NAD M15 C/AH, Service Manual

Page: 18 / 60

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
B d 0 B d 0
B d 0 B d 0
0dB
-0.5dB
B d 5 . 1 - B d 0 B d 0
-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. But it is not effect
to VCR, Video4 and Tape
output
Can be selected by MS
remote, use "LOCAL"
button on MS remote may
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
0dB 0dB
If load is
10Kohms,
attenuation is
0.5dB
3-7