Analog Input Section - NAD M15 C/AH Service Manual

2.Analog Input Section

Analog Input
Input Selector
U2030-2031(TC9274F-001)
0dB(200mVrms)
DVD
If select Digital input as
"NONE" on OSD Menu,
this signal will go through
DSP. But it is not effect
SAT
to VCR, Video4 and Tape
output
VCR
Video4
Video5
Video6
MS Selector
CD
U2030-2031(TC9274F-001)
DISC
Can be selected by MS
remote, use "LOCAL"
button on MS remote may
switch Main select and
Tuner
local select
If use MS output, the user
need connect analog audio
Tape
to analog audio input
Buffer
U2008(OPA2134)
0dB
Tape Monitor Selector
U2030-2031(TC9274F-001)
Buffer 0dB, -3dB, -6dB Attenuation
U2005(OPA2134) Q2008-2011(SC3326)
0dB 0 d B
Volume
U2036(WM8816)
Buffer
U2009(OPA2134)
0dB 0 d B
Mute
Q2013, Q2016(SC3326)
If select VCR
as Input,
0dB
disable the
output
Mute
Q2014, Q2017(SC3326)
If select
Video4 as
Input, disable
the output
Mute
Q2012, Q2015(SC3326)
If select Tape
as Input,
0 d B
disable the
output
ADC Input LPF(85KHz 2rd) ADC
U2006-2007(OPA2134) U2041(AK5394A)
Select by OSD 0dBfs=-1.4dB
Menu
0 d B 1 - 5 . d B
Output Buffer Mute
U2010(OPA4134) Q2018-Q2021(SC3326)
0 d B 0dB
3-7
Attenuation
R2191, R2194(2K)
V3 Analog Output
If load is
10Kohms,
0dB
-1.5dB
attenuation is
1.5dB
Attenuation
R2192, R2195(2K)
V4 Analog Output
If load is
10Kohms,
0dB 0dB
-1.5dB
attenuation is
1.5dB
Attenuation
R2193, R2196(2K)
Tape Analog Output
If load is
10Kohms,
0dB 0 d B
-1.5dB
attenuation is
1.5dB
To SPDIF
-20.1dBfs
Attenuation
R2226, R2227(220R) etc.
MS Analog Output
If load is
10Kohms,
0dB
-0.5dB
attenuation is
0.5dB