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4-2.
BLOCK DIAGRAM – TUNER Section –
FM/AM TUNER UNIT
TU1
J1
(FM/AM ANTENNA)
2 FM-ANT
(C7970)
(C7970R)
1
AM-ANT
4
5
6
21
(C7970) (C7970R)
FILTER
5
1
2
3
28
24
25
15
14
FM/AM PLL
IC100
16
13 12
69
(C7970: E model)
S701
FREQUENCY SELECT
MW 10K/FM 200K
100
BAND (9K-10K)
MW 9K/FM 50K
05
8
(C7970)
(C7970R)
(C7970)
21
11
13
24
13
11
20
22
(C7970R)
FM RDS
S-METER
AM OSC
BUFFER
Q4
10
OSCOUT
OSCIN
9
X1
10.25MHz
WIDE/NARROW
SWITCH
Q7
Q8
WIDE/
NARROW
SWITCH
68
66
82
83
81
MASTER CONTROLLER
(C7970R)
IC700 (1/4)
– 25 –
FM B+
AM B+
TUNER B+
10
9
FM-LCH
18
(C7970R)
FM-RCH
16
R-CH
AM-DET
12
19
15
23
RV1
BUFFER
Q50
B+ SWITCH
Q51
(C7970)
14 7
RDS DECODER
FM/AM SIGNAL
METER BUFFER
Q1
SC
57 kHz
OUT
16
18
19
BAND-PASS
MPX
FILTER
MULTI
LVIN
20
PATH
2
DETECTOR
BAND-PASS
FILTER
IC101
Q5
NOISE DET
DISCHARGE
SWITCH
53
51
35
52
(C7970R)
MUTING
Q101
R-CH
D5
MUTING
CONTROL SWITCH
Q103
BACKUP +5V
FM B+
5
IC102
SIGNAL
QUALITY
DECODER
4
RDS/RDBS
CIN
CLOCKED
INTERFACE
DEMODULATOR
COMPARATOR
REGISTER
& DECODER
IIC BUS
OSCILLATOR
SLAVE
& CLOCK
TRANSCEIVER
5
4
8
9
10
X2
4.332MHz
67
62
– 26 –
MDX-C7970/C7970R
FM
E
(Page 27)
AM
F
(Page 27)
DATA, CLOCK
G
(Page 27)
• SIGNAL PATH
: FM
: AM (MW/LW)
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