Pioneer SC-LX71, SC-LX81 Schematic

PIONEER CORPORATION 4-1, Meguro 1-chome, Meguro-ku, Tokyo 153-8654, Japan

PIONEER ELECTRONICS (USA) INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A.
PIONEER EUROPE NV Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936

PIONEER CORPORATION

2008

SC-LX81

AUDIO/VIDEO MULTI-CHANNEL RECEIVER

SC-LX81

SC-LX71

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

Model Type Power Requirement Remarks

SC-LX81 HYSXJ5 AC 220 V to 230 V

SC-LX71 HYSXJ5 AC 220 V to 230 V

ORDER NO.

RRV3841

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

T- Z Z V AUG.

2008 Printed in Japan

1

[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.

a Safe environment should be secured during servicing.

When you perform repairs, please pay attention to static electricity, furniture, household articles, etc. in order to prevent injuries.
Please pay attention to your surroundings and repair safely.

2. Adjustments

To keep the original performance of the products, optimum adjustments and confirmation of characteristics within specification.
Adjustments should be performed in accordance with the procedures/instructions described in this manual.

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.

A

2 3 4

B

C

D

E

F

2

1

SC-LX81

2 3 4

5

6 7 8

CONTENTS

1. SERVICE PRECAUTIONS....................................................................................................................................................5

1.1 NOTES ON SOLDERING ............................................................................................................................................... 5

1.2 NOTES ON REPLACING PARTS ................................................................................................................................... 5

1.3 NOTES ON ASSEMBLING.............................................................................................................................................6

2. SPECIFICATIONS .................................................................................................................................................................8

2.1 ACCESSORIES.............................................................................................................................................................. 8

2.2 SPECIFICATIONS .......................................................................................................................................................... 9

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

3. BASIC ITEMS FOR SERVICE ............................................................................................................................................16

3.1 CHECK POINTS AFTER SERVICING ......................................................................................................................... 16

3.2 PCB LOCATIONS ......................................................................................................................................................... 17

3.3 JIGS LIST .....................................................................................................................................................................19

4. BLOCK DIAGRAM .............................................................................................................................................................. 20

4.1 OVERALL WIRING DIAGRAM ..................................................................................................................................... 20

4.2 AUDIO BLOCK DIAGRAM............................................................................................................................................ 22

4.3 DSP BLOCK DIAGRAM................................................................................................................................................ 24

4.4 HDMI NETWORK BLOCK DIAGRAM .......................................................................................................................... 25

4.5 MICROCOMPUTER BLOCK DIAGRAM ......................................................................................................................26

4.6 POWER BLOCK DIAGRAM .........................................................................................................................................28

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

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

5.2 CIRCUIT DESCRIPTION..............................................................................................................................................62

6. SERVICE MODE................................................................................................................................................................. 70

6.1 TEST MODE................................................................................................................................................................. 70

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

8. EACH SETTING AND ADJUSTMENT ................................................................................................................................78

8.1 HOW TO UPDATE FIRMWARE.................................................................................................................................... 78

9. EXPLODED VIEWS AND PARTS LIST............................................................................................................................... 84

9.1 PACKING SECTION ..................................................................................................................................................... 84

9.2 EXTERIOR SECTION .................................................................................................................................................. 86

9.3 CHASSIS SECTION.....................................................................................................................................................88

9.4 REAR PANEL SECTION ..............................................................................................................................................90

9.5 FRONT PANEL SECTION ............................................................................................................................................ 92

10. SCHEMATIC DIAGRAM....................................................................................................................................................94

10.1 AUDIO ASSY .............................................................................................................................................................. 94

10.2 D-MOTHER ASSY (1/4).............................................................................................................................................. 96

10.3 D-MOTHER ASSY (2/4).............................................................................................................................................. 98

10.4 D-MOTHER ASSY (3/4)............................................................................................................................................ 100

10.5 D-MOTHER ASSY (4/4)............................................................................................................................................ 102

10.6 FRONT IN and V-BRIDGE ASSYS........................................................................................................................... 104

10.7 232C & CONTROL ASSY......................................................................................................................................... 106

10.8 HDMI NETWORK ASSY (1/6) .................................................................................................................................. 108

10.9 HDMI NETWORK ASSY (2/6) .................................................................................................................................. 110

10.10 HDMI NETWORK ASSY (3/6) ................................................................................................................................ 112

10.11 HDMI NETWORK ASSY (4/6) ................................................................................................................................ 114

10.12 HDMI NETWORK ASSY (5/6) ................................................................................................................................ 116

10.13 HDMI NETWORK ASSY (6/6) ................................................................................................................................ 118

10.14 INTERFACE ASSY ................................................................................................................................................. 120

10.15 COMPONENT ASSY.............................................................................................................................................. 122

10.16 COMPOSITE S ASSY ............................................................................................................................................ 124

10.17 FRONT BRIDGE ASSY........................................................................................................

8 DISPLAY, VOL and POWER SW ASSYS ............................................................................................................... 128

0.1

1

10.19 PRE BRIDGE, ICE BUFFER, ICE SHIELD and PRIMARY GUARD ASSYS ......................................................... 130

10.20 ICE INTERFACE and ZOUT ASSYS ...................................................................................................................... 132

10.21 ICEPOWER AMP (1/5) ...........................................................................................................................................134

10.22 ICEPOWER AMP (2/5) ...........................................................................................................................................136

10.23 ICEPOWER AMP (3/5) ...........................................................................................................................................138

10.24 ICEPOWER AMP (4/5) ...........................................................................................................................................140

10.25 ICEPOWER AMP (5/5) ...........................................................................................................................................142

10.26 PRIMARY ASSY ..................................................................................................................................................... 144

10.27 REG ASSY ............................................................................................................................................................. 146

10.28 ICE REG ASSY ...................................................................................................................................................... 148

10.29 B REG ASSY..........................................................................................................................................................150

10.30 B DIODE, DCDC, and HDMI RECT ASSYS........................................................................................................... 152

11. PCB CONNECTION DIAGRAM...................................................................................................................................... 153

SC-LX81

5

6 7 8

.................................. 126

A

B

C

D

E

F

3

1

2 3 4

11.1 AUDIO ASSY ............................................................................................................................................................154

11.2 D-MOTHER ASSY ....................................................................................................................................................158

11.3 FRONT IN ASSY.......................................................................................................................................................162

11.4 232C & CONTROL ASSY.........................................................................................................................................163

A

11.5 HDMI NETWORK ASSY...........................................................................................................................................164

11.6 INTERFACE ASSY ...................................................................................................................................................168

11.7 COMPONENT and V BRIDGE ASSYS.....................................................................................................................172

11.8 COMPOSITE S ASSY ..............................................................................................................................................176

11.9 FRONT BRIDGE ASSY ............................................................................................................................................178

11.10 DISPLAY, POWER SW and VOL ASSYS ...............................................................................................................180

11.11 PRE BRIDGE, ICE BUFFER and ICE SHIELD ASSYS..........................................................................................184

11.12 ICE INTERFACE ASSY ..........................................................................................................................................186

11.13 ICEPOWER AMP ASSY .........................................................................................................................................188

11.14 ZOUT, PRIMARY GUARD and REG ASSYS..........................................................................................................192

11.15 PRIMARY ASSY .....................................................................................................................................................196

B

11.16 ICE REG ASSY.......................................................................................................................................................198

11.17 B DIODE and B REG ASSYS.................................................................................................................................200

11.18 DCDC and HDMI RECT ASSYS.............................................................................................................................202

12. ELECTRICAL PARTS LIST .............................................................................................................................................203

C

D

E

F

4

1

2 3 4

SC-LX81

5

• 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.

Ref No. FUNCTION Part No.

Remarks

IC101 HDMI Receiver SII9135CTU IC with heat-pad
IC701 MEDIA Processor DM850E IC with heat-pad
IC791 iPod Co-Processor 341S2154 IC with heat-pad

HDMI NETWORK

ASSY

ASSY NAME

Parts that is Difficult to Replace

SC-LX81: AWX9234
SC-LX71: AWX9235

PCB ASSY Part No.

6 7 8

1. SERVICE PRECAUTIONS

1.1 NOTES ON SOLDERING

1.2 NOTES ON REPLACING PARTS

A

B

C

D

E

5

SC-LX81

6 7 8

F

5

1

When assembling the ICE amplifier block, please note the following points of screws to prevent from short circuit.

The following 7 points of screws must always be used AMZ30P060FTC

2 3 4

1.3 NOTES ON ASSEMBLING

A

B

C

D

E

F

6

1

2 3 4

SC-LX81

5

If a screw at any of these points needs to be removed for service,
be sure to check that the swarf is not on the screw before refastening.

Points to be watched for swarf

6 7 8

A

B

C

D

E

5

6 7 8

SC-LX81

F

7

1

AM Loop Antenna
(ATB7013)

Remote Control Unit
(AXD7521)

Setup Microphone
(for Auto MCACC setup)
(APM7008)

• Caution Sheet SP

• Warranty Card

• Operating Instructions

FM Wire Antenna
(ADH7030)

AA/IEC R6P
Dry Cell Batteries

Power Cord
(ADG7062)

SR+ mini-plug cable
(ADE7095)

SERVICE PARTS

2. SPECIFICATIONS

2.1 ACCESSORIES

A

2 3 4

B

C

D

E

F

8

SC-LX81

1

2 3 4

Amplifier Section

Multi channel simultaneous power output (1 kHz, 1 %, 8 Ω)

7ch total . . . . . . . . . . . . . . . . .700 W (LX81), 630 W(LX71)

Continuous Power Output (Multichannel)
(DIN 1 kHz, THD 1 %, 6 Ω)

Front. . . . . . . 190 W + 190 W (LX81), 180 W + 180 W (LX71)

Center . . . . . . . . . . . . . . . . . . . . . 190 W (LX81), 180 W (LX71)

Surround . . . . . . . . . . . . . . . . . . . . . . . 190 W + 190 W (LX81)

180 W + 180 W (LX71)

Surround back . . . . . . . . . . . . . . . . . . 190 W + 190 W (LX81)

180 W + 180 W (LX71)
(DIN 1 kHz, THD 1 %, 8 Ω)

Front. . . . . . . 160 W + 160 W (LX81), 150 W + 150 W (LX71)

Center . . . . . . . . . . . . . . . . . . . . . 160 W (LX81), 150 W (LX71)

Surround . . . . . . . . . . . . . . . . . . . . . . . 160 W + 160 W (LX81)

150 W + 150 W (LX71)
Surround back . .

. . . . . . . . . . . . . . . . 160 W + 160 W (LX81)

150 W + 150 W (LX71)

Total harmonic distortion. . . . . . . . . . . . . . . . . . . . . . . . 0.05 %

(20 Hz to 20 kHz, 130 W, 8 Ω)
Rated Power Output – Stereo (20 Hz to 20 kHz, 0.09 %, 8 Ω)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 W+140 W

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

Audio Section

Input (Sensitivity/Impedance)

PHONO MM . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2 mV/47 kΩ

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

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

Output (Level/Impedance)

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

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

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

Signal-to-Noise Ratio
[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

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

HDMI Section

Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-pin

Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-pin (5 V, 100 mA)

Network Section

LAN terminal . . . . . . . . . . . . . . . . . . 10 BASE-T/100 BASE-TX

USB Section

USB terminal . . . . . . . . . . . . . . . . . . . . . . . USB2.0 Full Speed

FM Tuner Section

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

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

AM Tuner Section

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

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

Miscellaneous

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

Power Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . .330 W

In standby . . . . . . . . . . . . . . . .0.5 W (HDMI Control OFF)

0.7 W (HDMI Control ON)

Dimensions . . . . 420 (W) mm x 200 (H) mm x 459.5 (D) mm

Weight (without package). . . . . . . . . . . . . . . . . . . . . . . 18.5 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

Power cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

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

Operating instructions

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

• 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 & 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. © 1996-2007 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.

THX, the THX logo, Ultra2 Plus and Select2 Plus are trademarks of THX
Ltd. which may be registered in some jurisdictions. All rights reser ved.
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.

Specifications

5

2.2 SPECIFICATIONS

6 7 8

A

5

SC-LX81

6 7 8

B

C

D

E

F

9

1

1 STANDBY/ON

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

2 INPUT SELECTOR dial

Use to select an input source.

3 PHASE CONTROL indicator – Lights to indicate

Phase Control or Full Band Phase Control is selected.

ADVANCED MCACC indicator – Lights when one of

the Selecting MCACC presets is selected.

DIGITAL VIDEO SCALER indicator – Lights when

Resolution is set to a setting other than

PURE (for

example, when the video input signal is upscaled).

HDMI indicator – Blinks when connecting an HDMI-

equipped component; lights when the component is
connected.

4 Remote sensor

Receives the signals from the remote control.

5 Character display

[1] Front Panel

6 MASTER VOLUME dial

7 Front panel controls

To access the front panel controls, push gently on the
lower third portion of the panel with your finger.

8 AUDIO PARAMETER

Use to access the Audio options.

9 VIDEO PARAMETER

Use to access the Video options.

10 / / / (TUNE/ST) /ENTER

Use the arrow buttons when setting up your HOME MENU.
Use

TUNE / to find radio frequencies and use

ST / to find preset stations.

11 TUNER EDIT

Use with / / / /ENTER to memorize and name
stations for recall.

2.3 PANEL FACILITIES

A

B

2 3 4

C

D

E

F

10

1

2 3 4

SC-LX81

5

12 BAND

Switches between AM and FM radio bands.

13 Listening mode buttons

AUTO SURR/STREAM DIRECT

– Press to select Auto

Surround or Stream Direct listening.

HOME THX

– Press to select a Home THX listening mode.

STANDARD SURROUND

– Press for Standard
decoding and to switch between the various Pro
Logic IIx and Neo:6 options.

ADVANCED SURROUND

– Use to switch between
the various surround modes.

STEREO/A.L.C.

– Switches between stereo playback,
Auto level control stereo mode and Front Stage
Surround Advance modes.

14 MULTI-ZONE & SOURCE controls

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

15 SPEAKERS

Use to change the speaker system.

16 HOME MENU

Press to access the

HOME MENU

.

17 RETURN

Press to confirm and exit the current menu screen.

18 iPod DIRECT USB terminal

Use to connect your Apple iPod as an audio source,
or connect a USB audio device for playback.

19 VIDEO 3 INPUT

20 MCACC SETUP MIC jack

Use to connect the supplied microphone.

21 PHONES jack

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

6 7 8

A

B

C

D

E

F

SC-LX81

5

6 7 8

11

A

• 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.

1 LAN (10/100) terminal

2 HDMI connectors (x6 (SC-LX81), x5 (SC-LX71))

Multiple inputs and one (SC-LX71) or two (SC-LX81)
outputs for high-quality audio/video connection to
compatible HDMI devices.

3 Optical and coaxial digital audio inputs
(x7 (SC-LX81), x6 (SC-LX71))

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

4 Optical digital audio outputs (x2)

Use for recording to a CD or MiniDisc recorder.

ZONE3/SOURCE OUT

jack is also used for MULTI-ZONE

connections.

5 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.

6 Remote inputs/output

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

7 Control input/output

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

8 RS-232C connector

Use for connection to a PC for graphical output when
using Advanced MCACC or Full Band Phase Control.

9 Component video inputs (x3)

Use the inputs to connect any video source that has
component video output, such as a DVD player.

10

SC-LX81 only:

ZONE 2 component video output

Use to connect monitors or TVs in a separate room.

11 MULTI-ZONE audio/video outputs

Use to connect a second or third amplifier and monitors
or TVs in a separate room.

12 Stereo analog audio source inputs/(outputs) (x4)

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

13 Composite, S-Video and Component monitor
outputs

Use to connect monitors and TVs.

14 Audio/video source inputs/(outputs) (x8)

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.

15 AM and FM antenna terminals

Use to connect indoor or outdoor antennas for radio
broadcasts.

16 Multichannel pre-amplifier outputs

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

17 Multichannel analog audio inputs

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

18 Speaker terminals

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

19 AC power inlet

Connect the supplied power cord here.

[2] Rear Panel

B

1

2 3 4

C

D

E

F

12

1

SC-LX81

2 3 4

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

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 DSD (Digital

Stream Direct) 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 FULL BAND

Lights when the Full Band Phase Control is switched on.

7 PHASE CONTROL

Lights when the Phase Control or Full Band Phase
Control is switched on.

8 Sound processing indicators

Light according to the active Audio parameter(s)
and/or

ANALOG ATT

.

9 V.SB

Lights during Virtual surround back processing.

10 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

.

[3] Display

11 EON/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.

12 SOUND

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

13 Master volume level

Shows the overall volume level.

–80dB

indicates the

minimum level, and

+12dB

indicates the maximum level.

14 SR+

Lights when the SR+ mode is switched on.

15 STREAM DIRECT

Lights when Direct/Pure Direct is selected.

16 Speaker indicators

Lights to indicate the current speaker system, A and/or B.

17 Listening mode indicators

THX

– Lights when one of the Home THX modes 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.

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 Character display

Displays various system information.

21 Input source indicators

Light to indicate the input source you have selected.

5

6 7 8

A

B

5

SC-LX81

6 7 8

C

D

E

F

13

1

[4] Remote Control

The remote has been conveniently color-coded according
to component control using the following system:

•

White

– Receiver control, TV Control

•

Blue

– Other controls

1 MULTI-ZONE

operation selector switch
Switch to perform operations in the main zone, zone 2
and zone 3.

2 RECEIVER

This switches between standby and on for this receiver.

3 MULTI OPERATION

Use this button to perform multi operations.

4 Input source buttons

Press to select control of other components.

5 INPUT SELECT

Use to select the input source.

6 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

–

LEARNING

–

MULTI OP

–

SYS OFF

–

DIRECT F

–

RENAME

–

ERASE

–

RESET

–

READ ID

–

7 TV CONTROL buttons

These buttons are dedicated to control the TV assigned 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.

VOL +/–

– Use to adjust the volume on your TV.

INPUT

– Use to select the TV input signal.

CH +/–

– Use to select channels.

MUTE

– Use to mute the sound or cancel the mute

mode.

8 Tuner/component control buttons/HOME MENU

These button controls can be accessed after you have
selected the corresponding input source button (

DVD

,

DVR 1, TV

, etc.).

Set the operation selector switch to

RCV

to access the

following controls:

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).

9

/ / /

(TUNE +/–/ST +/–) /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

ST +/–

( / ) to find preset stations.

10 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, DVR 1

or TV). These buttons also

function as described below.

A

2 3 4

B

C

D

E

F

14

1

2 3 4

SC-LX81

5

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.
NOISE CUT MODE 1 to 2 can be selected
when receiving AM broadcasts.

EON

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

Set the operation selector switch to

RCV

first to access:

STATUS

– Press to check selected receiver settings.

PHASE CTRL

– Press to switch on/off Phase Control

or Full Band Phase Control.

CH LEVEL

– Press repeatedly to select a channel,

then use / to adjust the level.

11 Receiver controls

AUTO/DIRECT

– Press to select Auto Surround

or Stream Direct listening.

STEREO/A.L.C.

– Switches between the stereo
playback mode and the Front Stage
Surround Advance 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.

THX

– Press to select a Home THX listening mode.

12 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 TV or DTV.

After set the remote control operation switch to

RCV

:

SIGNAL SEL

– Use to select an input signal.

SLEEP

– Use to put the receiver in sleep mode and

select the amount of time before sleep.

DIMMER

– Dims or brightens the display.

SR+

– Switches the SR+ mode on/off.

SBch

– Use to select the surround/virtual surround

back channel mode.

MCACC

– Press to switch between MCACC presets.

A.ATT

– Attenuates (lowers) the level of an analog

input signal to prevent distortion.

GENRE

– Automatically selects the most appropriate
Advanced Surround mode for the genre of the source
currently being played back (this feature is available
only when a Pioneer DVD recorder supporting HDMI
Control is connected to this receiver via HDMI).

SC-LX81 only:

HDMI OUT

– Switch the HDMI output

terminal.

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.

13 SOURCE

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

14 Remote control illumination button

Press to turn on/off the illumination of some of the
buttons and the LCD light.

15 Remote control operation selector switch

Set to

RCV

to operate the receiver, TV or

SOURCE

to

operate the TV or the source device.
When this switch is set to

RCV

, the receiver can be

controlled (used to select the white commands above the
number buttons (

A.ATT

, etc.)). Also use this switch to set

up surround sound.

16 VOL +/–

Use to set the listening volume.

17 MUTE

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

6 7 8

A

B

C

5

SC-LX81

6 7 8

D

E

F

15

1

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:

Items to be checked regarding video

Block noise

Item to be checked regarding audio

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

No. Procedures Item to be checked

1

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.

2

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

Each channel audio and operations must be normal.

3

Check the digital audio playback.
(Make the digital connections with a DVD player.)

Each channel audio and operations must be normal.

4

Check surround playback.
(Select Surround mode and check the multichannel operations via
the DSP circuit.)

Each channel audio and operations must be normal.

5

Check the video outputs.
(Connect with a DVD player.)

Video and operations must be normal.

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

7

Check the appearance of the product.

No scratches or dirt on its appearance after receiving it for
service.

Cleaning the Fan

Before shipment, be sure to clean the fan,
using the following cleaning materials:

Cleaning paper : GED-008

2 3 4

3. BASIC ITEMS FOR SERVICE

3.1 CHECK POINTS AFTER SERVICING

A

B

C

D

E

F

16

1

2 3 4

SC-LX81

5

FRONT BRIDGE
ASSY

I

ICE BUFFER
ASSY

O

AUDIO
ASSY

A

ICEPOWER
AMP ASSY

Q

ICE INTERFACE
ASSY

P

ZOUT ASSY

S

PRIMARY ASSY

T

B DIODE ASSY

X

B REG ASSY

Y

H GUARD1 ASSY

H GUARD2 ASSYICE REG ASSY

W

HDMI NETWORK ASSY

E

FRONT IN ASSY

C

POWER SW ASSY

M

DCDC ASSY

Z

VOL ASSY

L

DISPLAY ASSY

K

HDMI RECT ASSY

PRIMARY GUARD ASSY

U

ICE SHIELD ASSY

R

COMPOSITE S ASSY

H

INTERFACE ASSY

F

232C & CONTROL
ASSY

D

D-MOTHER
ASSY

B

COMPONENT
ASSY

G

REG ASSY

V

V-BRIDGE ASSY

J

PRE BRIDGE
ASSY

N

AA

3.2 PCB LOCATIONS

6 7 8

A

B

C

D

E

F

5

SC-LX81

6 7 8

17

1

LIST OF ASSEMBLIES

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.

NOTES:

Mark Symbol and Description

SC-LX81
/HYSXJ5

SC-LX71
/HYSXJ5

NSP

NSP

NSP

NSP

NSP

NSP

NSP

1..ICEPOWER AMP ASSY AWH7017 AWH7017

1..COMPOSITE ICE ASSY AWM8106 AWM8106

1..PRIM DISPLAY ASSY

AWX9144 AWX9144

2..COMPOSITE S ASSY
AWX9145 AWX9145

2..ICE BUFFER ASSY
AWX9146 AWX9146

2..PRE BRIDGE ASSY
AWX9173 AWX9173

2..ICE SHIELD ASSY

AWM8120 AWM8129

2..PRIMARY ASSY

AWX9166 AWX9166

2..HDMI RECT ASSY

AWX9156 AWX9156

2..DISPLAY ASSY

AWX9158 AWX9238
AWX9159 AWX9159
AWX9160 AWX9160

1..FBRIDGE REG ASSY

2..REG ASSY

2..FRONT BRIDGE ASSY

1..AUDIO ASSY

2..AUDIO ASSY

2..232C & CONTROL ASSY

2..PRIMARY GUARD ASSY

1..HDMI NETWORK ASSY

1..FM/AM TUNER UNIT

AWX9161 AWX9161

1..COMPONENT FIN ASSY

2..COMPONENT ASSY

2..FRONT IN ASSY

2..ZOUT ASSY

AWP7058 AWP7064

1..INTERFACE REG ASSY

2..INTERFACE ASSY

2..ICE REG ASSY

2..B REG ASSY

2..B DIODE ASSY

AWX9196 AWX9202

1..DIGITAL MOTHER ASSY

2..D-MOTHER ASSY

2..ICE INTERFACE ASSY

2..DCDC ASSY

2..H GUARD2 ASSY

2..H GUARD1 ASSY

2..VOL ASSY

2..POWER SW ASSY

2..V-BRIDGE ASSY

AWX9137 AWX9137
AWX9138 AWX9138
AWX9147 AWX9147
AWX9174 AWX9174

AWR7067 AWR7067

AWX9148 AWX9148
AWX9149

AW

X9149
AWX9150 AWX9150
AWX9171 AWX9171

AWR7071 AWR7071

AWX9206 AWX9206
AWX9209 AWX9209
AWX9172 AWX9172

AWX9234 AWX9235

AXX7248 AXX7248

AWR7068 AWR7068

AWX9152 AWX9152
AWX9155 AWX9155

AWQ7058 AWQ7061

AWX9141 AWX9211
AWX9142 AWX9142
AWX9143 AWX9143

A

2 3 4

B

C

D

E

F

18

SC-LX81

1

2 3 4

5

[1] Jigs List

[2] Lubricants and Glues List

Name Jig No. Remarks

27P FFC GGD1588

Diagnosis

19P FFC GGD1589

Diagnosis

21P FFC GGD1590

Diagnosis

16P FFC GGD1591

Diagnosis

30p+13p board to board extension cable GGD1592

Diagnosis

17p+19p board to board extension cable GGD1593

Diagnosis

5p extension cable GGD1594

Diagnosis

Name Lubricants and Glues No. Remarks

Lubicating Oil GYA1001

Refer to “9.5 FRONT PANEL SECTION”

Silicone Grease GEM1057

Refer to “9.3 CHASSIS SECTION”

3.3 JIGS LIST

6 7 8

A

B

C

D

E

F

SC-LX81

5

6 7 8

19

1

FRONT IN ASSY

(AWX9142)

DCDC ASSY

(AWX9138)

HDMI RECT ASSY

(AWX9156)

INTERFACE ASSY

(AWX9148)

VOL ASSY
(AWX9159)

B REG ASSY

(AWX9150)

ZOUT ASSY

(AWX9143)

AUDIO ASSY

(AWX9206)

ICE BUFFER ASSY

(AWX9145)

ICEPOWER AMP ASSY

(AWH7017)

232C & CONTROL ASSY

(AWX9209)

HDMI NETWORK ASSY

(SC-LX81:AWX9234)
(SC-LX71:AWX9235)

D-MOTHER ASSY
(SC-LX81:AWX9196)
(SC-LX71:AWX9202)

COMPONENT ASSY
(SC-LX81:AWX9141)
(SC-LX71:AWX9211)

D

B

E

Z

F

G

C

L

Y

S

A

O

Q

AA

E 1/6- E 6/6

B 1/4- B 4/4

Q 1/5- Q 5/5

2 3 4

4. BLOCK DIAGRAM

4.1 OVERALL WIRING DIAGRAM

A

B

C

D

E

F

20

SC-LX81

1

2 3 4

POWER SW

ASSY

(AWX9160)

B DIODE ASSY

(AWX9171)

V-BRIDGE ASSY

(AWX9161)

COMPOSITE S ASSY

(AWX9144)

FRONT BRIDGE

ASSY

(AWX9155)

PRE BRIDGE

ASSY

(AWX9146)

PRIMARY GUARD ASSY

(AWX9172)

ICE INTERFACE ASSY

(AWX9137)

ICE SHIELD

ASSY

(AWX9173)

TUNER

MODULE

PRIMARY ASSY

(AWX9166)

REG ASSY
(AWX9152)

MAIN TRANS

ICE REG ASSY

(AWX9149)

DISPLAY ASSY
(SC-LX81:AWX9158)
(SC-LX71:AWX9238)

K

J

H

I

N

U

P

X

M

W

V

T

R

•

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.

5

6 7 8

A

B

C

D

5

SC-LX81

6 7 8

E

F

21

1

COAX2(CD)

IC701
MNP
DM850E

IC101
HDMI
RECEIVER
SII9135CTU

OPT IN1(TV/SAT)

OPT IN2(DVR2)

OPT IN3(VIDEO1)

COAX1(DVD)

BD

HDMI IN1

HDMI IN2

IC1151

HDMI SWITCH

SII9185ACTU

IC2401
DIR&DIT

AK4114VQ

IC2701
1st DSP
DSPA56720AG

IC2951
ADC
PCM1804DB

TX1

TX0

JA1101

JA1102

JA1103

JA2402

JA2403

JA2404

JA2408

VIDEO3

VIDEO3

USB

MIC

CD

CD-R

TV/SAT

DVR1

DVR2

TUNER Module

DVD

MULTI IN L/R

MULTI IN SL/SR

MULTI IN SBL/SBR

MULTI IN C/SW

SW DownMix

JA6202

JA6202

JA6202

JA6301

IC5301, IC5302

JA5002

JA5005

JA5005

JA5006

JA5007

JA5008

JA5009

JA5010

JA5010

PHONO

VIDEO1

VIDEO2

IC5255

PHONO/MULTI CH

SELECTOR
TC4053BFN

JA5001

JA5001

JA5004

JA5004

IC5351
VIDEO3/MIC
SELECTOR
TC4053BFN

MIC Amp

IC6201

NJM4565MD

FRONT IN ASSY

HDMI IN3

JA1104

NETWORK

JA701

IC861
ETHERNET
PHYCEIVER
RTL8201CP-LF

S/PDIF

COAX3(DVR2)

JA2401

(SC-LX81 MODEL)

(SC-LX71 MODEL)

OPT IN4(CD-R)

JA2405

I2S
DSD

I2S

HDMI NETWORK ASSY

D-MOTHER ASSY

S/PDIF
DSD

S/PDIF

DSD(SL)

PCM(C,SW,SL.SR,SBL,SBR)
DSD(FR,C,SW,SR)

IC2403

ZONE2 XM/NET

SELECTOR

IC2406,IC2409
S/PDIF
SELECTOR

IC2404
DIR/HDMI
SELECTOR

I2S

PCM(FL,FR)

DSD(FL)

A/D BUFFER

IC2901

NJM4565MD

I2S

B

E

C

4.2 AUDIO BLOCK DIAGRAM

A

2 3 4

B

C

D

E

F

22

1

SC-LX81

2 3 4

OPT OUT2

HDMI OUT1

DAC

WM8740SEDS

X4

IC252
BASIC AUDIO
SELECTOR

IC301
HDMI

TRANSMITTER

SII9134CTU

IC3451
ZONE2 DAC
AK4387ET

ZONE3/ OPT OUT1

LPF

JA301

JA2406

PREOUT L/R

PREOUT SW

PREOUT SL/SR

PREOUT SBL/SBR

CD-R REC

DVR1 REC

DVR2 REC

ZONE2 OUT

IC5201
Selector/Volume
/PRE Amp
BD3473KS2

IC5221
ZONE2/ZONE3
E-VOL
BD3814FV

SP L/R

SP C

SP SL/SR

SP SBL/SBR

HP

SW PRE Amp

IC5282

NJM4565MD

<<POWER AMP>>

JA6401

JA5002

JA5006

JA5007

JA6351

JA4101

JA4101

JA4301

JA4501

JA6502

JA6502

JA6501

JA6501

PREOUT C

JA6502

ZONE3 OUT

JA6401

HEADPHONE
AMP

IC5401

NJM4565MD

<<POWER AMP
INPUT BUFFER>>

IC6820,
IC6840

IC6800

IC6860,
IC6880

IC6900,
IC6920

FRONT IN ASSY

ICE BUFFER
ASSY

ICEPOWER AMP ASSY

<<PREOUT>>

COMPOSITE S ASSY

ZOUT ASSY

<<AUDIO ZONE OUT>>

AUDIO ASSY

IC351
HDMI

TRANSMITTER

SII9134CTU

JA351

HDMI OUT2

JA2407

IC2801
2nd DSP
DSPC56371AF180

IC2803
DSP/2ch DIRECT
SELECTOR

IC3051(FL,FR)
IC3151(C,SW)
IC3251(SL,SR)
IC3351(SBL,SBR)

SRC
SRC4190IDB
X4

IC3052(FL,FR)
IC3152(C,SW)
IC3252(SL,SR)
IC3352(SBL,SBR)

IC3001(FL,FR)
IC3101(C,SW)
IC3201(SL,SR)
IC3301(SBL,SBR)

IC3401
(ZONE2)

LPF

SC-LX71 MODEL

(SC-LX81 MODEL)

2ch PCM Only

I2S

(SC-LX81 MODEL)

NOTE
SPDIF:SONY/Philips Digital Interface
I2S:The Inter-IC Sound

A

S

O

Q

H

C

5

6 7 8

A

B

C

D

E

5

SC-LX81

6 7 8

F

23

1

DIGITAL IN

FLASH ROM

4Mbit

IC2202

16bit DATA BUS

18bit ADDRESS BUS

RST

SPI

ANALOG IN

FLASH ROM

16Mbit

IC2702

FLASH ROM

1Mbit

IC2802

SDRAM

64Mbit

IC2703

ADC

PCM1804DB

IC2951

I2S

RST

SELECTOR

TC74LCX157FTS1

IC2404

DSP1st (DECODER)

FREESCALE

DSP56720AG

IC2701

DSP2nd (PPP)

FREESCALE

DSPC56371AF180

IC2801

BUFFER

TC74LCX08FTS1

IC2805

DAC

WM8740SEDS

IC3052(FL,FR)

IC3152(C,SW)

IC3252(SL,SR)

IC3352(SBL,SBR)

ZONE2 DAC

AK4387ET

IC3451

CN2901

SRC

SRC4190IDB

IC3051(FL,FR)

IC3151(C,SW)

IC3251(SL,SR)

IC3351(SBL,SBR)

SC-LX81

MODEL ONLY

RST(NET)

SPI

S/PDIF

RST

SPI

RST

SPI

I2S

FD

I2S

I2S

I2S

2ch PCM DIRECT

BASIC AUDIO

I2S(2ch PCM)

RST SPI

I2S

I2S

I2S

I2S

I2C

I2S

D-MOTHER ASSY

8bit

DATA

BUS

21bit

ADDRESS

BUS

12bit

ADDRESS

BUS

MAIN µ-COM

PEG489B8

IC2001

DSP µ-COM

(128pin)

PEG396A

IC2201

RST

DIGITAL OUT

RST

HDMI

NETWORK

ASSY

16bit

DATA

BUS

SC-LX71

MODEL

SELECTOR

TC74LCX157FTS1

IC2803

RST(HDMI)

I2S

RST

RST

SPI

I2S

I2S(HDMI)

CN2902

VOLUME

CONTROL

DIR & DIT

AK4114VQ

IC2401

SELECTOR

TC74LCX157FTS1

IC2403

I2S(NET)

CN2402

(1/2)

CN2402(2/2)

CN2003

CN2008

B

E

4.3 DSP BLOCK DIAGRAM

A

B

2 3 4

C

D

E

F

24

1

2 3 4

SC-LX81

5

TMDS

Video BUS

Analog Video

AUDIO

HDMI

IN3

IN2

IN1

BD IN

HDMI Switch

HDMI Rx

SiI9185ACTU

SiI9135CTU

HDMI Tx

HDMI Tx

SiI9134CTU

SiI9134CTU

BusBuffer×3

TC74VCX541FT

GUI

µPD61111

"EMMA2LL"

Video Encoder

ADV7172KSTZ

HDMI OUT1

HDMI OUT2

CVBS

S

Component

CVBS

S

Component

ITU-R BT656

ITU-R BT656

Other circuit Block

HDMI/DVC Assy

CVBS

Component

for SUB ROOM GUI

ITU-R BT656

BusBuffer

TC74VCX541FT

Video Decoder

ADV7800BSTZ

Video Scaler

FLI2310-LF-CF

Network Cont

DM850E

BusBuffer

TC74VCX541FT

GUI

JPEG Slideshow

Ethernet

USB

PHY

RTL8201CP

iPOD IC

341S2154

I2S

SPDIF

SPDIF/DSD

I2S/DSD

I2S

JA1104

JA1103

JA1102

JA1101

IC1151

IC101

JA701

IC861

IC791

IC701

IC1404

IC1402

IC1701

IC401

IC601

IC1383

IC1381

IC1384

IC301

IC351

JA301

JA351

IC1301

TC74VHC157FTS1

IC251

SC-LX81 model only

6 7 8

4.4 HDMI NETWORK BLOCK DIAGRAM

A

B

C

5

SC-LX81

6 7 8

D

E

F

25

1

Hard Serial
Soft Serial
Select SW

zone
DAC

Main

u-com

HDMI

u-com

HDMI
Rx

HDMI

Tx

DSP

u-com

1st

DSP

2nd

DSP

DAC

FL

Driver

Network

iPod/DLNA

USB

RS

232C

Flash

ROM

EEP

ROM

EVENT

CEC

u-com

CEC

SR+

Flash
ROM

DISP

u-com

+GUI

Output

Flash

ROM

DDR

ADC

DIR

E-Vol

zone

E-Vol

HDMI
Tx

Scaler

V,DEC

Flash

ROM

DDR

TUNER

IC2001

IC2201

IC2201

IC2202

JA5801

JA5802
JA5803

JA1101-1104

IC1701

IC1951

IC1901

IC8001

IC8201

IC501

IC502

IC701

IC881

IC891

SDRAM

SDRAM

V,ENC

E

E

E

E

E

E

E

E

B

B

B

B

B

B

B

B

B

B

A

A

E

E

E

D

D

K

K

E

E

E

E

IC401

IC601

IC1301

IC301

IC101

IC5201

IC2401

IC2951

IC3451

IC3052
IC3152
IC3252
IC3352

IC2801

IC2701

IC5221

IC351

2 3 4

4.5 MICROCOMPUTER BLOCK DIAGRAM

A

B

C

D

E

F

26

1

2 3 4

SC-LX81

5

6 7 8

A

B

C

D

E

F

SC-LX81

5

6 7 8

27

1

V+5.6U

34

+BB +B

3

-BB -B

2

-B+10V

8

V+12L
V-12L
V+12R
V-12R
V+12C
V-12C
V+12SL
V-12SL
V+12SR
V-12SR
V+12SBL
V-12SBL
V+12SBR
V-12SBR

4

V+5_MD

V-5V_MD

6

V+12DF

V-12DF

V+12RY

V-12RY

6 3 COOLING FAN

V+FAN

V-FAN

2

V+12TRG

22

V+12HD

5

V+12A

5

V-12A

V+6AD

V+5.6U

V+7A

V-7A

V+12HD

V+12A

V-12A

V+6AD

2:/KU,/JJ
3:/H*,/LF

55

V+12TRG

V+5.6V

V-5.6V

V+5.6ST

V+12TRG

V+5.6V

V-5.6V

V+12TRG

V+5.6ST

V+5.6U

6

V+5.6U

V+5.6ST

-VF

V+5.6U

FLA

C1

FLAC2

V

+5.6ST

DISPLAY ASSY

CONPONENT ASSY

AUDI O
ASSY

REG ASSY

FRONT BRIDGE ASSY

PRIMARY ASSY

T8701
STBY Trans

IC8711
NJM78M56FA
+5.6V

T1501
POWER TRANS

B DIODE
ASSY

B REG
ASSY

Q7300
2SD2083(Y)
+64V

RECTIFIER

D7400,D7401,
C7400,C7401

(+70V/-70V)

Q7301
2SB1383(Y)

-64V

ICE REG ASSY

Q7241
2SD1763A(DE)

-B+11V (-53V)

Q7242

2SB1186A(DE)

-6.9V

IC7252
NJM79M12FA

-12V

IC7251
NJM78M12FA
+12V

Q7241

2SD1763A(DE)

+6.9V

IC7271
NJM78M05FA
+5V

IC7272
NJM79M05FA

-5V

Q7201

Q7202

TO OUTPUT STAGE

TO GATE DRIVER

TO MODULATOR

TO INPUT STAGE

TO PROTECTION RY

IC7502
NJM79M12FA

-12V

IC7501
NJM78M12FA
+12V

IC7521
NJM78M06FA
+6V

IC7611
NJM78M12FA
+12V

IC7601
NJM78M56FA
+5.6V

IC7602
NJM79M05FA

-5.6V

D7625
PTZ24(B)

-24V

D7624
HZU6R2(B)

-30V

Q5601

2SD1664(PQR)

+9V

Q5501

2SD1858X(QR)

+7V

Q5502

2SB1237X(QR)

-7V

TUNER MODULE

V+5.6U

V+T12R

D6002
RR264M-400
+5V

Q6015
2SC4154(EFG)
+3V

D6003
RR264M-400

-5V

Q6016
2SA1602A(EF)

-3V

V+5V

V+5V

V-5V

V-5V

V-3V

V+3V

HDMI RECT
ASSY

RECTIFIER

D8801,C8801
(+15.5V)

G

I

AV

T

K

Q

Y

X

W

ICEPOWER AMP ASSY

AA

4.6 POWER BLOCK DIAGRAM

A

2 3 4

B

C

D

E

F

28

1

2 3 4

SC-LX81

5

V+12L
V-12L
V+12R
V-12R
V+12C
V-12C
V+12SL
V-12SL
V+12SR
V-12SR
V+12SBL
V-12SBL
V+12SBR
V-12SBR

2

V+D V+6D

2

V+6D

V+5.6U

V+5.6U V+5.6U

V+7A

V-7A

V+7A

V+12HD V-7A

V+5D(FOR OPT IN)

V+5D(FOR USB)

V+12A V+12A

V-12A V-12A

V+6AD V+6AD

V+12TRG

V+12TRG

V+5.6V

V+5.6V

V-5.6V

V-5.6V

V+12TRG

V+5.6ST

V+5.6U

2

V+5D

V+12HD

DCDC ASSY

V-BRIDGE
ASSY

FRONT IN
ASSY

INTERFACE
ASSY

ICE INTERFACE
ASSY

D6502
RR264M-400
+5V

D6503
RR264M-400

-5V

V+5V

V-5V

RECTIFIER
D7101,C7104
(+15V)

IC3901

PQ1CG3032FZ

+6V

V+5.6ST

V+5.6U

V+12HD

DC-DC

DC-DC

DC-DC

DC-DC

V+1R8H

D

V+3R3H

D

LDO

LDO

LDO

LDO

LDO

LDO

LDO

LDO

2.5V for EMMA2LL's DDR-SDRAM

1.5V for EMMA2LL Core

V+5AHD,V+5DHD

HDMI OUT1 EXT 5V SUPPLY

HDMI OUT2 EXT 5V SUPPLY

V+5N

3.3V for Network
Block

1.8V for BridgeCo
Core

V+2R5DDR_EM

IC1021
LTC 3850EGN

IC1051
LT3505EMS8E

IC1001
TPS54350PWP

IC1902
S-1132B25­U5

IC1702 NJM2885DL1-

IC1071
NJM2885DL1­05

IC302
NJM2872BF05

IC352
NJM2872BF05

IC31 NJM2886DL3-33

IC11
NJM2846DL3­33

IC21
NJM2846DL3-

18

+1.8V

+3.3V

+2.5V

+1.5V

+6V +5V

+5V

+5V

+5V

+3.3V

+3.3V +1.8V

V+1R5HD

V+1R8

V+3R3

5V for Network Logic,USB
VBUS

5V for HDMI Logic,Video
Buffer

3.3V for HDMI/DVC

1.8V for HDMI/DVC

SC-LX81 Only

IC2413
NJM2845DL1-05
+5V

OPT IN/OUT
DIR

V+5D

IC2412
NJM2880U1-33
+3.3V

DIR
LOGIC

V+3D

IC2706
NJM2872BF-33
+3.3V

OSC

V+3OS

IC2982
NJM2885DL1-33
+3.3V

SRC (SC-LX81 only)

V+3SR

IC2710
NJM2846DL3-33
+3.3V

IC2711
PQ1LAX95MSPQ
+1.25V

V+3DS

V+1DS

1st DSP
2nd DSP

2nd DSP core

IC2713
NJM2846DL3-25
+2.5V

IC2712
RP131H101D
+1V

1st DSP core

V+1DF

D2003

D2004

IC2011
NJM2880U1-33
+3.3V

DSP ucom

V+3DM

D2002

D2001

V+5US

V+5UM

+5V

+5V

MAIN ucom

MAIN ucom

IC2983
NJM2845DL1-05
+5V

IC2983
NJM2391DL1-33
+3.3V

V+5DA

V+3DA

DAC
ADC

DAC
ADC

V+12A

V-12A

LPF
ADC IN

Q2006
FLASH ROM write control

D-MOTHER ASSY

B

Z

C

H

J

E

F

P

COMPOSITE
ASSY

HDMI NETWORK ASSY

6 7 8

A

B

C

D

E

5

SC-LX81

6 7 8

F

29

1

[1] Audio Section Troubleshooting

No Sound Produced

Other

Specific Function

• Perform NETWORK
Diagnosis

[Distinction the Symptom]

• Does the symptom occur only with a specific function?
(HMG, HDMI System, Others)

• Does the same symptom occur with more than one function?

[Distinction between analog and digital problem]

 Set the speaker setting to "Large" for all the channels.
 Set the function to "Multi Ch In".
 Set the listening mode to "Pure Direct".
 Fix the signal switching to "Analog".

NGOK

[Distinction between preout and power problem]

• Is the pre-out output?

Failure in power

amplifier

• Perform ICEPOWER
Diagnosis

NG

OK

Failure in analog

small signal block

[Distinction between AD line and other digital problem]

• Is the sound produced with the digital input?
# With the signal switching set to "Auto".

NG

OK

Failure in

A/D converter

More than

one function

[Distinction between DSP and other problem]

 Input the PCM (such as CD) signals.
 Change the listening mode to "Pure Direct (PCM Direct)".
 Set the signal switching to "Auto" or "PCM".

NGOK

Failure in DSP

• Perform DSP
Diagnosis

Failure in DIR

[Distinction between DIR and other problem]

• Is the input assumed to be digital with
the signal switching set to "Auto"?

(Is DIR locked in digital?)

Failure in D/A

converter

OK NG

HDMI System

Function

(BD, HDMI IN1-3)

HMG

Function

• Perform HDMI
Diagnosis

• Failure around the
circuit from input
terminal to the switch

5. DIAGNOSIS

5.1 DIAGNOSIS FLOWCHART

A

2 3 4

B

C

D

E

F

30

1

2 3 4

SC-LX81