– 15 – – 17 –– 16 –
5-4. SCHEMATIC DIAGRAM (MAIN SECTION)
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
/
4
W or less unless otherwise
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
r
WAVEFORMS
1
VOLT/DIV : 1V AC
TIME/DIV : 0.1 µsec
2
VOLT/DIV : 0.5V AC
TIME/DIV : 0.1 µsec
4.1Vp-
0.38
sec
2.8Vp-p
0.38
µ
sec
r
IC BLOCK DIAGRAM
IC1 TA2137FN (EL)
21222324
2
3
5
4
6
7
8
9
10
1
11
12
13
14
15
16
17
181920
FM
OSC
AM
OSC
BUFF
IF
BUFF
AF
BUFF
BUFF
AM
MAX
FM
MAX
FM
RF
ST
LEVEL
DET
1/8
AMIF
FMIF
AGC
SW
IF
RED
AM
DET
FM
DET
AF
ST/MO
FM/AM
MUTE
VCO
DIVIDE
DECOOE
FM RF OUT
RF VCC
AM RF IN
FM OSC
AM OSC
OSC OUT
ST LED
IF REQ
DET OUT
DET IN
LPF1
LPF2
RF GND
FM RF IN
AM LOW CUT
MIX OUT
VCC
AM IF IN
FM IF IN
GND
AGC
OUAD
R-OUT
L-OUT
WM-FS473
To Next Page
Loading...
