6-2.
BLOCK DIAGRAM – TUNER Section – (East European, CIS MODELS)
STEREO
TUNED
MUTE
ST-CE
COM-DIN
COM-CLK
COM-DATA
TM1
ANTENNA
FM 75
Ω
COAXIAL
AM
ANT IN
IF OUT
F OUT
VT
FE1
FM FRONT END
ST +10V
IF AMP
Q1,2
IF AMP
Q3,4
CF1
10.7MHz
CF2
10.7MHz
CF3
10.7MHz
1
FM IN
5
3
2
26 25 24 23
22
21 20
17
16
15
14
13
12
4
27
6
Q12
MW SW
Q14
LW SW
Q13
MW SW
Q11
MW SW
11
LW SW
Q9
REG
29 AM OSC
AM RF IN
FM OSC
MW
RV42
FM
TUNED
LEVEL
3
4
5
6
30
14 15 11
FM SD
AM / FM
VCO STOP
IF BUFF MUTE
23
9
5
13
12
2
AM
SD
AM
SD
AM MIX
AM IF
IFT41
X42
450KHz
X43
456KHz
X41
10.7MHz
TUNED
LEVEL
AM
PEAK ADJ
L1701
CT1701
RV1701
TP1701
(FILTER)
SUB CARRIER
RV41
MPX IN
AM / FM
8
5
9
4
3
7
STEREO
TUNED
FM / AM MPX
IC1702 SWITCH
IC41
24
22
OUT R
RCH
L IN
L OUT
R CH
POLA
L IN
21
AMP IN L
OUT L
LPF
20
18
14
7
2 12 8
1 24
AM OSC
FM
VCO STOP
FM / AM IF
IF REQ
X IN
X OUT
CE
DI
CL
DO
AMP OUT L 16
A MAIN SECTION
(page 43)
PLL
IC21
FE2
MW / LW FRONTEND
•
R CH :Same as L CH
•
SIGNAL PATH
:FM
:MW
:LW
X21
4.5MHz
AM IF
DET
VCO
Q5
68
67
65
66
72
69
70
11
LEVEL ADJ
SUB CARRIER
2
3
IN
20
19
GATE
WAVE
FORM
14
S&H
BUFFER
PHASE
COMP.2
TRIGGER
10
9
MUTE
OSC
1/2
1/2
PHASE
6
7
19
18
IC1701 POLAR DECODER
R CH
TP1702
(VCO)
PHASE
COMP.1
RV1702
VCO
Q1702
SW
13
FM LOW
Q1703
SW
+7V
Q1701
SW
B MAIN SECTION
(page 44)
05
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