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6-4.
TUNER,
AUDIO
SECTION
SCHEMATIC
DIAGRAM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
e
ic
i
.
Block Diagram
1C1
CXA1238S
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hy
AY
—
3
=
2
"
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to
een
FM IF/
°
=
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a
vco
'
ISCRI.
3
s
a
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Cc
"
"
>
8
SLR-34VR
-
5
8
8
FM STEREO
I
FM/AM FRONT-END,
o
°
[ FM STEREO |
ry coun eR oO
<|
pe
- O E M O D E
st
TCU
1/2
COUNTER
(°02)
TUNING
La
INDIC ATOR
BAND PASS
MUTE
FE QUT
NO
RF IN
FM RF
AFC
;
AM OSCMUTE
FM ®ISCRI
MPX REG
GNB
ee
1.25V
vco
PLL
LPF
D
1
BAND
IF, DET
U
VGQ
CHECK
_LP
|
|
SELECT
AM
IF
IN
FM
IF
IN
TUNING
GND
AGC: AFC
St oN
P tor DET
PLL
LPF
]
|
Note on Schematic Diagram:
e@
All capacitors are in uF unless otherwise noted.
pF: MMF
7
SOWV
or
fess are
not
indicated
except
for electrolytics
and tantalums.
®
All
resistors are in 2 and
'/,W or less unless otherwise
specified.
I
e
fF : fusible resistor.
©
F
I
: adjustment for repair.
Voltage
and
waveforms
are
dc
with
respect
te ground
FE
under nosignal
(detuned) conditions.
Radio section
no mark:
FM
Ooo
Tr
Ce
I
OF
R222
12k
R122
12k
anS+
3.
]
tion tolerances,
uo.
CNP30S
e
Waveforms are taken with a oscilloscope.
L304
¢
baw
Lo
GHA
Se
|
i
R331
4.7k
R123
2, 2k
|
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Ri25 12k
a
mo
uo
R226
15k R124
i5k
R223
2.2k
<
1
: <
ix)
eg
0
\
Lz
Fol L
OCH
Voltage
variations
may
be
noted
due ta normal
produc-
tion tolerances.
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