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Q Q
3 7 6 3 1 5 1 5 0
6-1.
BLOCK DIAGRAM – TUNER Section –
FM RF AMP/MIX/OSC
IC901
FM RF
IN
B. P. F.
FM RF
1
FM MIX
BPF901
AMP
FM OSC
15
L902
FM RF
FM OSC
TC901
BUFFER
L902, TC901
D905
D906
FM TRACKING
CN13
FM ANT
75Ω
COAXIAL
T6
CN12
AM RF
AM ANT
T E
L
1 3 9 4 2 2 9 6 5 1 3
D5
T8
TC1
AM OSC
T6, TC1
AM TRACKING
AM FREQUENCY
FM/AM PLL
U2
14
• R-ch is omitted due to same as L-ch.
• SIGNAL PATH
: FM
w w w
: AM
.
SECTION 6
DIAGRAMS
T901
FM IFT
MIX
OUT
3
13
L901
FM OSC
L901
Q901
FM FREQUENCY
COVERAGE
CF3
10.7MHz
CF4
AM-RF
AM-MIX
450kHz
-IN
AM
AM
27
2
RF AMP
MIX
T1
AM-OSC
AM
AM IF
29
OSC
30
T8
COVERAGE
L. P. F
13
18
1/2
SWALLOW
COUNTER
x
a o
y
i
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8
FM/AM IF AMP,
AM RF AMP/MIX/OSC,
FM/AM DET, MPX
U1
FM-DET
FM-IN
OUT
MPX-IN
FM
L. P. F.
1
FM IF
23
22
DET
T4
24
AM-DET OUT
AGC
AM-IF
4
AM IF
DET
Q
Q
3
7
6
3
9
T5
FM DET
X2
7.2MHz
17
16
1
20
REFERENCE
PHASE
PHASE
DIVIDER
DETECTOR/
DETECTOR/
CHARGE PUMP
CHARGE PUMP
12 BIT
UNLOCK
PROGRAMMABLE
DETECT
DIVIDER
SHIFT REGISTER & LATCH
u 1 6 3
.
15
15
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2
4
9
9
8
AMP-
OUT L
IN L
L. P. F.
21
19
T2
DECODER
OUT R
20
R-CH
MUTING
1
5
1
5
0
8
9
2
4
AM/FM
IF BUFFER
13
14
15
FM/AM BAND
STEREO/MONO
SELECT SWITCH
SWITCHING
Q3
Q17
11
10
6
DI
3
CL
4
CCB
CE
INTERFACE
2
DO
5
UNIVERSAL
COUNTER
m
c o
HCD-EP50LIV
2
9
9
AMP-
OUT L
TU-L
B
(Page 17)
17
TU-R
R-CH
9
8
2
9
9
6
7
ST/BEAT
C
(Page 16)
FM ON/OFF
D
(Page 18)
STEREO
STATION
DA IN
CLOCK
PLL CE
DA OUT
E
(Page 17)
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