NAD C 425, Service Manual

Page: 6 / 32

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AM LOOP
ANT
FM
ANT
OUTPUT
FRONT
END
ENV172D3G1
VFD
CPU
LC866448B
U201 U202
VFD DRIVER
PT631
1
KEY
MA
TRIX
Trigger IN
U203
EEPROM
24C08
PLL
LC72723M
RDS DECODER
U901
AM/FM IF
LA1837
MUTING
IR IN U701 74HC86
M218 REMOTE SENSOR
POWER SUPPL
Y
VFD
-VP
+5V CPU
+10V
AC INPUT
L
R
VT VT
ce
data
clk
RDS-CLK
RDS-SIG
RDS-DA
TA
MPXIN
data out
(#1)=Power On (#1)+(#2)=Standby
LC7218
U903
ST/MO, MUTE, SMETER
TUNE
FM
OSC/IF
AM
OSC/IF
1
27
17 16
23
2
30
U902
21
2
3
4
5
15
11 15
8
10 IN
16
14
20
16 14 22
12/13
5
16
19
24
19
18
BLOCK DIAGRAM