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4-3. SCHEMATIC DIAGRAM
– 15 –
– 16 –
r
IC BLOCK DIAGRAM
IC1 TA8122AF
24
23
AM
RF
FM
RF
1
2
Note:
• 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
specified.
•
¢
: internal component.
•
: B+ Line.
•
: adjustment for repair.
• Power voltage is dc 3V and fed with regulated dc power
supply from external power voltage jack (J301).
• Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark : FM
(
) : AM
<
> : PLAY
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production
tolerances.
• Signal path.
: FM
: PB
– 17 –
WM-PA1
22
21
20
19
18
17
16
15
14
13
FM
AM
PRE
PHASE
PHASE
STEREO
VCO
OSC
OSC
COM
COM
DECODER
AF
AM
AM
FM/AM
FREQ.
HYS
SW
MIX
DET
MONO SW
DIVIDER
FM
DET
FM
AM
AM
L
TU
ST
FM
MIX
AGC
IF
LED
LED
DET
IF
3
4
5
6
7
8
9
10
11
12
1
/
4
W or less unless otherwise
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