Nad M-15 Service Manual

NAD ELECTRONICS INTERNATIONAL

TORONTO



M15 C/AH

SURROUND

SOUND PREAMPLIFIER

SURROUND

SERVICE MANUAL

M15 C/AH

02'(/ 06(59,&(0$18$/

SERVICE MANUAL

SOUND PREAMPLIFIER

SURROUND

M15 C/AH



CONTENTS

SECTION 1 . . . .SUMMARY

SECTION 2 . . . .CABINET & MAIN CHASSIS

SECTION 3 . . . .ELECTRICAL

SECTION 4 . . . .REPLACEMENT PARTS LIST

SECTION 5 . . . .VERSION HISTORY

SECTION 1

SUMMARY

CONTENTS

PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO PRODUCTS

SERVICING PRECAUTIONS ........................................................................... 1-3

• General Servicing Precautions

• Insulation Checking Prodedure

• Electrostatically Sensitive Devices

ADJUSTMENT PROCEDURE .............................................................................

• OSD VCO Oscillation Frequency (VIDEO BOARD)

SPECIFICATIONS ........................................................................................... 1-5

............. 1-2

1-4

1-1

PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO PRODUCTS

CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY, NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFACTURER’S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANY RESULTING PROPERTY DAMAGE OR USER INJURY.

SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY CHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE,INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE USER.

WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTECTION FROM A.C. LINESHOCK.

SAFETY CHECKS

AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRCTED. A CHECK SHOULD BE MADE OF THE FOLLOWING.

SUBJECT : FIRE & SHOCK HAZARD

1.BE SURE THAT ALL COMPONENTS ARE POSI-

TIONED IN SUCH A WAY AS TO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS.THIS IS ESPECIALLY IMPORTANT ON THOSE MODULES WHICH ARE TRANSPORTED TO AND FROM THE REPAIR SHOP.

2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE DEVICES SUCH AS INSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN RELIEFS, POWER SUPPLY CORDS, AND OTHER HARDWARE HAVEBEEN REINSTALLED PER ORIGINAL DESIGN. BE SURE THAT THE SAFETY PURPOSE OF THE POLARIZED LINE PLUG HAS NOT BEEN DEFEATED.

3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLE COLD SOLDER JOINTS, SOLDER SPLASHES OR SHARP SOLDER POINTS. BE CERTAIN TO REMOVE ALL LOOSE FOREIGN PARTICLES.

4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR DETERIORATION TO PARTS AND COMPONENTS. FOR FRAYED LEADS, DAMAGED INSULATION (INCLUDING A.C. CORD). AND REPLACE IF NECES-

5. NO LEAD OR COMPONENT SHOULD TOUCH A RECIVING TUBE OR A RESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUND PROTRUNING METAL SURFACES MUST BE AVOIDED.

6. ALL CRITICAL COMPONENTS SUCH AS FUSES, FLAMEPROOF RESISTORS, CAPACITORS, ETC. MUST BE REPLACED WITH EXACT FACTORY TYPES, DO NOT USE REPLACEMENT COMPONENTS OTHER THAN THOSE SPECIFIED OR MAKE UNRECOMMENDED CIRCUIT MODIFICATIONS.

7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM AN A.C. LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABINET, (THE CHANNEL SELECTOR KNOB, ANTENNA TERMINALS. HANDLE AND SCREWS) TO BE SURE THE SET IS SAFE TO OPERATE WITHOUT DANGER OF ELECTRICAL SHOCK. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS TEST USE AN A.C. VOLTMETER, HAVING 5000 OHMS PER VOLT OR MORE SENSITIVITY, IN THE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESISTOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CONDUIT,ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME. MEASURE THE A.C. VOLTAGE ACROSS THE COMBINATION OF 1500OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG AND REPEAT A.C. VOLTAGE MEASUREMENTS FOR EACH EXPOSED METALLIC PART. VOLTAGE MEASURED MUST NOT EXCEED 75 VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY.

A.C. VOLTMETER

GOOD EARTH GROUND SUCH AS THE WATER PIPE. CONDUIT. ETC

PLACE THIS PROBE ON EACH EXPOSED METAL PART

SUBJECT: GRAPHIC SYMBOLS

THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.

THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE.

1-2

SERVICING PRECAUTIONS

CAUTION: Before servicing the Surround sound preamplifier

covered by this service data and its supplements and addends, read and follow the SAFETY PRECAUTIONS. NOTE: if unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions in this publication, always follow the safety precautions. Remember Safety First:

General Servicing Precautions

1. Always unplug the Surround sound preamplifier AC power cord from the AC power source before:

(1) Removing or reinstalling any component, circuit board,

module, or any other assembly.

(2) Disconnecting or reconnecting any internal electrical plug

or other electrical connection.

(3) Connecting a test substitute in parallel with an electrolytic

capacitor.

Caution: A wrong part substitute or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard.

2. Do not spray chemicals on or near this Surround sound

preamplifier or any of its assemblies.

3. Unless specified otherwise in this service data, clean

electrical contacts by applying an appropriate contact cleaning solution to the contacts with a pipe cleaner, cotton tipped swab, or comparable soft applicator. Unless specified otherwise in this service data, lubrication of contacts is not required.

Electro statically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electro statically Sensitive (ES) Devices. Examples of typical Es devices are integrated circuits and some field effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.

1. Immediately before handing any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reason prior to applying power to the unit under test.

2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.

4. Use only an antistatic solder removal device. Some solder removal devices not classified a “anti-static” can generate electrical charges sufficient to damage ES devices.

5. Do not use Freon propelled chemicals. These can generate electrical charge sufficient to damage ES devices.

4. Do not defeat any plug/socket B+ voltage interlocks with which instruments covered by this service manual might be equipped.

5. Do not apply AC power to this Surround sound preamplifier and/or any of its electrical assemblies unless all solid-state device heat sinks are correctly installed.

6. Always connect test instrument ground lead to the appropriate ground before connecting the test instrument positive lead. Always remove the test instrument ground lead last.

Insulation Checking Procedure Disconnect the attachment plug from the AC outlet and turn the power on. Connect an insulation resistance meter (500V) to the blades of the attachment plug. The insulation resistances between each blade of the attachment plug and accessible conductive parts (Note 1) should be more than 1 M-ohm. Note 1: Accessible Conductive Parts including Metal panels, Input terminals, Earphone jacks, etc.

6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil, or comparable conductive material).

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed.

Caution: Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

8. Minimize bodily motions when handing unpackaged replacement ES devices. (Normally harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES device.)

1-3

ADJUSTMENT PROCEDURE

OSD VCO Oscillation Frequency (VIDEO BOARD)

Connect M15 CVBS monitor out to a TV set. Press “Enter” key on remote control to call OSD out. Then clockwise adjust C1162 and observe the OSD till the characters are just disappear, record the adjustment slot position A; then anticlockwise C1162 to make the OSD characters disappear and record the adjustment slot position B again. Adjust the adjustment slot position in the middle of A and B. Get in “DISPLAY SETUP” OSD Menu and switch the unit in both “NTSC” and PAL” mode, observe the OSD characters, they should be all stable displaying without any flicker.

C1162

VIDEO BOARD

SOFTWARE VERSION:

TO DISPLAY SOFTWARE VERSIONS, PRESS FRONT PANEL video & audio SIMULTANEOUSLY

1-4

SPECIFICATIONS

DECODING FORMATS

Dolby Digital, Dolby Digital EX, Dolby Pro Logic II, Dolby Pro Logic IIx, DTS, DTS ES,

DTS Neo:6, DTS 96/24, THX Surround EX, THX Ultra 2

SAMPLING RATES 32kHz, 44.1kHz, 48kHz, 88.2k, 96kHz

MODES EARS, Enhanced stereo, Mono

VIDEO (input and output impedance)

75Ω

THD + NOISE 0.002%

PRE-AMP SECTION LINE LEVEL INPUTS

Input impedance(R + C) 56KΩ/180PF

Frequency response(20Hz to 20KHZ) 20Hz to 20kHz @ +/-0.3dB

LINE LEVEL OUTPUTS

Output impedance 470Ω

Tape Source Z + 2kΩ

Signal/noise ratio >102dB

Maximum Output Level 6Vrms

Multiroom Output (Zone 2) 470Ω

TONE CONTROLS

Bass ±10dB@20Hz

Treble ±10dB@20kHz

Center Dialog ±6dB@1kHz

+12VOLT TRIGGER OUT

Output Voltage +12V +/- 20%

Minimum Output Current >40ma

Maximum Short Circuit Current <60mA

PHYSICAL SPECIFICATIONS

Operating temperature: 5 °C to 35 °C (41 °F to 95 °F)

Operating humidity: 5 % to 90 %

Dimensions (W x H x D) NET 17.13 x 5.24 x 13.98"(435 x 133 x 355mm)

Gross* 17.13 x 5.79 x 14.96”(435 x 147 x 380mm)

Net Weight 15 lbs

Shipping Weight 20 lbs

1-5

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

EXPLODED VIEWS.................................................................................. 2-2

1. Cabinet and main frame section...................................................................

2. Packing accessory section.............................................................................

3. Exploded view parts list................................................................................. 2-4

2-2

2-3

2-1

EXPLODED VIEW

1.Cabinet and mainframe section

NOTE: S009, S004, S005, S006, C004, C005, C006, C007, & C008 are sold as one part number; 18-51512-00

S009

S008

S007

C007

C005

C006

C005

C004

C008

S006

R006

R003

S003

R008

S003

R002

S022

S021

T001

S023

R009

R010

T002

T003

S017

S015

S013

S018

S020

S019

S012

F009

S016

F011

F012

F013

S014

S013

S015

F010

S011

FP01

F004

S005

S010

F005

S013

F003

S004

F002

S012

S003

S001

C003

C001

C002

S002

R005

S013

R007

R001

R004

P01

S019

S002

(1:2)

F007

F006

F001

F008

2-2

2.Packing accessory section

P016

P014

P013

P012

P011

P010

P009

P008

P007

P006

P005

P004

P015

P003

P002

P001

2-3

3. EXPLODED VIEW PARTS LIST

REF.NO PART NO. DESCRIPTION Qty. REF.NO PART NO. DESCRIPTION Qty.

C001 67-043002-0 Chassis 1 S006 63-010816-0

C002 83-048010-0 Foot Assy 4 S007 63-020616-0

C003 01-51506-00 PSU Board 1 S008 61-226508-0 Hex Screws 6X8, 4

C004 66-001008-0 Metal Disc 1 S009 64-208060-1 Bolts GB/T70.1 M8X60 1

C005 Transformer rubber pad 2 S010 61-224508-1 Hex Screws GB/T70.1 4X8 8

C006 18-51512-00 Transformer 1 S011 61-224512-1 Hex Screws GB/T70.14X12 7

C007 67-043007-0 Shielding Box 1 S012 61-063106-0 Self Taping Screws STF3X6 8

C008 94-043001-0 Transformer label 1 S013 61-023208-0 Self Taping Screws BTB3X8 55

C009 75-043002-0 PCB Guide 4 S014 62-010302-1 M3 Lock-Nut 4

S015 61-023508-0 Machine Screws MB3X8 6

F001 70-043011-0 M15 Fascia 2 1 S016 61-023206-0 Self Taping Screws BTB3X6 3

F002 67-043003-1 Subfascia 1 S017 61-246508-0 Machine Screws M6X8 4

F003 70-043010-1 M15 Fascia 1 1 S018 61-024506-0 Machine Screws MB4X6 1

F004 01-51503-00 FPP Board 1 S019 61-023106-0 Self Taping Screws STB3X6 11

F005 01-51507-00 Encoder Board 1 S020 61-023506-0 Machine Screws MB3X6 3

F006 76-048010-0 Window lens 1 S021 62-010302-2 M3 Nut 2

F007 70-048014-0 Knob Skin 1 S022 62-010402-1 M4 Nut 1

F008 75-048020-0 Knob Core 1

F009 70-048013-0 Power Button 1

F010 87-048002-0 Button pad 9 S024 86-004002-0

F011 76-008001-0 LED Lens 1

F012 70-048012-1 Input Button 9 P01 70-043001-0 HEATSINK 03 8

F013 92-048001-0 Spring for Button 10

S023

40405-063-0404Spring Washer M4 1

Washers GB97-87 8

Spring Washers GB93 6

Washer  3X1

FP01 23-30202-00 VFD 1

PACKING PART LIST

REF.NO PART NO. DESCRIPTION Qty.

T001 67-043001-0 Top Cover 1

T002 76-046001-0 Screw W asher 4

T003 xx-xxxxxx-x Insulation sheet 1

R001 67-043004-1

R002 01-51502-00 AUD Board 1

R003 01-51505-20

R004 01-51504-00 CSS Board 1 30-45150-12 Instruction Manual 2 1

R005 00-51501-20

R006 67-043005-0 VID Bracket 1

R007 75-043003-0 PCB Spacer 2

R008 17-07002-12 AC-Output(AH only) 1

17-07002-20 AC-Output(C only) 1

R009 17-07003-03 AC Inlet 1 15-17251-20 AC cord ( C ) 1

R010 11-01101-03 Rocker Switch 1 15-17121-10 AC cord (AH) 1

S001 61-024108-0 Self Taping Screws STB4X8 4

S002 61-023108-0 Self Taping Screws STB3X8 16

S003 61-373506-0 Self Taping Screws M3X6 8

S004 62-010802-0 Nuts GB6170, M8 1

S005 63-020820-1

Rear Pane C

Multifunctional Board C

VID Board  C

Spring Washers GB93 8

P001

P002

P003

P004

P005

1 30-45150-11 Instruction Manual 1 1

P006

1 30-45150-03 Instruction Manual (Chinese) 1

P007

P008

P009 HTRM

P010

P011

P015

P016

P012

P013

P014

88-043001-0 shipping box 1

88-043002-0 Gift box 1

89-043001-1 Polyfoam -Bottom 1

89-043002-1 Polyfoam-Cap 1

87-043003-0 Accessories box 1

89-043004-0 Accessories box polyfoam (A) 1

30-28601-00 Batteries 1

Remote control (HTRM) NSP 1

88-043004-0 Box sheet 1

15-86221-00 AC cord (BC) 1

87-043003-0 Non-woven bag 1

90-005001-0 Polybag 1

89-043003-0 Accessories box polyfoam (B) 1

30-11501-00 Remote control (ZR2) 1

30-25150-00 Batteries AA 4

2-4

SECTION 3

ELECTRICAL CONTENTS

ELECTRICAL TROUBLESHOOTING GUIDE……………………………….3-2

1. Power check flow……………………………………………………………………….3-2,3

DETAILS AND WAVERORMS ON SYSTEM TEST AND DEBUGGING….3-4

1.DSP clock 20MHz;Volume control STB, DATA and CLOCK…………………………3-4

2.AT89C51 reset is high active;WM8740 DAC STB,DATA and CLOCK……………...3-5

BLOCK DIAGRAMS…………………………………………………………….

1. Digital section…………………………………………………………………………...3-6

2. Analog input section……………………………………………………………………3-7

3. Volume and EXT.section/L/R/C/SW…………………………………………………..3-8

4. Volume and EXT.section/SL/SR/SBL/SBR…………………………………………..3-9

5. Component video………………………………………………………………………3-10

6. S video section…………………………………………………………………………3-11

7. Composite video……………………………………………………………………….3-12

3-6

WIRING DIAGRAM…………………………………………………………….3-13

1.Wiring diagram……………………………………………………………….3-13

CIRCUIT DIAGRAMS…………………………………………………………3-14

1. Power supply circuit diagram………………………………………………………..3-14

2. Front panel circuit diagram…………………………………………………………..3-15

3. HDMI circuit diagram…………………………………………………………………3-16

4. CSS circuit diagram…………………………………………………………………..3-17

5. Audio circuit diagram…………………………………………………………………3-18,19,20

6. Video circuit diagram…………………………………………………………………3-21,22,23

PRINTED CIRCUIT DIAGRAM…………………………………………………….3-24

1. PSU board…………………………………………………………………………….3-24

2. FPP board……………………………………………………………………………..3-25

3. HDMI board……………………………………………………………………………3-26

4. CSS board……………………………………………………………………………..3-27

5. Audio board……………………………………………………………………………3-28

6. Video board……………………………………………………………………………3-29

3-1

ELECTRICAL TROUBLESHOOTING GUIDE

Power check flow

Power switch on

Amber LED

ON?

5vs is Right?

Check CON602 Check U611 Check D605 Check F609

Yes

Press the standby button

Blue LED ON?

Yes

12vt power

supply is correct?

Yes

Check Q312 , U302,U301 on FPP board

Check Q303 , U302,U301 on FPP board Check U304 Check D608,F608

Check U304 Check D608,F608

-15Va,15Va power supply is correct?

Yes

Q614 Base pole

is oV?

Yes

Check Q614 collector is 0v? Check U606 Check D603 Check F603,F604 Check Q615,Q611,Q610 Check U607

3-2

Check Q311,U301,U302

Yes

5Vd power

supply is correct?

Yes

10vv,-5vv power

supply is correct?

Yes

8vd power supply

is correct?

Check U608 input supply Check Q616,Q617 Check D604,F606

Check U603 input supply Check Q686,Q684,Q682 Check D683,F681,F682

Check U604 input supply Check Q609,Q607 Check D681,F605

Yes

End

3-3

DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING



1.DSP clock 20MHz

2.Volume control STB(CH1) , DATA(CH2) and CLOCK(CH3)

3-4



3.AT89C51 RESET IS HIGH ACTIVE,STB(CH1),+5V(CH2)

4.WM8740 DAC STB(CH1) , DATA(CH2) AND CLOCK(CH3)

3-5

BLOCK DIAGRAM

1.Digital Section

Digital Input

Input Transformer

T1000(12:18)

Coaxial Input1

Input Transformer

T1001(12:18)

Coaxial Input2

Input Transformer

T1002(12:18)

Coaxial Input3

Input Transformer

T1003(12:18)

Coaxial Input4

Input Selector

U1006(AK4114VQ)

From ADC

SPDIF

U1006(AK4114VQ)

SPDIF&HDMI Selector

U1032(74VHC244)

HDMI is not

active d in th is version

Decoder DSP

U1018(DSPD56367)

Decode: Dolb y Digit al(D.D ) Dolby PL2 Moive Dolby PL2X D.D EX DTS DTS-ES Matrix 6.1 DTS-ES Discrete 6.1 DTS NEO:6 Cinema DTS NEO:6 Music Other Mode

RAM

U1032(74VHC244)

Process DSP

U1900(DSPB56367)

THX Bass Management Delay

RAM

U1032(74VHC244)

Buffer

U1031(74ACT541)

SPDIF MCK

Local MCK

HDMI MCK

Buffer

U1033(74AC04)

Buffer

U1033(74AC04)

Buffer

U2047(74AC541)

MCK Selector

U2042(74AC153)

HDMI is not

active d in th is version

Output Transformer

T1004(18:4)

Coaxial Output1

Output Transformer

T1005(18:4)

Coaxial Output2

Buffer

U1033(74AC04)

Optical Output1

Buffer

U1033(74AC04)

Optical Output2

DAC

U2055(WM8740)

to L/R DAC LPF

DAC

U2056(WM8740)

to C/SW DAC LPF

DAC

U2057(WM8740)

to SL/SR DAC LPF

Optical Input1

Optical Input2

Optical Input3

Optical Input4

DAC

U2058(WM8740)

to SBL/SBR DAC LPF

3-6

2.Analog Input Section

Analog Input

0dB(200mVrms)

DVD

SAT

VCR

Video4

Input Selector

U2030-2031(TC9274F-001)

If select Digital input as

"NONE" on OSD Menu, this signal will go through DSP. Butitis noteffect to VCR, Video4 and Tape output

Tape Monitor Selector

U2030-2031(TC9274F-001)

Buffer

U2008(OPA2134)

Buffer

U2005(OPA2134)

0dB

0dB, -3dB, -6dB Attenuation

Q2008-2011(SC3326)

Select by OSD

ADC Input LPF(85KHz 2rd)

U2006-2007(OPA2134)

Mute

Q2013, Q2016(SC3326)

If select VCR

as Input,

0dB

disable the output

Mute

Q2014, Q2017(SC3326)

If select

Video4as Input, disable the output

Mute

Q2012, Q2015(SC3326)

If select Tape

as Input, disable the output

ADC

U2041(AK5394A)

0dBfs=-1.4dB

Bd5.1-Bd0Bd0

Attenuation

R2191, R2194(2K)

0dB

Attenuation

R2192, R2195(2K)

0dB

Attenuation

R2193, R2196(2K)

0dB

If load is

10Kohms, attenuation is

1.5dB

If load is

10Kohms, attenuation is

1.5dB

If load is

10Kohms, attenuation is

1.5dB

V3 Analog Output

-1.5dB

V4 Analog Output

0dB

-1.5dB

Tape Analog Output

Bd0Bd0

-1.5dB

To SPDIF

-20.1dBfs

Video5

Video6

DISC

Tuner

Tape

MS Selector

U2030-2031(TC9274F-001)

Can be selected by MS

remote, use "LOCA L" buttononMSremotemay switch Main select and local select

If use MSoutput, the user

need connect analog audio to analog audio input

Buffer

U2009(OPA2134)

0dB

Volume

U2036(WM8816)

Output Buffer

U2010(OPA4134)

Bd0Bd0

Mute

Q2018-Q2021(SC3326)

Attenuation

R2226, R2227(220R) etc.

If load is

10Kohms,

0dB0dB

attenuation is

0.5dB

MS Analog Output

-0.5dB

3-7

+ 42 hidden pages