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WM-FX271FP
Note for 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
/
W or less unless otherwise
4
specified.
•
%
: indicates tolerance.
•
f
: internal component.
• C : panel designation.
• A : B+ Line.
• H : adjustment for repair.
• Total current is measured with no cassette installed.
• Power voltage is dc 3V and fed with regulated dc power
supply from battery terminal.
• Voltage is dc with respect to ground under no-signal
(detuned) condition.
no mark : FM
(
) : AM
<
> : PB
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
F
: FM
f
: AM
E
: PB
• IC Block Diagrams
IC1 TA2111F
24
23 22
FM RF
1
2
3
IC301 LB8115
COM
1
VOLTAGE
RI
2
BIAS
S/S
3
PRE GND
4
PRE OUT1
5
6
PRE NF1
7
PRE OUT2
8
PRE NF2
PRE FWD IN1
9
10
PRE REV IN1
PRE FWD IN2
11
PRE REV IN2
12
REF
13
14
14
21
20
19
18
17
16
AF
AMP
FM
AM
AF
OSC
OSC
BUFFER
FM
MUTE
AM
AM
FM
LEVEL
MIX
DET
DET
DET
FM
MIX
AM
FM
AGC
IF
IF
4
5
6
7
8
9
48 47 46 45 44 43
42
41
40
39
PRE DRIVER
FWD/
REV
OPERATION LOGIC
OSC
REF
OPERATION
PLUSE DET
DET
CURRENT
SPEED
DET
REF VOLTAGE
FOR SPEED CONTROL
DET
–
SYS
+
CONT
R.F
VREF
14
15 16 17
18 19
20 21 22
23 24
15
14 13
DECODE
VCO
DIVIDE
ST/MONO
FM/AM
TUN
ST
LED
LED
10
11
12
38
37
FREQ
CARC.
36
VSP
+
35
IN
34
MVREF
33
M-GND
LOW
32
LOW BOOST SW
BOOST
31
DET OUT
30
LOW BOOST IN1
29
LOW BOOST IN2
28
R.P1
27
R. P2
26
LP.2
25
MIX OUT2
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