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5-4. SCHEMATIC DIAGRAM (MAIN SECTION)
– 15 –
– 16 –
WM-FS473
r
WAVEFORMS
1
2
2.8Vp-p
4.1Vp-p
0.38 µ sec
0.38 µ sec
VOLT/DIV : 1V AC
VOLT/DIV : 0.5V AC
TIME/DIV : 0.1 µsec
TIME/DIV : 0.1 µsec
r
IC BLOCK DIAGRAM
IC1 TA2137FN (EL)
24
23
22
21
20
19
18
17
16
15
14
IF
AM
AF
RED
OSC
ST
SW
FM
AF
OSC
BUFF
VCO
BUFF
DIVIDE
IF
BUFF
BUFF
LEVEL
1/8
DET
AM
FM
ST/MO
DET
DET
FM/AM
AM
MAX
FM
AGC
FM
AMIF
FMIF
MUTE
RF
MAX
1
3
4
5
6
7
8
9
10
11
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
1
/
W or less unless otherwise
4
specified.
•
: internal component.
¢
• C : panel designation.
• U : B+ Line.
• H : adjustment for repair.
• Power voltage is dc 3 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.
• Voltages and waveforms are dc with respect to ground in
playback mode.
no mark : FM (RADIO SECTION)
PLAY (TAPE SECTION)
(
) : AM
• Voltages are taken with a VOM (Input impedance 10 MΩ).
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.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
E
: PB
– 17 –
13
DECOOE
12
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