic distortion .......................................0.09 %

(20 Hz to 20 kHz, 110 W, 8 Ω)

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

Audio Section

Input (Sensitivity/Impedance)

LINE........................................................... 335 mV/47 kΩ

Frequency Response (LINE)....5 Hz to 100 000 Hz dB

Output (Level/Impedance)

REC.................................................... 335 mV/2.2 kΩ

Tone Control

BASS................................................. ± 6 dB (100 Hz)

TREBLE ............................................± 6 dB (10 kHz)

LOUDNESS............... +4 dB / +2 dB (100 Hz/10 kHz)

(at volume position –40 dB)

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

LINE.................................................................103 dB

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

LINE...................................................................83 dB

Composite Video / S-Video Section

Input (Sensitivity/Impedance) ........................1 Vp-p/75 Ω

Output (Level/Impedance) .............................1 Vp-p/75 Ω

Signal-to-Noise Ratio...............................................65 dB

Frequency Response .............................. 5 Hz to 10 MHz

FM Tuner Section

Frequency Range.......................... 87.5 MHz to 108 MHz

Usable Sensitivity ...... Mono: 13.2 dBf, IHF (1.3 µV/75 Ω)

50 dB Quieting Sensitivity.........................Mono: 20.2 dBf

Stereo: 38.6 dBf

Signal-to-Noise Ratio..................Mono: 73 dB (at 85 dBf)

Stereo: 70 dB (at 85 dBf)

Distortion ........................................Stereo: 0.5 % (1 kHz)

Alternate Channel Selectivity ................. 60 dB (400 kHz)

Stereo Separation ...................................... 40 dB (1 kHz)

Frequency Response ..................30 Hz to 15 kHz ± 1 dB

Antenna Input ........................................75 Ω unbalanced

AM Tuner Section

Frequency Range............................530 kHz to 1700 kHz

Sensitivity (IHF, Loop antenna) .........................350 µV/m

Selectivity ................................................................25 dB

Signal-to-Noise Ratio...............................................50 dB

Antenna ...................................................... Loop antenna

Miscellaneous

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

Power Consumption .................................490 W, 650 VA

In standby..............................................................0.65 W

AC Outlet.....................................(switched) 100 W MAX.

Dimensions......420 (W) mm x 173 (H) mm x 465 (D) mm

9

(16

/16 (W) in. x 6 13/16 (H) in. x 18 5/16 (D) in.)

Weight (without package).............. 15.3 kg (33 lbs 12 oz)

Furnished Parts

Setup microphone (for Auto MCACC setup) .................. 1

AA/IEC R6P dry cell batteries...................................... 2

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

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

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

Warranty card................................................................. 1

Operating instructions

(*) Audio Control cable for iPod...................................... 1

Note

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

(*) KU models only

A

B

C

D

Component Video Section

Input (Sensitivity/Impedance) ........................1 Vp-p/75 Ω

Output (Level/Impedance) .............................1 Vp-p/75 Ω

Signal-to-Noise Ratio...............................................65 dB

Frequency Response ............................ 5 Hz to 100 MHz

56

VSX-LX50

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2.3 PANEL FACILITIES

Front Panel (VSX-LX50)

A

1 72 65 128

910 11

VSX-LX50

ENTER

PHASE

CONTROL

DVD/LD

TV/SAT DVR/VCR 1 DVR/VCR 2 VIDEO/GAME

PHONES

SYSTEM

SETUP

MULTI JOG

TUNING/
STATION

DIGITAL PRECISION PROCESSING

TUNER

SPEAKERSRETURN TONE

EDIT

SIGNAL

MULTI CH

CD-R/TA PE /MD

CD

S-VIDEO

FM/AM

VIDEO/GAME INPUT

DIGITAL INAUDIO RLVIDEO

161514 1713

HIMDUBS iPod

USB

MCACC

SETUP MIC

18

SELECT

SB ch

PROCESSING

IN

MASTER
VOLUME

STANDBY/ON

LISTENING

PTY

EON

MODE

SEARCH

MODE

MULTI JOG

B

21 222019 234324

SYSTEM

SETUP

MULTI JOG

C

1

MULTI JOG

dial

Use the MULTI JOG dial to select various settings and
menu options.

2

 STANDBY/ON

Switches the receiver between on and standby. Power
indicator lights when the receiver is on.

3

EON MODE

Use to search for programs that are broadcasting
traffic or news information.

PTY SEARCH

D

Use this button to search for RDS program types.

4 LISTENING MODE

Use with the MULTI JOG dial to select the various
listening modes.

5

PHASE CONTROL

indicator

Lights when the Phase Control is switched on.

6MCACC indicator

Lights when one of the MCACC presets is selected.

7

DIGITAL PRECISION PROCESSING

Lights to indicate digital processing.

E

8 Character display

See Display on.

9 Remote sensor

Receives the signals from the remote control.

10 HDMI indicator

Blinks when connecting an HDMI-equipped component;

TONE

TUNING/
STATION

TUNER

SPEAKERSRETURN

EDIT

indicator

12

MASTER VOLUME

13

ENTER

14

PHONES

jack

dial

Use to connect headphones. When the headphones are
connected, there is no sound output from the speakers.

15 Input source buttons

Press to select an input source.

16

VIDEO/GAME INPUT

17

USB

interface

Connect a USB audio device for playback.

18 MCACC SETUP MIC jack

Use to connect the supplied microphone.

19

SYSTEM SETUP

Press to access the System Setup menu.

20

RETURN

Press to confirm and exit the current menu screen.

21

TONE

Press this button to access the bass and treble controls,
which you can then adjust with the MULTI JOG dial.

22

TUNING/STATION

Use to find radio frequencies and to select preset stations.

23

TUNER EDIT

Use with the MULTI JOG dial to memorize and name
stations for recall.

24

SPEAKERS

Use to change the speaker system.

lights when the component is connected.

11 SIGNAL SELECT

Use to select an input signal.
SB ch PROCESSING – Selects the surround back

channel mode or virtual surround back mode.

F

MULTI CH IN – Press to select the multichannel
analog inputs.

10

VSX-LX50

1 234

5678

Front Panel (VSX-91TXH/VSX-9120TXH-K)

1 72 65 8

MULTI ZONE

ON/OFF

MULTI JOG

CONTROL

STANDBY/ON

LISTENING

MODE

43

PHASE

CONTROL

CD-R/TA PE /MD

S-VIDEO

FM/AM

VIDEO/GAME INPUT

1514 1613

12

ENTER

DVD/LD

TV/SAT DVR 1/DVR 2 VIDEO/GAMECD

PHONES

SYSTEM

SETUP

MULTI JOG

TUNING/
STATION

TUNER

SPEAKERSRETURN TONE

EDIT

17 20 211918 22

SYSTEM

SETUP

MULTI JOG

1

MULTI JOG

dial

Use the MULTI JOG dial to select various settings and
menu options.

2

 STANDBY/ON

Switches the receiver between on and standby. Power
indicator lights when the receiver is on.

3MULTI ZONE controls

If you’ve made MULTI-ZONE connections use these
controls to control the sub zone from the main zone.

4 LISTENING MODE

Use with the MULTI JOG dial to select the various
listening modes.

5

PHASE CONTROL

indicator

Lights when Phase Control is switched on.

6MCACC indicator

Lights when one of the MCACC presets is selected.

7Character display
8 Remote sensor

Receives the signals from the remote control.

9HDMI indicator

Blinks when connecting an HDMI-equipped component;
lights when the component is connected.

10SIGNAL SELECT

Use to select an input signal.

SB ch PROCESSING – Selects the surround back

TUNING/
STATION

TUNER

EDIT

SPEAKERSRETURN TONE

11

MASTER VOLUME

ENTER

12

13

PHONES

Use to connect headphones. When the headphones are
connected, there is no sound output from the speakers.

14 Input source buttons

Press to select an input source.

15

VIDEO/GAME INPUT

16

MCACC SETUP MIC

Use to connect the supplied microphone.

17

SYSTEM SETUP

Press to access the System Setup menu.

18

RETURN

Press to confirm and exit the current menu screen.

19

TONE

Press this button to access the bass and treble controls,

which you can then adjust with the MULTI JOG dial.

20

TUNING/STATION

Use to find radio frequencies and to select preset stations.

21

TUNER EDIT

Use with the MULTI JOG dial to memorize and name
stations for recall.

22

SPEAKERS

Use to change the speaker system.
channel mode or virtual surround back mode.
MULTI CH IN – Press to select the multichannel

analog inputs.

910 11

iPod

SIRIUS HDMIXM

DIGITAL INAUDIO RLVIDEO

MCACC

SETUP MIC

SIGNAL
SELECT

dial

jack

jack

VSX-91TXH

MULTI CH

SB ch

IN

PROCESSING

MASTER
VOLUME

(VSX-91TXH)

A

B

C

D

E

VSX-LX50

56

F

11

7

8

1234

(

e

)

2

OUT

HDMI

CENTER

Rear Panel (VSX-LX50)

A

B

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.

1HDMI connectors (x3)

Two inputs and one output for high-quality audio/video
connection to compatible HDMI devices.

C

2Coaxial 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 Control input/output

Use to connect other Pioneer components so that you
can control all your equipment from a single IR remote

D

sensor.

5 Stereo analog audio source inputs/(outputs) (x3)

Use for connection to audio sources such as CD players,
tape decks, turntables, etc.

9

IN IN INOUT OUT

DVR/VCR1DVR/VCR

PRE

Singl

6 Component video connections (x4)

Use the inputs to connect any video source that has
component video output, such as a DVD recorder. Use
the output for connection to a monitor or TV.

7Audio/video source inputs/(outputs) (x6)

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.

8iPod input terminal

Use to connect your Apple iPod as an audio source.

9 AM and FM antenna terminals

Use to connect indoor or outdoor antennas for radio
broadcasts.

10 Multichannel pre-amplifier outputs

Use to connect separate amplifiers for front, center,
surround, surround back and subwoofer channels.

11 Composite and S-video monitor outputs

Use to connect monitors and TVs.

12 Multichannel analog audio inputs

7.1 channel inputs for connection to a DVD player with
multichannel analog outputs.

13 Speaker terminals

Use for connection to the main front, center, surround
and surround back speakers.

Note

1 If the video signal does not appear on your TV or plasma display, try adjusting the resolution settings on your component or display. Note that some
components (such as video game units) have resolutions that may not be converted. In this case, use an (analog) S-video or composite connection.

E

F

12

1 234

VSX-LX50

5678

S

T

C

SURROUND

SURROU

CK

CENTER

X

DVR/VCR1

DVR/VCR2

Rear Panel (VSX-91TXH/VSX-9120TXH-K)

TLET

20

SWITCHED 100 W(0.8 A) MA

A

IN IN INOUT OUT

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.

1HDMI connectors (x3)

Two inputs and one output for high-quality audio/video
connection to compatible HDMI devices.

2 XM Radio input

3 Coaxial digital audio inputs (x2)

Use for digital audio sources, including DVD players/
recorders, digital satellite receivers, CD players, etc.

4 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.

5 Control input/output

Use to connect other Pioneer components so that you
can control all your equipment from a single IR remote
sensor.

6 Stereo analog audio source inputs/(outputs) (x3)

Use for connection to audio sources such as CD players,
tape decks, turntables, etc.

7Remote input (MULTI-ZONE and source)

Use for connection to an external remote control sensor
for use in a MULTI-ZONE setup, for example.

8 Component video connections (x4)

Use the inputs to connect any video source that has
component video output, such as a DVD recorder. Use
the output for connection to a monitor or TV.

PEAKER

FRON

ENTER

ND BA

9 RS-232C connector

Use for connection to a PC for graphical output when
using Advanced MCACC.

10 iPod input terminal

Use to connect your Apple iPod as an audio source.

11 Audio/video source inputs/(outputs) (x6)

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.

12AM and FM antenna terminals

Use to connect indoor or outdoor antennas for radio
broadcasts.

13 Multichannel pre-amplifier outputs

Use to connect separate amplifiers for front, center,
surround, surround back and subwoofer channels.

14 Composite and S-video monitor outputs

Use to connect monitors and TVs.

15 Multichannel analog audio inputs

7.1 channel inputs for connection to a DVD player with
multichannel analog outputs.

16 12 V trigger jack

(total 50 mA max.)
Use to switch components in your system on and off
according to the input function of the receiver.

17 MULTI-ZONE and source outputs

Use to connect a second amplifier in a separate zone.

18 SIRIUS Radio input

19 Speaker terminals

Use for connection to the main front, center, surround
and surround back speakers.

20 Switched AC power outlet

(100 W/0.8 A max.)
Use to power another component in the system. Power to
the outlet switches on and off with the receiver.

B

C

D

E

Note

1 If the video signal does not appear on your TV or plasma display, try adjusting the resolution settings on your component or display. Note that some
components (such as video game units) have resolutions that may not be converted. In this case, use an (analog) S-video or composite connection.

F

VSX-LX50

56

7

8

13

1234

Display (VSX-LX50)

A

AUTO

PCM

HDMI

DIGITAL

ANALOG

STREAM DIRECT

PRO LOGIC

ADV .SURROUND

THX

STEREO

AB

SP

1

SIGNAL

B

Light to indicate the currently selected input signal.

indicators

213 765910 11 12

LCR

SL S SR

SBLSB

LFE

Neo: 6

STANDARD

SLEEP

15

DIGITAL

DTS WMA9 Pro

SBR

DSD

AUTO lights when the receiver is set to select the input

signal automatically.

2Program format indicators

These change according to which channels are active in
digital sources.

L – Left front channel
C – Center channel
R – Right front channel
SL – Left surround channel
S – Surround channel (mono)
SR – Right surround channel
SBL – Left surround back channel

C

SB – Surround back channel (mono)
SBR – Right surround back channel
LFE

– Low frequency effects channel (the ((( ))) indicators light when

an LFE signal is being input)

3 Digital format indicators

Light when a signal encoded in the corresponding f ormat
is detected (DSDPCM lights during the DSD (Direct
Stream Digital) to PCM conversion with SACDs).

4

S.RTRV

Lights when the Sound Retriever is switched on.

5

SOUND

Lights when any of the Midnight, Loudness or tone

D

controls feature is selected.

6

PHASE CONTROL

Lights when the Phase Control is switched on.

7Sound processing indicators

Light according to the active AV parameter(s).
OVER lights to indicate that the level of an analog source

is too high. ATT lights when you use the attenuator

(ANALOG ATT) to reduce it.

8

V.SB

Lights during Virtual surround back processing.

9

TUNER

indicators

E

TUNED – Lights when a broadcast is being received.
STEREO – Lights when a stereo FM broadcast is

48

HD

PCM

S.RTRV

PHA

SOUND

CONTROL

SE

DIALOG E

Hi-Bit/Sampling

DNR

ATT

OVER

V.S B

HDMI

181413 16 1917

TUNED

STEREO

MONO

[ 1 ]

RDS
EON

[ 2 ]

MONO – Lights when the mono mode is set using
the MPX button.

10EON

/

RDS indicators

EON – Lights when the EON mode is set (flashes

during EON reception). The indicator lights when
the current station carries the EON service.

RDS – Lights when an RDS broadcast is received.

11 Master volume level

12

SR+

Lights when the SR+ mode is switched on.

13

STREAM DIRECT

Lights when Direct / Pure Direct is selected.

14 Speaker indicators

Indicate the current speak er system, A and/or B.

15 Listening mode indicators

THX – Lights when a Home THX mode is selected.
ADV. SURROUND – Lights when an Advanced

Surround mode has been selected.

STEREO – Lights when the stereo mode is selected.
STANDARD – Lights when a Standard Surround

mode is switched on.

16

SLEEP

Lights when the receiver is in sleep mode.

17 Matrix decoding format indicators

PRO LOGIC IIx –This lights to indicate Pro

Logic II / Pro Logic IIx decoding.
Neo:6 – When one of the N eo:6 modes of the receiver

is on, this lights to indicate Neo:6 processing.

18 Character display

Displays various system information.

19 HDMI connection indicators

Light to indicate the HDMI input currently selected.

dB

SR+

being received in auto stereo mode.

F

14

1 234

VSX-LX50

5678

Display (VSX-91TXH/VSX-9120TXH-K)

1

SIGNAL

AUTO

PCM

SL S SR

HDMI

DIGITAL

ANALOG

STREAM DIRECT

THX

STEREO

SP

SBLSB

PRO LOGIC

ADV.SURROUND

STANDARD

AB

15

indicators

213 76591112

LCR

LFE

N

eo

: 6

SLEEP

DIGITAL

DTS WMA9 Pro

SBR

DSD

48

HD

MULTI-ZONE

PCM

S.RTRV

Light to indicate the currently selected input signal.
AUTO lights when the receiver is set to select the input
signal automatically.

2Program format indicators

These change according to which channels are active in
digital sources.

L – Left front channel
C – Center channel
R – Right front channel
SL – Left surround channel
S – Surround channel (mono)
SR – Right surround channel
SBL – Left surround back channel
SB – Surround back channel (mono)
SBR – Right surround back channel
LFE – Low frequency effects channel (the ((( ))) indicators light when

an LFE signal is being input)

3 Digital format indicators

Light when a signal encoded in the corresponding format
is detected (DSDPCM lights during the DSD (Direct
Stream Digital) to PCM conversion with SACDs).

4

S.RTRV

Lights when the Sound Retriever is switched on.

5

MULTI-ZONE

Lights when the MULTI-ZONE feature is active.

6

PHASE CONTROL

Lights when the Phase Control is switched on.

7Sound processing indicators

Light according to the active AV parameter(s).
OVER lights to indicate that the level of an analog source
is too high. ATT lights when you use the attenuator

(ANALOG ATT) to reduce it.

8

V.SB

Lights during Virtual surround back processing.

9

TUNER

indicators

TUNED – Lights when a broadcast is being received.
STEREO – Lights when a stereo FM broadcast is

being received in auto stereo mode.

10

DNR

PHASE ON

SOUND

T

ROLC

DIALOG E

Hi-Bit/Sampling

181413 16 1917

ATT

OVER

V.S B

STEREO

HDMI

TUNED

MONO

[ 1 ]

[ 2 ]

dB

SR+

MONO – Lights when the mono mode is set using
the MPX button.

10

SOUND

Lights when any of the Midnight, Loudness or tone
controls feature is selected.

11 Master volume level

12

SR+

Lights when the SR+ mode is switched on.

13

STREAM DIRECT

Lights when Direct / Pure Direct is selected.

14 Speaker indicators

Indicate the current speaker system, A and/or B.

15 Listening mode indicators

THX – Lights when a Home THX mode is selected.
ADV.SURROUND – Lights when an Advanced

Surround mode has been selected.

STEREO – Lights when the stereo mode is selected.
STANDARD – Lights when a Standard Surround

mode is switched on.

16

SLEEP

Lights when the receiver is in sleep mode.

17 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.

18 Character display

Displays various system information.

19 HDMI connection indicators

Light to indicate the HDMI input currently selected.

A

B

C

D

E

VSX-LX50

56

F

15

7

8

1234

Remote Control (VSX-LX50)

A

3 Input source buttons

Press to select control of other components.

4 Number buttons and other receiver/component

INPUT

RECEIVER

1

SELECT

SYSTEM OFF

SOURCE

12

2

controls

Use the number buttons to directly select a radio
frequency or the tracks on a CD, DVD, etc.

DISC (ENTER) can be used to enter commands for TV or
DTV, and also to select a disc in a multi-CD player.

13

DVR 2USB

TV DVR 1

DVD

CD-R/TAPE

3

iPod

TOP MENU

SETUP

GUIDE

D.ACCESS

PTY SEARCH

TV VOL

HDMI 1

SLEEP

SR+

DIALOG E

+10

TUNE

TUNE

TV CONTROL

INPUT

SELECT

B

4

5
6

7

C

REC

A

EON

MPX

8

9

10

11

B CDE

AUDIO

SUBTITLE

DISP

STATUS

SIGNAL SEL

MULTI OPE

THX

SHIFT

PHASE

CDHDMI 2

TUNER

S.RETRIEVER

DIMMER

ENTER

TV CH

REC STOP JUKEBOX

HDD
CH CH

PHOTO

SB ch

STANDARD

MCACC

STST

TV CTRL

RECEIVER

CLASS

ENTER

CH LEVELAV PARAMETER

BAND

VOL

MUTE

DVD

STEREO/
F.S.SURR

ADV.SURR

S.DIRECT

ANALOG

MIDNIGHT/
LOUDNES S

DISC

MENU

T.ED IT

RETURN

14

ATT

15

16

17

18

Press RECEIVER first to access:

SLEEP –

Use to put the receiver in sleep mode and

select the amount of time before sleep.
S.RETRIEVER – Press to restore CD quality sound to

compressed audio sources.
ANALOG ATT – Attenuates (lowers) the level of an

analog input signal to prevent distortion.
SR+ – Switches the SR+ mode

on/off.

DIMMER – Dims or brightens the display.
MIDNIGHT/LOUDNESS – Use Midnight when

listening to movie soundtracks at low volume. Use
Loudness to boost the bass and treble at low volume.

DIALOG E – Use to make dialog stand out when
watching TV or a movie.

Press

TUNER first to access:

D.ACCESS – After pressing, you can access a radio

station directly using the number buttons.
CLASS – Switches between the three banks (classes)

of radio station presets.

5 Tuner/component control buttons/

SETUP

These button controls can be accessed after you have
selected the corresponding input source button (DVD,
DVR1,TV, etc.). The BAND,T.EDIT and PTY SEARCH
tuner controls are explained. Press RECEIVER first to

RECEIVER

D

The remote has been conveniently color-coded according
to component control using the following system (press
the corresponding input source button to access):

• Green – Receiver controls (see below)

• Red – DVD controls

• Blue – Tuner controls

• Yellow – iPod controls

• White – Other controls

1 RECEIVER



This switches between standby and on for this receiver.

E

2 INPUT SELECT

Use to select the input source (use SHIFT for INPUT

access the following controls:

AV PARAMETER – Use to access the A

V options.

SETUP – Use to access the System Setup menu .
CH LEVEL – Press repeatedly to select a channel,

then use  to adjust the level.
RETURN – Press to confirm and exit the current

menu screen (also use to return to the previous menu
with DVDs or to

6



select closed captioning with DTV).

(TUNE/ST) /

ENTER

Use the arrow buttons when setting up your surround
sound system and the AV options.
Also used to control DVD menus/options and for deck 1
of a double cassette deck player. Use the TUNE
buttons to find radio frequencies and use ST to
find preset stations.

SELECT ).

F

16

VSX-LX50

1 234

5678

7TV CONTROL buttons

These buttons are dedicated to control the TV assigned to
the TV CTRL button. Thus if you only have one TV to hook
up to this system assign it to the TV CTRL input source
button. If you have two TVs, assign the main TV to the TV

CTRL button.

TV

 – Use to turn on/off the power of the TV.

TV VOL +/– – Use to adjust the volume on your TV.
INPUT SELECT – Use to select the TV input signal.
TV CH +/– – Use to select channels.

8 Component control buttons

The main buttons (,, etc.) are used to control a
component after you have selected it using the input
source buttons.

The controls above these buttons can be accessed after
you have selected the corresponding input source button
(for example DVD,DVR1 or TV). The f

ollowing controls

can be accessed when listening to the built-in tuner:

MPX – Switches between stereo and mono reception
of FM broadcasts. If the signal is weak then switching
to mono will improve the sound quality.

DISP – Switches between named station presets and
radio

frequencies. Also used to display RDS

information.
EON – Use to search for programs that are

broadcasting traffic or news information.

9

STATUS

Press to check selected receiver settings.

10

MULTI OPE

Use this button to perform multi operations.

11

SHIFT

Press to access the controls outlined in white boxes (for
example, INPUT SELECT ), or to display the currently
selected input source in the remote control LCD.

12

SOURCE

Press to turn on/off other components connected to the
receiver.

13 Character display (LCD)

This display shows information when transmitting
control signals.

The following commands are shown when you’re setting
the remote to control other components.

SETUP – Indicates the setup mode, from which you
choose the options below.

PRESET – See Selecting preset codes directly

LEARNING – See Programming signals f

rom other

remote controls.

MULTI OP – See Multi Operation and System Off.
SYS OFF – See Multi Operation and System Off.
DIRECT F – See Direct function.
RENAME – See Renaming input source names.
ERASE – See Erasing one of the remote control button

settings.
RESET – See

Resetting the remote control presets.

READ ID – See Confirming preset codes.

14 RECEIVER

Switches the remote to control the receiver (used to
select the green commands above the number buttons
(ANALOG ATT, etc.)). Also use this button to set up
surround sound.

15 VOL +/–

Use to set the listening volume.

16 MUTE

Mutes the sound or restores the sound if it has been
muted (adjusting the volume also restores the sound).

17Receiver controls

SIGNAL SEL – Use to select an input signal.
SB ch – Use to select the surround/virtual back

channel mode.
STEREO/F.S.SURR – Switches between the stereo

playback mode and the Front Stage Surround
Advance mode.

THX – Press to select a Home THX listening mode.
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.

18

PHASE– Press to switch on/off Phase Control.

MCACC – Press to switch between MCACC presets.

S.DIRECT – Press to select the Auto Surround mode
or the Stream Direct mode.
Stream Direct playback bypasses the tone controls
and any other signal processing for the most
accurate reproduction

of a source.

A

B

C

D

E

VSX-LX50

56

F

17

7

8

1234

Remote Control (VSX-91TXH/VSX-9120TXH-K)

A

3 Input source buttons

Press to select control of other components.

4 Number buttons and other receiver/component

INPUT

RECEIVER

1

SELECT

SYSTEM OFF

SOURCE

12

2

controls

Use the number buttons to directly select a radio
frequency or the tracks on a CD, DVD, etc.

DISC (ENTER) can be used to enter commands for TV or
DTV, and also to select a disc in a multi-CD player.

13

SIRIUS

TV DVR 1

HDMI 1

SLEEP

SR+

DIALOG E

+10

TUNE

TUNE

TV CONTROL

INPUT

SELECT

RECANT INFO

SUBTITLE

SIGNAL SEL

THX

PHASE

DVR 2

TUNER

S.RETRIEVER

DIMMER

ENTER

TV CH

REC STOP JUKEBOX

HDD
CH CH

PHOTO

SB ch

STANDARD

MCACC

STST

BAND

ADV.SURR

S.DIRECT

TV CTRL

ZONE 2HDMI 2CD

RECEIVER

CLASS

ENTER

CH LEVELAV PARAMETER

MENU

T.EDIT

RETURN

VOL

MUTE

DVD

STEREO/
F.S.SURR

ANALOG

MIDNIGHT/
LOUDNES S

DISC

14

ATT

15

16

17

18

XM RADIO

DVD

CD-R/TAPE

3

B

iPod

4

D.ACCES S

TOP MENU

5
6

SETUP

GUIDE

TV VOL

10

11

7

MPX

8

AUDIO

DISP

STATUS

9

MULTI OPE

SHIFT

C

Press RECEIVER first to access:

SLEEP –

Use to put the receiver in sleep mode and

select the amount of time before sleep.
S.RETRIEVER – Press to restore CD quality sound to

compressed audio sources.
ANALOG ATT – Attenuates (lowers) the level of an

analog input signal to prevent distortion.
SR+ – Switches the SR+ mode

on/off.

DIMMER – Dims or brightens the display.
MIDNIGHT/LOUDNESS – Use Midnight when

listening to movie soundtracks at low volume. Use
Loudness to boost the bass and treble at low volume.

DIALOG E – Use to make dialog stand out when
watching TV or a movie.

Press

TUNER first to access:

D.ACCESS – After pressing, you can access a radio

station directly using the number buttons.
CLASS – Switches between the three banks (classes)

of radio station presets.

5 Tuner/component control buttons/

SETUP

These button controls can be accessed after you have
selected the corresponding input source button (DVD,
DVR1,TV, etc.). The BAND and T.EDIT tuner controls are
explained. Press RECEIVER first to access the following

RECEIVER

D

The remote has been conveniently color-coded according
to component control using the following system (press
the corresponding input source button to access):

• Green – Receiver controls (see below)

• Red – DVD controls

• Blue – Tuner, XM and SIRIUS Radio controls

• Yellow – iPod controls

• White – Other

1 RECEIVER

controls



This switches between standby and on for this receiver.

E

2 INPUT SELECT

Use to select the input source (use SHIFT for INPUT

controls:

AV PARAMETER – Use to access the AV options.
SETUP

– Use to access the System Setup menu.

CH LEVEL – Press repeatedly to select a channel,
then use  to adjust the level.

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 w

6



(TUNE/ST) /

ENTER

ith DTV).

Use the arrow buttons when setting up your surround
sound system and the AV options.
Also used to control DVD menus/options and for deck 1
of a double cassette deck player. Use the TUNE
buttons to find radio frequencies and use ST to
find preset stations.

SELECT ).

F

18

VSX-LX50

1 234

5678

7TV CONTROL buttons

These buttons are dedicated to control the TV assigned to
the TV CTRL button. Thus if you only have one TV to hook
up to this system assign it to the TV CTRL input source
button. If you have two TVs, assign the main TV to the TV

CTRL button.

TV

 – Use to turn on/off the power of the TV.

TV VOL +/– – Use to adjust the volume on your TV.
INPUT SELECT – Use to select the TV input signal.
TV CH +/– – Use to select channels.

8 Component control buttons

The main buttons (,, etc.) are used to control a
component after you have selected it using the input
source buttons.

The controls above these buttons can be accessed after
you have selected the corresponding input source button
(for example DVD,DVR1 or TV). The f

ollowing controls

can be accessed when listening to the built-in tuner:

MPX – Switches between stereo and mono reception
of FM broadcasts. If the signal is weak then switching
to mono will improve the sound quality.

DISP – Switches between named station presets and
radio

frequencies.

9

STATUS

Press to check selected receiver settings.

10

MULTI OPE

Use this button to perform multi operations.

11

SHIFT

Press to access the controls outlined in white boxes (for
example, INPUT SELECT ), or to display the currently
selected input source in the remote control LCD.

12

SOURCE

Press to turn on/off other components connected to the
receiver.

13 Character display (LCD)

This display shows information when transmitting
control signals.

The following commands are shown when you’re setting
the remote to control other components:

SETUP – Indicates the setup mode, from which you
choose the options below.

PRESET – See Selecting preset codes directly.

LEARNING – See Programming signals

from other

remote controls.

MULTI OP – See Multi Operation and System Off.
SYS OFF – See Multi Operation and System Off.
DIRECT F – See Direct function.
RENAME – See Renaming input source names.
ERASE – See Erasing one of the remote control button

settings.

RESET – See

Resetting the remote control presets.

READ ID – See Confirming preset codes.

14 RECEIVER

Switches the remote to control the receiver (used to
select the green commands above the number buttons
(ANALOG ATT, etc.)). Also use this button to set up
surround sound. With SHIFT, this selects the
MULTI-ZONE control.

15 VOL +/–

Use to set the listening volume.

16 MUTE

Mutes the sound or restores the sound if it has been
muted (adjusting the volume also restores the sound).

17Receiver controls

SIGNAL SEL – Use to select an input signal.
SB ch – Use to select the surround/virtual back

channel mode.
STEREO/F.S.SURR – Switches between the stereo

playback mode and the Front Stage Surround
Advance mode.

THX – Press to select a Home THX listening mode.
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.

18

PHASE– Press to switch on/off Phase Control.
MCACC – Press to switch between MCACC presets.

S.DIRECT – Press to select the Auto Surround mode
or the Stream Direct mode.
Stream Direct playback bypasses the tone controls
and any other signal processing for the most
accurate reproduction

of a source.

A

B

C

D

VSX-LX50

56

E

F

19

7

8

1234

3. BASIC ITEMS FOR SERVICE

3.1 CHECK POINTS AFTER SERVICING

A

B

C

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

No.

Confirm whether the customer complain has
been solved. If the customer complain occurs
with the particular source, such as Dolby

1

Digital, DTS, AAC, DVD-A and HDMI, input it
for the operation check.

Check the analog audio playback.
(Make the analog connections with a DVD

2

player.)
Check the digital audio playback.

(Make the digital connections with a DVD

3

player.)
Check surround playback.

(Select Surround mode and check the

4

multichannel
Check the video outputs.

(Connect with a DVD player.)

5

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

6

Check the appearance of the product. No scratches or dirt on

7

Procedure Check points

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

Each channel audio and operations must be normal.

Each channel audio and operations must be normal.

Each channel audio and operations must be normal.

operations via the DSP circuit.)

Video and operations must be normal.

its appearance after receiving

it for service.

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

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

Block noise Distortion
Horizontal noise Noise

Dot noise Volume too low
Disturbed image (video jumpiness) Volume too high

Too dark Volume fluctuating
Too bright Sound interrupted
Mottled color

D

E

F

20

VSX-LX50

1 234

5678

3.2 PCB LOCATIONS

POWER AMP-L

AD

ASSY

IR I/O

AB

ASSY

AE

VSX-LX50

POSI 1-L
ASSY

AJ

BRIDGE 1

V

ASSY

ONLY

POWER PROTECT
ASSY

ASSY

POSI 2-L

AF

AA

DC/DC
ASSY

POWER AMP IN

AI

ASSY

AH

POWER AMP-R

AG

ASSY

LOCAL P-SUPPLY

Z

ASSY

POSI 1-R
ASSY

MULTI JOG

N

ASSY

HEADPHONE

O

ASSY

B

DISPLAY

L

ASSY

12V-REG
ASSY

FRONT-IN

P

ASSY

M

VOLUME
ASSY

A

B

C

VSX-LX50

ONLY

MAIN CONTROL

C

ASSY

GUARD-F

E

ASSY

USB ASSY

AL

GUARD-C

D

ASSY

AK

DSP ASSY

G

HDMI & DVC

ASSY

COMPONENT

K

ASSY

S-VIDEO

I

ASSY

COMPOSITE

H

ASSY

AUDIO IN

A

ASSY

BRIDGE 2

J

ASSY

VIDEO CONNECT

AC

ASSY

PS/SP ASSY

W

TRANS SIDE

Y

ASSY

X

R

S

U

DIODE 1

T

ASSY

PRIMARY

Q

ASSY

TRANS 2-2
ASSY

TRANS 1
ASSY

TRANS 2-1
ASSY

VH TR
ASSY

D

E

VSX-LX50

56

F

21

7

8

1234

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.

A

LIST OF ASSEMBLIES

Mark Symbol and Description

NSP 1..MAIN ASSY AWK7975 AWK7974 AWK7974

B

NSP 1..VIDEO ASSY AWK7984 AWK7983 AWK7983

NSP 1..COMPLEX ASSY AWK8015 AWK8014 AWK8014

C

VSX-LX50

/HYXJ5

VSX-91TXH

/KUXJ/CA

VSX-9120TXH-K

/KUXJ

2..MAIN CONTROL ASSY AWX8817 AWX8816 AWX8816

2..AUDIO IN ASSY AWX8821 AWX8820 AWX8820

2..12V-REG ASSY AWX8824 AWX8824 AWX8824

2..GUARD-C ASSY AWX8826 AWX8826 AWX8826

2..GUARD-F ASSY AWX8825 AWX8825 AWX8825

1..DSP ASSY AWX8814 AWX8813 AWX8813

2..COMPOSITE ASSY AWX8842 AWX8841 AWX8841

2..S-VIDEO ASSY AWX8845 AWX8844 AWX8844

2..COMPONENT ASSY AWX8848 AWX8847 AWX8847

2..BRIDGE 2 ASSY AWX8850 AWX8850 AWX8850

2..PRI

MARY ASSY AWX9035 AWX9034 AWX9034

2..TRANS 1 ASSY AWX9038 AWX9038 AWX9038

2..DISPLAY ASSY AWX8874 AWX8873 AWX8873

2..VOLUME ASSY AWX9111 AWX9044 AWX9044

2..MULTI JOG ASSY AWX8880 AWX8879 AWX8879

2..FRONT-IN ASSY AWX8955 AWX8954 AWX8954

2..HEADPHONE ASSY AWX9049 AWX9049 AWX9049

NSP 1..SECONDARY ASSY AWK7911 AWK7910 AWK7910

2..PS/SP ASSY AWX9107 AWX9052 AWX9052

2..TRANS SIDE ASSY AWX9056 AWX9056 AWX9056

2..TRANS 2-1 ASSY AWX9059 AWX9058 AWX9058

2..DIODE 1 ASSY AWX9060 AWX9060 AWX9060

2..VH TR ASSY AWX9061 AWX9061 AWX9061

D

2..TRANS 2-2 ASSY AWX9062 AWX9062 AWX9062

2..LOCAL P-SUPPLY ASSY AWX9064 AWX9063 AWX9063

2..IR I/O ASS

Y AWX9067 AWX9066 AWX9066

2..VIDEO CONNECT ASSY AWX9069 AWX9069 AWX9069

2..DC/DC ASSY AWX9015 AWX9015 AWX9015

2..BRIDGE 1 ASSY AWX9078 AWX9078 AWX9078

NSP 1..POWER AMP ASSY AWK7920 AWK7919 AWK7919

2..POWER AMP-L ASSY AWX9072 AWX9071 AWX9071

2..POWER AMP-R ASSY AWX9073 AWX9106 AWX9106

2..POWER AMP IN ASSY AWX9075 AWX9075 AWX9075

E

2..POWER PROTECT ASSY AWX9077 AWX9076 AWX9076

2..POSI 1-L ASSY AWX9081 AWX9080 AWX9080

2..POSI 2-L ASSY AWX9082 Not used Not used

2..POSI 1-R ASSY AWX9084 AWX9083 AWX9083

1..HDMI & DVC ASSY AWQ7040 AWQ7040 AWQ7040

1..USB ASSY AWX8866 Not used Not used

1..FM/AM TUNER UNIT AXX7248 AXX7250 AXX7250

F

22

1 234

VSX-LX50

5678

3.3 JIGS LIST

Jigs list

Name Jig No.Remarks

11P board to board extension jig
13P board to board extension jig cable

cable GGD1482

GGD1483
15P board to board extension jig cable GGD1484
21P board to board extension jig cable GGD1485
RS-232C I/F jig GGF1348
7-pin FFC VDA1681

Diagonosis
Diagonosis
Diagonosis
Diagonosis

Update the Flash ROMS
Update the Flash ROMS

CLEANING

Before shipping out the product, be sure to clean the following positions by using the prescribed cleaning tools:

Position to be cleaned Cleaning tools

Fans Cleaning paper : GED-008

A

B

C

D

E

F

VSX-LX50

56

23

7

8

1234

4. BLOCK DIAGRAM

4.1 OVERALL WIRING DIAGRAM

A

The
component parts indicates
the importance of the
safety factor of the part.
Therefore, when replacing,
be sure to use parts
of identical designation.

B

J54

C

D

17/450

ADD7540-

VSX-LX50 ONLY

A

AUDIO IN ASSY
(VSX-LX50 : AWX8821)
(VSX-91TXH, VSX-9120TXH : AWX8820)

E

23

CN512

23

CN501

CN507

20

F

mark found on some

D20PDY0410E

AA

DC/DC ASSY

4/170

XDX3028-

(AWX9015)

Shield Cable

CN701

USB ASSY

(AWX8866)

11

11

CN702

AL

A 1/2, A 2/2

23

CN951

23

CN401

G 1/4- G 4/4

20

CN901

G

DSP ASSY

(VSX-LX50 : AWX8814)

D15A04-100-2651

2451

*

M

VOLUME ASSY
(VSX-LX50 : AWX9111)
(VSX-91TXH, VSX-9120TXH : AWX9044)

P

CN2651

FRONT- IN ASSY
(VSX-LX50 : AWX8955)
(VSX-91TXH, VSX-9120TXH : AWX8954)

CN2652

3506

4/100

J3506

LOCAL P-SUPPLY ASSY

(VSX-LX50 : AWX9064)
(VSX-91TXH, VSX-9120TXH

: AWX9063)

J3504

4

CN652

10

B

12V-REG

J662

30

CN661

ADX7511

CN1001

AK

PF10PG-R07

10

WHT

ASSY
(AWX8824)

663

6/50

664

ADD7528-

J51

10/150

ADD7529-

J52

12/150

1/2, 2/2

23

CN1002

AK AK

HDMI & DVC ASSY (AWQ7040)

J663

OPT LINE

XM LINE
KU ONLY

23

CN5811

CN516

CN651

3

3/75

ADX7509

J662

Y661

CN953 CN301

30

CN801

(VSX-91TXH, VSX-9120TXH : AWX8813)

4/100
J2451

*1.5mm

Z

3502

D20PDD0605E

CN509

BRIDGE 1 ASSY

DISPLAY ASSY

L

2303

*

(VSX-LX50 : AWX8874)
(VSX-91TXH, VSX-9120TXH :

AWX8873)

CN2301

29

POSI 1-R ASSY

AH

(VSX-LX50 : AWX9084)
(VSX-91TXH, VSX-9120TXH : AWX9083)

PF05PG-Q15

12

CN3501

5

J3503

J3505

9

9/150

J3502

D20PDY0915E

9

CN102

CN101

CN113

C

23

23

MAIN CONTROL ASSY

CN302

CN513

(VSX-LX50 : AWX8817)

J4551

J55

29/330

ADD7532-

CN103

C 1/3- C 3/3

(VSX-91TXH, VSX-9120TXH : AWX8816)

20

20

CN301

CN511

CN281

23

23

AB

CN3702CN3701

IR I/O ASSY
(VSX-LX50 : AWX9067)
(VSX-91TXH, VSX-9120TXH

: AWX9066)

13

13

CN107

CN1401

K

11

11

CN104

CN1402

15

15

CN1202

CN109

13

13

CN1201

CN108

13

13

CN1003

CN111

CN106

11

11

CN1001

CN110

V

23

23

CN112

CN305

CN311

PF05PG-Q15
*KU only

(AWX9078)

23

23

CN5812

CN283

11

2302

MULTI JOG ASSY

N

(VSX-LX50 : AWX8880)
(VSX-91TXH, VSX-9120TXH : AWX8879)

AJ

5

CN5704

POWER PROTECT ASSY
(VSX-LX50 : AWX9077)

J56

19/330

ADD7533-

2/75

J4551

PG02KS-E07

PF09PG-R37

WHT

ORG

BRW

Y4(RS)

Y2(R)

Y4(SBR)

CN3703

(VSX-91TXH, VSX-9120TXH : AWX9076)

19

CN5702

CN5703

11

11

CN5302

2

CN5304

AG

POWER AMP-R ASSY

(VSX-LX50 : AWX9073)

(VSX-91TXH, VSX-9120TXH

CN5301

13

13

CN5602

POWER AMP IN ASSY

AI

(AWX9075)

CN3801

CN5303

CN5606

CN5603

9

: AWX9106)

6

6

19

VIDEO CONNECT
ASSY (AWX9069)

13

COMPONENT ASSY
(VSX-LX50 : AWX8848)

13

CN1403

(VSX-91TXH, VSX-9120TXH : AWX8847)

J1602

S-VIDEO ASSY

I

(VSX-LX50 : AWX8845)

15

15

(VSX-91TXH, VSX-9120TXH : AWX8844)

21

COMPOSITE ASSY

H

(VSX-LX50 : AWX8842)

21

(VSX-91TXH, VSX-9120TXH : AWX8841)

*

Y6

AC

CN1203

CN3802

CN1002

D20PDD1715E

17/150

J2501

19/125

CN3804

CN1406

CN3803

CN5706

Y1(C)

J58

*1

1902

AXM7029

FRONT FAN

VSX-LX50

3

ONLY

CN5701

11

11

CN5002

Y5

AD

CN5003

6

6

CN5605

YEL

ADD7535-

17

CN1405

17

CN520

2501

*

POWER AMP-L ASSY

11/120

J59

ADD7536-

17

CN2902

17

CN2901

(VSX-LX50 : AWX9072)

(VSX-91TXH, VSX-9120TXH

: AWX9071)

BRIDGE 2 ASSY

(AWX8850)

J

24

VSX-LX50

1 234

5678

A

HEADPHONE ASSY

O

(AWX9049)

D20PDY0410E

4

CN2851

POSI 1-L ASSY

(VSX-LX50 : AWX9081)
(VSX-91TXH, VSX-9120TXH

: AWX9080)

ADD7534-

17/90

CN5001

13

13

CN5601

17

CN5705

CN5004

CN5005

Y3(LS)

Y1(L)

Y3(SBL)

5604

11

CN1

PG02KS-E07

2

PG02KS2E07

2

GRY

GRN

PPL

J57

J4501

2/75

J4502

2/75

POSI 2-L
ASSY

(AWX9082)

D20PDY0525E

FM/AM TUNER UNIT
(VSX-LX50 : AXX7248)
(VSX-91TXH, VSX-9120TXH
: AXX7250)

No Schematic Diagram

J3201

4/100

5/250

J3201

AE

J4501

J4502

AF

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.

3201

12

J3401

PF12PG-R40

X

CN3202

(AWX9056)

TRANS SIDE ASSY

Y

13

CN3203

PF13PG-R07

ADX7457-Y2

ADX7459-Y1

ADX7404-

Y5

ADX7498-

Y6

ADX7460-Y4

ADX7458-Y3

PS/SP ASSY

(VSX-LX50 : AWX9107)
(VSX-91TXH, VSX-9120TXH : AWX9052)

TRANS 2-2 ASSY
(AWX9062)

18 17 16 1415 13 12 11 10 9

MAIN TRANS

T1501

NC

21

D20PDY0525E

13

CN3004

CN3003

CN3006

CN3005

5

J3009

2

2

2

2

3251

CN3252

J8

6

CN3351

6/100

ADX7512

3

4

24 2522 272623

D20PDY0610E

BLK

Y8 Y10Y9

Y13

CN3101

CN3102

BLK

ADX7512-

VL

BWN

ADX7502-

RED

ADX7504

Y11

W

NoAssign2

T.F.

NoAssign1

75

Y15Y14

BWN

GRY

GRY

ADX7501

ADX7500

ADX7503-

BLU

ADX7505

Y12

Q

PRIMARY ASSY
(VSX-LX50 : AWX9035)
(VSX-91TXH, VSX-9120TXH

: AWX9034)

9

9

CN3008

CN3007

CN2001

5

5

CN2003

CN2002

R
S

AC CORD

TRANS 1 ASSY
(AWX9038)
TRANS 2-1 ASSY

(VSX-LX50 : AWX9059)
(VSX-91TXH, VSX-9120TXH : AWX9058)

DIODE 1 ASSY

T

(AWX9060)
VH TR ASSY

U

(AWX9061)

BOARD IN

PF**PG-***
CABLE WIRE

1.25mm FFC
(*;1.00mm FFC)

2.0mm FLAT CABL
(*;1.5mm FLAT CABLE)

1.25mm FFC CONNECTOR(L)
(*;1.00mm FFC CONNECTOR)

1.25mm FFC CONNECTOR(I)
(*;1.00mm FFC CONNECTOR)

2.0mm CABLE HOLDER
(*;1.5mm CABLE HOLDER)

2.0mm WIRE TRAP

B*B-PH-K-S
PH CONNECTOR

ANOTHER TYPE CODE SOCKET

ANOTHER TYPE CODE CONNECTOR

XKP%%-A

1.25mm BOARD to BOARD

XKP%%-A

1.25mm BOARD to BOARD

KP250NA

2.5mm BOARD to BOARD

2.5mm BOARD to BOARD

ANOTHER TYPE BtoB SOCKET

ANOTHER TYPE BtoB CONNECTOR

E

B

C

D

E

F

VSX-LX50

56

25

7

8

1234

4.2 BLOCK DIAGRAM for AUDIO BLOCK

A

HDMI

IR I/O ASSY

AB

6

123742110

FRONT-IN
ASSY

IC701 IC741

3

TCC8600

84

82

83

81

78

22 1614 15 17

917151614

1720 314

CN2651

FOPT

2

FVL

14

MICOUT

11

D+

3

CN3701

CN3702

CN281

CN113

USB ASSY

10

7

4

1

TL

16 4

AL

AK

HDMI & DVC ASSY

CN1001

CN801

CN301

10

7

4

1

MAIN CONTROL ASSY

C

FOPT

FVL

MICOUT

SIRIUSL

CN516

77

CN702

17719

CN302

217

USB SPDIF

JA101

HDMI IN1

JA102

HDMI IN2

JA301

HDMI OUT

CN501

XM RADIO

JA351(1/2)

JA351(2/2)

COAX1

COAX2

XMDT

B

TL

6

CN1

CN3703

JA1601
SIRIUS

TUNER

VSX-91TXH,
VSX-9120TXH
ONLY

I

S-VIDEO ASSY

J1602

3

JA281

OPT IN1

JA282

OPT IN2

JA283

C

D

CDR/TAP E/MDLL

ANALOG INPUT

E

CDR/TAP E/MD

REC OUT

OPT IN3

OPT OUT

JA2652

FRONT OPT IN

JA2651

VIDEO/GAME

JA2701

MIC IN

VSX-LX50
ONLY

CN521(1

CN522(1/2)

CN522(2/2)

DVD /LD

CN523(1/3)

TV/SAT

CN523(3/3)

DVR/VCR1LL

CN524(2/2)

DVR/VCR2LL

CN521(2/2)

CN523(2/3)

DVR/VCR1

CN524(1/2)

DVR/VCR2

CN525(1/2)

CN526(1/2)

JA284

JA2751

/2)

CD L

USB

OPTIN1

OPTIN2

OPTIN3

OPTOUT

P

FOPT

FVL

L

MICOUT

D+

CN701

L

L

L

SL

42

44

AK4114VQ

46

1

3

5

16

CN901

CN112

56

58

60

64

66

70

IC301

DIR&

DIT

612 822 16

MIC

R2S152005FP

62 7977 7576737268

48

25

28

FOPT
USB SPDIF

1218 1628

L

FVL

OUT

FOPT

SIRI US

IC501

8ch
VOL.

Selector

(XM/DIR)

IC601

TC74VHC157FT

3

2

4

9

2ch ADC

CN507

CN509

TL

AOUTL

3650464840

34

32

31

30

28

17

12

9

7

2

TC74VHC157FT

19

17

Selector

(HDMI)

IC651

3

2

2

PRE Amp

3

L

3

SL

5

SW

3

C

3

SBL

DSP ASSY

G

IC101

ADSP-

21366KBCZ-1AA

L14

M14

M13

4

P14

MIX Amp

IC702

BA4560RF

12 3

1

1

7

1

1

SBLOUT

DT0O

P10

DT1O

1st

P11

DT2O

DSP

P12

DT3O

P13

IC701

BA4560RF

-L

I

C761
BA4560RF

IC741(2/2)

BA4560RF

IC741(1/2)

BA4560RF

IC781

BA4560RF

IC801
UPC4570G2

IC841
UPC4570G2

IC821(2/2)
UPC4570G2

IC821(1/2)
UPC4570G2

IC861
UPC4570G2

CN520

13

LOUT

9

SLOUT

7

SWOUT

5

COUT

1

LPF Amp

1

1

7

1

SBL

1

SL

SW

3

5

3

C

3

SBL

SW

C

AUDIO IN ASSY

A

VSX-LX50

CN525(2/2)

MULTI IN

F

CN526(2/2)

26

1 234

5678

A

IC201

DSPC56371AF180

1

2nd

80

DSP 8ch DAC

58 5 10

59 4

CN2901

LOUT

5

SLOUT

9

SWOUT

11

COUT

13

SBLOUT

17

FDTO

7

SDTO

6

CDTO

BDTO

CN501

CN2902 CN1405

513

99

11 7

13

17 1

TRANS SIDE ASSY

Y

HPL

CN3203

1

IC401

AK4359VF

3

9

11

AOUTL

3

FL

7

SL

11

SW

13

C

15

SBL

19

LOUT

SLOUT

SWOUT

5

COUT

SBLOUT

18

20

19

22

25

CN402

1210 86

SBLO

CO

SWO

SLO

FLO

L

IN

1173131519

LL

10

SL

SL

8

CC

14

SBL

12

CN5603

SBL

AI

CN1406

W

AD

CN5601

CN5001

L

11

3

SL

13

1

SBL

5

Q5604,Q5605

2SA1145,2SC2705

POWER AMP IN ASSY

9

C

Voltage Amp

PS/SP ASSY

POWER AMP-L ASSY

HPL

1

J3009

Q5004,Q5005

2SA1145,2SC2705

Q5104,Q5105

2SA1145,2SC2705

Q5204,Q2005

2SA1145,2SC2705

CG1

4

CG1

3

4

RY3005

CN3003 CN3005

L

Voltage Amp

SL

Voltage Amp

SBL

Voltage Amp

CN5003CN5605

45

POWER AMP-R ASSY

AG

CN5303CN5606

3

HEADPHONE ASSY

O

4

CN2851J3201

21 12

L

C

IC5001,IC5002
SAP17N,SAP17P

L

Current Amp

IC5101,IC5102
SAP17N,SAP17P

SL

Current Amp

IC5201,IC5202
SAP17N,SAP17P

SBL

Current Amp

IC5601

SAP17N

C

Current Amp

IC5602

SAP17P

C

Current Amp

SL

RY3001

RY3002

RY3003

RY3004

SBL

L

Y1(1/2)

SL

Y3(1/2)

SBL

Y3(2/2)

CE

66

CE

CN

5303 CN5606

CE

22

CE

11

JA2851

Y1(2/2)

CN5605CN5003

5

CN1501(1/2)

L

CN1502(1/2)

SL

CN1501(2/2)

SW

CN1501(2/2)

C

CN1502(2/2)

SBL

PHONES

CN3001

L
R

C

SL
SR

SBL
SBR

CN3002

PRE OUT

B

SPEAKERS

C

C

D

E

BRIDGE 2

J

ASSY

COMPONENT ASSY

K

VSX-LX50

56

F

27

7

8

1234

4.3 BLOCK DIAGRAM for VIDEO BLOCK

A

B

C

i-Pod

DVD /LD

TV/SAT

DVR/VCR 1

DVR/VCR 2

COMPOSITE ASSY

H

IC1006

PDC162A

OSD

CVOUT

13

Input Selector

for MultiRoom

TC74HC4051AFT

12

1

14

IC1001

TC74HC4051AFT

12

1

14

15

5

2

4

13

Selector

for Video

CN1001

913

3

Input

11

15

5

2

4

13

TC74HC4053AFT

1

2

12

13

3

5

Selector

for DVC/Through

CN1003

IC1003

IC1002

3

15

14

4

1

MUTE

4

MUTE

7

11

MUTE

14

MUTE

17

IC1004

LA7109

+

+

+

+

+

+

6dB AMP

VSX-91TX,
VSX-9120TXH

ONLY

35

33

31

25

23

21

MultiRoom
OUT

DVR/VCR 2
REC OUT

DVR/VCR 1
REC OUT

MONITOR
OUT

D

E

F

VIDEO

S-VIDEO

DVD /LD

TV/SAT

DVR/VCR 1

DVR/VCR 2

FRONT-IN ASSY

P

Y

C

36

Y

C

Y

C

Y

C

Y

C

CN2651

CN1201

from DVC

7

6

5

Input Selector

for S-Video

IC1201

TC74HC4051AFT

12

1

14

15

5

2

4

13

to DVC

3

Y Selector

IC1202

TC74HC4051AFT

12

1

14

15

5

2

4

13

3

C Selector

Sync

DET

to DVC

from DVC

91115 13

CN1202

IC1203

TC74HC4053AFT

2

1

5

3

12

13

Selector

for DVC/Through

IC1205

LA7109

+

Y MUTE

15

+

C

4

14 31

433

MUTE

+

7

+

11 25

MUTE

+

14 23

MUTE

+

6dB AMP

S-VIDEO ASSY

I

351

2117

Y

C

Y

C

Y

C

MONITOR
OUT

DVR/VCR 1
REC OUT

DVR/VCR 2
REC OUT

28

VSX-LX50

1 234

5678

COMPONENT

COMPONENT

COMPONENT

IN1

IN2

IN3

Cb

Cr

Cb

Cr

Cb

Cr

to DVC from DVC

Input Selector

for Component

TC74LVX4052FT

Y

Y

14

15

11

12

5

2

4

1

TC74LVX4052FT

14

15

11

Y

12

5

2

4

1

CN1401

IC1042

IC1041

13 911 2 64

Y

13

3

Cb

13

Cr

3

IC1043

TC74LVX4053FT

12

13

2

1

5

3

Selector

for DVC/Through

COMPONENT ASSY

K

Y

14

Cb

15

Cr

4

IC1044

NJM2581M

1

3

59

6dB AMP
&DRIVER

13

11

Y

Cb

Cr

OUT

COMPONENT

A

B

C

D

E

F

VSX-LX50

56

29

7

8

1234

5. DIAGNOSIS

5.1 DIAGNOSIS FLOWCHART

5.1.1 DSP TROUBLESHOOTING

A

Simplified diagnosis

Herein is described how to easily diagnose a defective part in the DSP Assy, only with operations of the main unit.

Errors in DSP Assembly (Areas simply and roughly predictable by machine operation only)

• Sound abnormality in phase control

If sound abnormality does not occur in the phase-control OFF state but occurs in the phase-control ON state, it is most likely
that a failure has occurred in SPAM (IC107), LATCH (IC103) or DECODER IC (IC105) in the 1st DSP Block.

• No sound at analog signal input
If sound abnormality does not occur with a digital signal input (COAX, OPT) but occurs only with an analog signal input,
it is most likely that a failure has occurred in the AD converter (IC481).

B

Troubleshooting

• It is assumed that there is no loose connection or damage in the LCRs.

• : KUXJ and KUXJ/CA types only

Step 0: Preliminary confirmation

Confirm the following items before checking

Do screws

of COAX Jack

C

D

securely tighten

?

Yes

Does a XM

antenna pull off?

Yes

To Step 1

Step 1: Connections

CN901, CN401, CN951, CN801

Are the

connectors securely

inserted?

Yes

No

Tighten screws securely.

No

Pull off a XM antenna.

No

Insert the connectors

securely.

Step 2: Power supply

CN901 (Pins 13,14)

Is the

voltage of digital

power around

5.2 V?

Yes Yes

IC301 (Pin 13)

Is the voltage
around 5.2 V?

Yes

CN301 (Pin 9)

Is the voltage
around 5.2 V?

Yes

Digital 5 V input

No

No

No

Is there

any loose connection

at pins 13,14 of

CN901?

Check the power output
of the main unit.

Check the parts and patterns
in the path.

Check the parts and patterns
in the path.

No

Replace CN901.

CN301, CN953

E

Are the

FFC securely

inserted?

Yes

To Step 2

No

Insert the FFCs

securely.

IC502 (Pin 5)

Is the voltage
around 5.2 V?

Yes

XM Load Switch

No

Check the parts and patterns
in the path.

A

F

30

1 234

VSX-LX50