16
WM-FX277
AM RF IN
FM RF OUT
FM RF IN
RF GND
AM LOW
-CUT
FM/AM
MIX OUT
AGC
VCC
AM IF IN
FM IF IN
GND
TUN LED
ST LED
QUAD
FM OSC
AM OSC
AFC
DET OUT
MPX IN
LPF2
LPF1
L-OUT
R-OUT
7
5
4
3
1
2
6
8
9
12
10
11
14
15
16
17
18
19
21
20
24
23
RF VCC
22
13
Φ Φ
DECODER
VCO
DIVIDER
ST/MONO
FM/AM
AF
AMP
FM
MUTE
AF BUFFER
FM
DET
AM
DET
AM
RF AMP
FM
RF AMP
FM
MIX
FM
OSC
AM
OSC
AM
MIX
TUN
LED
ST
LED
FM IF
AMP
AM IF
AMP
AGC
LEVEL
DET
• IC BLOCK DIAGRAMS
IC1 TA2111F-(EL)
IC301 LB8115W-NA-TLM
1
2
36
35
34
33
32
31
30
29
28
27
26
25
13
14
15 16 17
18 19
20 21 22
23 24
48 47 46 45 44 43
42
41
40
39
38
37
COM
RI
VREF
POWER OUT (COM)
POWER OUT (R)
VCC
POWER MUTE
POWER IN (L)
POWER IN (R)
MIX OUT (L)
MIX OUT (R)
LP.2
H.P IN (R)
H.P IN (L)
DET OUT
MVREF
IN
+
VSP
MIX IN (R)
MIX IN (L)
LOW BOOST SW
M-GND
R.REF
SYSTEM
POWER OUT (L)
POWER GND
MVCC
DR
WOUT
MP-GND
VOUT
UOUT
FC
OUT
OSC
UB
VB
WB
3
4
5
6
7
8
9
10
11
12
PRE NF (L)
PRE OUT (R)
PRE NF (R)
PRE FWD IN (R)
PRE REV IN (R)
PRE REV IN (L)
PRE FWD IN (L)
S/S
PRE GND
PRE OUT (L)
BIAS
R.F
REF
SYS
CONT
DET
VREF
SPEED
LOW
BOOST
PRE DRIVER
OPERATION LOGIC
OSC
PLUSE DET
REF
VOLTAGE
REF VOLTAGE
FOR SPEED CONTROL
CURRENT
DET
OPERATION
DET
FWD/
REV
FREQ
CARC.
+
—
