NAD M15 C/AH User manual

SERVICE MANUAL
SERVICE MANUAL
M15 C/AH

02'(/ 06(59,&(0$18$/
© NAD 2007
NAD ELECTRONICS INTERNATIONAL
TORONTO

M15 C/AH
SOUND PREAMPLIFIER
SOUND PREAMPLIFIER
SURROUND
SURROUND
M15 C/AH
SURROUND
SOUND PREAMPLIFIER

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 ............. 1-2
SERVICING PRECAUTIONS ........................................................................... 1-3
• General Servicing Precautions
• Insulation Checking Prodedure
• Electrostatically Sensitive Devices
1-1
ADJUSTMENT PROCEDURE .............................................................................
SPECIFICATIONS ........................................................................................... 1-5
1-4
• OSD VCO Oscillation Frequency (VIDEO BOARD)

1-2
SUBJECT: GRAPHIC SYMBOLS
PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO PRODUCTS
A.C. VOLTMETER
GOOD EARTH GROUND
SUCH AS THE WATER
PIPE. CONDUIT. ETC
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
CAUTION : DO NOT ATTEMPT TO MODIFY THIS
PRODUCT IN ANY WAY, NEVER PERFORM CUSTOM-
IZED INSTALLATIONS WITHOUT MANUFACTURER’S
APPROVAL. UNAUTHORIZED MODIFICATIONS WILL
NOT ONLY VOID THE WARRANTY, BUT MAY LEAD TO
YOUR BEING LIABLE FOR ANY RESULTING PROP-
ERTY DAMAGE OR USER INJURY.
SERVICE WORK SHOULD BE PERFORMED ONLY
AFTER YOU ARE THOROUGHLY FAMILIAR WITH ALL
OF THE FOLLOWING SAFETY CHECKS AND SERVIC-
ING GUIDELINES. TO DO OTHERWISE,INCREASES
THE RISK OF POTENTIAL HAZARDS AND INJURY TO
THE USER.
WHILE SERVICING, USE AN ISOLATION TRANS-
FORMER 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 ESPE-
CIALLY IMPORTANT ON THOSE MODULES WHICH
ARE TRANSPORTED TO AND FROM THE REPAIR
SHOP.
2. NEVER RELEASE A REPAIR UNLESS ALL PROTEC-
TIVE DEVICES SUCH AS INSULATORS, BARRIERS,
COVERS, SHIELDS, STRAIN RELIEFS, POWER
SUPPLY CORDS, AND OTHER HARDWARE HAVE-
BEEN REINSTALLED PER ORIGINAL DESIGN. BE
SURE THAT THE SAFETY PURPOSE OF THE POLAR-
IZED LINE PLUG HAS NOT BEEN DEFEATED.
3. SOLDERING MUST BE INSPECTED TO DISCOVER
POSSIBLE COLD SOLDER JOINTS, SOLDER
SPLASHES OR SHARP SOLDER POINTS. BE CER-
TAIN 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 UNRECOM-
MENDED CIRCUIT MODIFICATIONS.
7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PER-
FORM 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 TRANS-
FORMER DURING THIS TEST USE AN A.C. VOLTME-
TER, HAVING 5000 OHMS PER VOLT OR MORE SEN-
SITIVITY, 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. VOLT-
AGE ACROSS THE COMBINATION OF 1500OHM
RESISTOR AND .15 MFD CAPACITOR. REVERSE THE
A.C. PLUG AND REPEAT A.C. VOLTAGE MEASURE-
MENTS FOR EACH EXPOSED METALLIC PART. VOLT-
AGE 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 COR-
RECTED IMMEDIATELY.
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.

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.
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.
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.
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.
1-4
C1162
VIDEO BOARD
SOFTWARE VERSION:
TO DISPLAY SOFTWARE VERSIONS, PRESS FRONT PANEL video & audio SIMULTANEOUSLY

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
CenterDialog ±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)
NetWeight 15lbs
ShippingWeight 20lbs
1-5

2-1
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
EXPLODED VIEWS.................................................................................. 2-2
1. Cabinet and main frame section...................................................................2-2
2. Packing accessory section............................................................................. 2-3
3. Exploded view parts list................................................................................. 2-4

S002
P01
(1:2)
S019
F001
F003
F004
FP01
F006
F005
F007
F008
F011
F009
F012
F010
F013
F002
C001 C002
C003
C007
C006
C005
C004
S009
T001
R001
R002
R004
R005
S001
S017
S002
S012
S010
S014
S015
S016
S003
S011
S003
S013
S015 S020
S018
S019
S008
S007
S013
R003
S013
S012
C008
C005
S006
S005 S004
T002
S003
S013
R006
R007
S021
S022 S023
R008
R009
R010
EXPLODEDVIEW
1.Cabinet and mainframesection
2-2
NOTE: S009, S004, S005, S006, C004, C005, C006,
C007, & C008 are sold as one part number; 18-51512-00
T003

P001
P002
P003
P004
P005
P007
P008
P009
P010
P013
P012
P014
P015
P016
P006
P011
2.Packing accessory section
2-3

REF.NO PART NO. DESCRIPTION Qty. REF.NO PART NO. DESCRIPTION Qty.
C001 67-043002-0 Chassis 1 S006 63-010816-0 Washers GB97-8781
C002 83-048010-0 Foot Assy 4 S007 63-020616-0 Spring Washers GB9364
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 40405-063-0404Spring W asher M4 1
F009 70-048013-0 Power Button 1
F010 87-048002-0 Button pad 9 S024 86-004002-0 Washer 3X1 4
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
FP01 23-30202-00 VFD 1
REF.NO PART NO. DESCRIPTION Qty.
T001 67-043001-0 Top Cover 1 P001 88-043001-0 shipping box 1
T002 76-046001-0 Screw Washer 4 P002 88-043002-0 Gift box 1
P003 89-043001-1 Polyfoam -Bottom 1
R001 67-043004-1 Rear PaneC1P004 89-043002-1 Polyfoam-Cap 1
R002 01-51502-00 AUD Board 1 P005 87-043003-0 Accessories box 1
R003 01-51505-20 Multifunctional BoardC1 30-45150-11 Instruction Manual 1 1
R004 01-51504-00 CSS Board 1 30-45150-12 Instruction Manual 2 1
R005 00-51501-20 VID Board C1 30-45150-03 Instruction Manual (Chinese) 1
R006 67-043005-0 VID Bracket 1 P007 89-043004-0 Accessories box polyfoam (A) 1
R007 75-043003-0 PCB Spacer 2 P008 30-28601-00 Batteries 1
R008 17-07002-12 AC-Output(AH only) 1 P009 HTRM Remote control (HTRM)NSP 1
17-07002-20 AC-Output(C only) 1 P010 88-043004-0 Box sheet 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
15-86221-00 AC cord (BC) 1
S001 61-024108-0 Self Taping Screws STB4X8 4 P015 87-043003-0 Non-woven bag 1
S002 61-023108-0 Self Taping Screws STB3X8 16 P016 90-005001-0 Polybag 1
S003 61-373506-0 Self Taping Screws M3X6 8 P012 89-043003-0 Accessories box polyfoam (B) 1
S004 62-010802-0 Nuts GB6170, M8 1 P013 30-11501-00 Remote control (ZR2) 1
S005 63-020820-1 Spring Washers GB9381P014 30-25150-00 Batteries AA 4
PACKING PART LIST
P006
P011
3. EXPLODED VIEW PARTS LIST
S023
!
2-4
!
!
!
!!
T003 xx-xxxxxx-x Insulation sheet 1

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…………………………………………………………….3-6
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
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

Power switch on
Power check flow
Press the standby button
Check CON602
Check U611
Check D605
Check F609
No
No
Yes
Amber LED
ON? 5vs is Right?
No
Check Q312 , U302,U301 on
FPP board
Yes
Blue LED ON?
No Check Q303 , U302,U301 on
FPP board
Check U304
Check D608,F608
Yes
12vt power
supply is correct?
-15Va,15Va power
supply is correct?
Yes
Check U304
Check D608,F608
No Q614 Base pole
is oV?
No Check Q311,U301,U302
Yes
Check Q614 collector is 0v?
Check U606
Check D603
Check F603,F604
Check Q615,Q611,Q610
Check U607
Yes
A
ELECTRICAL TROUBLESHOOTING GUIDE
3-2

A
Yes
5Vd power
supply is correct?
No Check U608 input supply
Check Q616,Q617
Check D604,F606
10vv,-5vv power
supply is correct?
No Check U603 input supply
Check Q686,Q684,Q682
Check D683,F681,F682
8vd power supply
is correct?
No Check U604 input supply
Check Q609,Q607
Check D681,F605
End
Yes
Yes
Yes
3-3


1.DSP clock 20MHz
2.Volume control STB(CH1) , DATA(CH2) and CLOCK(CH3)
3-4
DETAILS AND WAVEFORMS ON SYSTEM TEST
AND DEBUGGING


3.AT89C51 RESET IS HIGH ACTIVE,STB(CH1),+5V(CH2)
3-5
4.WM8740 DAC STB(CH1) , DATA(CH2) AND CLOCK(CH3)

Input Selector
U1006(AK4114VQ)
1.Digital Section
Digital Input
Buffer
U1031(74ACT541)
Optical Output2
Optical Output1
Coaxial Output2
Coaxial Input1
SPDIF
U1006(AK4114VQ)
SPDIF&HDMI Selector
U1032(74VHC244) Decode:
Dolby Digital(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
Coaxial Input2
Coaxial Input3
Coaxial Input4
Optical Input1
Optical Input2
Optical Input3
Optical Input4
From ADC
Buffer
U1033(74AC04)
Buffer
U1033(74AC04)
Output Transformer
T1004(18:4)
Input Transformer
T1000(12:18)
Input Transformer
T1001(12:18)
Input Transformer
T1002(12:18)
Input Transformer
T1003(12:18)
Buffer
U1033(74AC04)
Buffer
U1033(74AC04)
Output Transformer
T1005(18:4)
Coaxial Output1
Decoder DSP
U1018(DSPD56367)
HDMI is not
actived in this
version
THX
Bass Management
Delay
Process DSP
U1900(DSPB56367)
Buffer
U2047(74AC541)
RAM
U1032(74VHC244) RAM U1032(74VHC244)
DAC
U2055(WM8740)
DAC
U2056(WM8740)
DAC
U2057(WM8740)
DAC
U2058(WM8740)
to L/R DAC LPF
to C/SW DAC LPF
to SL/SR DAC LPF
to SBL/SBR DAC LPF
MCK Selector
U2042(74AC153)
HDMI is not
actived in this
version
SPDIF MCK
HDMI MCK
Local MCK
3-6
BLOCK DIAGRAM

Input Selector
U2030-2031(TC9274F-001)
2.Analog Input Section
Analog Input
ADC Input LPF(85KHz 2rd)
U2006-2007(OPA2134)
0dB, -3dB, -6dB Attenuation
Q2008-2011(SC3326)
To SPDIF
ADC
U2041(AK5394A)
Output Buffer
U2010(OPA4134)
Volume
U2036(WM8816)
MS Analog Output
Tape Analog Output
V4 Analog Output
0dB(200mVrms)
0dB
Bd0Bd0
Bd0Bd0
0dB
-0.5dB
Bd5.1-Bd0Bd0
-1.5dB
-1.5dB
V3 Analog Output
Buffer
U2008(OPA2134)
0dB
0dB
-1.5dB
MS Selector
U2030-2031(TC9274F-001)
DVD
SAT
VCR
Video4
Video5
Video6
CD
DISC
Tuner
Tape
Tape Monitor Selector
U2030-2031(TC9274F-001)
Buffer
U2005(OPA2134)
Mute
Q2012, Q2015(SC3326)
Select by OSD
Menu
If select Tape
as Input,
disable the
output
If select
Video4 as
Input, disable
the output
If select VCR
as Input,
disable the
output
Mute
Q2014, Q2017(SC3326)
Mute
Q2013, Q2016(SC3326)
0dBfs=-1.4dB
-20.1dBfs
If select Digital input as
"NONE" on OSD Menu,
this signal will go through
DSP.Butitisnoteffect
to VCR, Video4 and Tape
output
Can be selected by MS
remote, use "LOCAL"
buttononMSremotemay
switch Main select and
local select
If use MS output, the user
need connect analog audio
to analog audio input
0dB
Buffer
U2009(OPA2134)
Mute
Q2018-Q2021(SC3326)
0dB
Attenuation
R2193, R2196(2K)
If load is
10Kohms,
attenuation is
1.5dB
If load is
10Kohms,
attenuation is
1.5dB
If load is
10Kohms,
attenuation is
1.5dB
Attenuation
R2192, R2195(2K)
Attenuation
R2191, R2194(2K)
Attenuation
R2226, R2227(220R) etc.
0dB
0dB
0dB0dB
If load is
10Kohms,
attenuation is
0.5dB
3-7

3.Volume and EXT. Section/L/R/C/SW
L EXT. Input
Buffer
U2011(OPA4134)
Output Buffer
U2025(OPA4134)
Volume
U2037(WM8816)
Main L Output
13dBr(DAC) 0.5dBr 0dBr(150mVrms)
Muti-Source Selector
U2059(TC9274N-008)
2.5dBr(EXT)
Buffer
U2021(OPA2134)
Mute
Q2022, Q2023(SC3326)
Attenuation
R2230, R2231(220R), R2205(47R)
0.5dBr
0.5dBr
If load is
10Kohms,
attenuation is
0.5dB
DAC LPF(55KHz 2rd Butterworth with 16.5dB gain)
U2013(OPA2134)
)rBd5.2(Bd0)smrVm002(Bd0
From DAC L
-20dBfs
13dBr
is -32dBfs if
without "SW"
13dBr(DAC)
2.5dBr(EXT)
Reduce 12.5dB if input
from DAC and Compensat
e
gain if DAC output is
changed
Reduce 4dB if DIALNORM
is 27
Reduce 2dB if input from
EXT.
R EXT. Input
Buffer
U2011(OPA4134)
Output Buffer
U2025(OPA4134)
Volume
U2037(WM8816)
Main R Output
13dBr(DAC) 0.5dBr 0dBr(150mVrms)
Muti-Source Selector
U2059(TC9274N-008)
2.5dBr(EXT)
Buffer
U2021(OPA2134)
Mute
Q2024, Q2025(SC3326)
Attenuation
R2232, R2233(220R), R2206(47R)
0.5dBr
0.5dBr
If load is
10Kohms,
attenuation is
0.5dB
DAC LPF(55KHz 2rd Butterworth with 16.5dB gain)
U2014(OPA2134)
)rBd5.2(Bd0)smrVm002(Bd0
From DAC R
-20dBfs
13dBr
is -32dBfs if
without "SW"
13dBr(DAC)
2.5dBr(EXT)
Reduce 12.5dB if input
from DAC and Compensat
e
gain if DAC output is
changed
Reduce 4dB if DIALNORM
is 27
Reduce 2dB if input from
EXT.
CEXT.Input
Buffer
U2012(OPA4134)
Output Buffer
U2026(OPA4134)
Volume
U2038(WM8816)
Main C Output
13dBr(DAC) 0.5dBr 0dBr(150mVrms)
Muti-Source Selector
U2059(TC9274N-008)
2.5dBr(EXT)
Buffer
U2024(OPA2134)
Mute
Q2026, Q2027(SC3326)
Attenuation
R2234, R2235(220R), R2207(47R)
0.5dBr
0.5dBr
If load is
10Kohms,
attenuation is
0.5dB
DAC LPF(55KHz 2rd Butterworth with 16.5dB gain)
U2015(OPA2134)
)rBd5.2(Bd0)smrVm002(Bd0
From DAC C
-20dBfs
13dBr
is -23dBfs if
mode is PL2 o
r
PL2X or
NEO:6
13dBr(DAC)
2.5dBr(EXT)
Reduce 12.5dB if input
from DAC and Compensat
e
gain if DAC output is
changed
Reduce 4dB if DIALNORM
is 27
Reduce 2dB if input from
EXT.
SW EXT. Input
Buffer
U2012(OPA4134)
LPF(1KHz 1st)
U2026(OPA4134)
Volume
U2038(WM8816)
Main SW Output
13dBr(DAC) 10.5dBr 10dBr(150mVrms)
Muti-Source Selector
U2059(TC9274N-008)
12.5dBr(EXT)
Buffer
U2024(OPA2134)
Mute
Q2028, Q2029(SC3326)
Attenuation
R2236, R2237(220R), R2208(47R)
10.5dBr10.5dBr
If load is
10Kohms,
attenuation is
0.5dB
DAC LPF(55KHz 2rd Butterworth with 16.5dB gain)
U2016(OPA2134)
)rBd5.21(Bd01)smrVm236(Bd01
From DAC SW
-20dBfs
13dBr
is -36dBfs if
all are "small"
13dBr(DAC)
12.5dBr(EXT)
Reduce 2.5dB if input from
DAC and Compensate gain
if DAC output is changed
Reduce 4dB if DIALNORM
is 27
Reduce 2dB if input from
EXT.
3-8

4.Volume and EXT. Section/SL/SR/SBL/SBR
SL EXT. Input
Buffer
U2011(OPA4134)
Output Buffer
U2027(OPA4134)
Volume
U2039(WM8816)
Main SL Output
13dBr(DAC) 0.5dBr 0dBr(150mVrms)
Muti-Source Selector
U2059(TC9274N-008)
2.5dBr(EXT)
Buffer
U2022(OPA2134)
Mute
Q2030, Q2031(SC3326)
Attenuation
R2238, R2239(220R), R2209(47R)
0.5dBr
0.5dBr
If load is
10Kohms,
attenuation is
0.5dB
DAC LPF(55KHz 2rd Butterworth with 16.5dB gain)
U2017(OPA2134)
)rBd5.2(Bd0)smrVm002(Bd0
From DAC SL
-20dBfs
13dBr
is -23dBfs if
Surround is
"single" or
mode is
NEO:6
13dBr(DAC)
2.5dBr(EXT)
Reduce 12.5dB if input
from DAC and Compensat
e
gain if DAC output is
changed
Reduce 4dB if DIALNORM
is 27
Reduce 2dB if input from
EXT.
SR EXT. Input
Buffer
U2011(OPA4134)
Output Buffer
U2027(OPA4134)
Volume
U2039(WM8816)
Main SR Output
13dBr(DAC) 0.5dBr 0dBr(150mVrms)
Muti-Source Selector
U2059(TC9274N-008)
2.5dBr(EXT)
Buffer
U2022(OPA2134)
Mute
Q2032, Q2033(SC3326)
Attenuation
R2240, R2241(220R), R2210(47R)
0.5dBr0.5dBr
If load is
10Kohms,
attenuation is
0.5dB
DAC LPF(55KHz 2rd Butterworth with 16.5dB gain)
U2018(OPA2134)
)rBd5.2(Bd0)smrVm002(Bd0
From DAC SR
-20dBfs
13dBr
is -23dBfs if
mode is
NEO:6
13dBr(DAC)
2.5dBr(EXT)
Reduce 12.5dB if input
from DAC and Compensat
e
gain if DAC output is
changed
Reduce 4dB if DIALNORM
is 27
Reduce 2dB if input from
EXT.
SBL EXT. Input
Buffer
U2012(OPA4134)
Output Buffer
U2028(OPA4134)
Volume
U2040(WM8816)
Main SBL Output
13dBr(DAC) 0.5dBr 0dBr(150mVrms)
Muti-Source Selector
U2059(TC9274N-008)
2.5dBr(EXT)
Buffer
U2023(OPA2134)
Mute
Q2034, Q2035(SC3326)
Attenuation
R2242, R2243(220R), R2211(47R)
0.5dBr0.5dBr
If load is
10Kohms,
attenuation is
0.5dB
DAC LPF(55KHz 2rd Butterworth with 16.5dB gain)
U2019(OPA2134)
)rBd5.2(Bd0)smrVm002(Bd0
From DAC SBL
-20dBfs
13dBr
is -23dBfs if
Back surround
is "single" or
mode is
NEO:6 or
DTS5.1 matri
x
13dBr(DAC)
2.5dBr(EXT)
Reduce 12.5dB if input
from DAC and Compensat
e
gain if DAC output is
changed
Reduce 4dB if DIALNORM
is 27
Reduce 2dB if input from
EXT.
SBR EXT. Input
Buffer
U2012(OPA4134)
Output Buffer
U2028(OPA4134)
Volume
U2040(WM8816)
Main SBR Output
13dBr(DAC) 0.5dBr 0dBr(150mVrms)
Muti-Source Selector
U2059(TC9274N-008)
2.5dBr(EXT)
Buffer
U2023(OPA2134)
Mute
Q2036, Q2037(SC3326)
Attenuation
R2244, R2245(220R), R2212(47R)
0.5dBr
0.5dBr
If load is
10Kohms,
attenuation is
0.5dB
DAC LPF(55KHz 2rd Butterworth with 16.5dB gain)
U2020(OPA2134)
)rBd5.2(Bd0)smrVm002(Bd0
From DAC SBR
-20dBfs
13dBr
is -23dBfs if
mode is
NEO:6 or
DTS5.1 matri
x
13dBr(DAC)
2.5dBr(EXT)
Reduce 12.5dB if input
from DAC and Compensat
e
gain if DAC output is
changed
Reduce 4dB if DIALNORM
is 27
Reduce 2dB if input from
EXT.
3-9