— 8 —
SECTION 4
DIAGRAMS
• IC BLOCK DIAGRAMS
IC1
TA7371AF-EL
IC2
TA2022AFN-EL
IC102 LA4537M
GND
AFC DIODE(A)
RF IN
OFC DIODE(C)
MIX OUT
VCC
OSC
RF OUT
1
2
3
4
5
6
7
8
RF
REG
MIX
OSC
VREF
OSC
VCC
GND
IF OUT
IF REQ
SP
OUT
1
2
FM IF IN
MIX
3
4
5
AM IF IN
QUAD
AGC
6
7
8
9
10
11
12
ROUT
LOUT
ST
IND
13
14
15
MPX IN
PILOT IN
DET OUT
IN SW
AM RF IN
20
21
22
23
24
LPF 2A
LPF 2B
18
19
LPF1
VCO
16
17
STOP
PULSE
OSC
AGC
MIX
FM
IF
FM
IF
AM
IF
AM
IF
FM DET
SWITCH
AM DET
DEVIDE
DECODE
PRE
VCO
0
90
FM
AM
PILOT
ST
IND
ø
ø
POWER
SWITCH
MUTE
BIAS
AMP
AMP
1
2
3
4
5
6
7
8
9
10 MUTE
R-OUT
GND
L-OUT
VCC
PWR
R-IN
GND
L-IN
REG
Note on Printed Wiring Board:
•
X
: parts extracted from the conductor side.
•
a
: Through hole.
•
b
: Pattern from the side which enables seeing.
Caution:
Pattern face side:
Parts on the pattern face side seen from
(SIDE A)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(SIDE B)
the parts face are indicated.
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
C
: panel designation.
•
U
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 1.5 V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
F
: FM
J
: AUDIO IN
• Abbreviation
JE
: Tourist model.