Volume And Ext.section/Sl/Sr/Sbl/Sbr - NAD M15 C/AH Service Manual

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