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4-4. BLOCK DIAGRAM — TUNER SECTION —
BUS AUDIO IN
(Page 32)
TUNER UNIT
1
TU10
CDINL
CD
(ANTENNA)
SECTION
1
AM ANT
L OUT
18
R-CH
2
FM ANT
R OUT
16
AM DET
12
2
7
SWITCH
8 FM +B
FM8V
IC104 (1/2)
Q17
Q16
D12
9 +B
D13
AM8V
10 AM +B
MUTE
CONTROL
Q19
RECEIVE/SEEK
13
SD
20
STIND
22
S-METER
19
RV10
S-METER
WIDE/NARROW
24
VT
1
CONTROL
7
IC12
2
VT
VT
5
CONTROL
18 PD
Q51
LO/DX
4
9 LO/DX
1 XI
23
FM DET
X10
15
S-METER (RDS)
7.2MHz
20 XO
AM IF
11
13 IF IN
FM IF
21
VCO
6
15 AM OSC
16 FM OSC
20 LVIN
4 OSCD
X101
4.332MHz
5 OSCI
14 VDDA
POWER
7 VDDD
BU5V
SWITCH
Q101
FM8V
BUFFER
16
Q10
8.5V REG
TU8.5V
Q12
ANT+B
5V REG
TU5V
Q11
04
– 35 –
CN202
-4
R
R-CH
ELECTRONIC VOLUME
-3
IC202
AUXINL
L
42
CDINL
41
3
1
FMINL
40
33
32
31
30
TONE
AMP
IC11
AMINL
1
39
21 16 22
6
5
SWITCH
3
IC104 (2/2)
Q102
SYSTEM CONTROL
IC501 (1/2)
Q103
60
TIRPLAY
5
TUNMUTE
1 SEEK OUT
VOL/
CKO
67
SUB
20 SDIN
SO
66
4 ST/MONO
VOLCE
64
BUFFER
SUB CE
68
53 VSM
Q13
SW802
NOSE SW
80
(NOSE DET)
WIDE
CONTROL
3
WIDE
Q15
AF
SW1
61
SEEK
SUB
SW0
62
NARROW
Q52
CONTROL
BEEP
Q14
15
DRIVE
BEEP
2
AFSEEK
Q502
TUNER PLL
IC10
MUTE
65
NARROW
7
118
LEDON
ACC
81
CHECK
ACC IN
Q608
CE
3
28 CE
ILL IN
78
CLK
4
27 CKO
PLL
DIN
5
26 SO
TELMUTE
79
DOUT
6
25 SI
TEST IN
58
SW502
(POWER SELECT)
POW SEL
56
RDS
DEMODULATOR
OFF
IC101
POW ON
120
MPTH
2
52
MTP
FM ON
6
DAVN
8
75
DAVN
7
SDA
9
70
SIO
TU ON
SCL
10
71
CKO
TIR CONTROL
4
IC103
D0-3
D0-3
95
5
BUSY
BUSY
CE
98
56
CE
RD
101
55
RD
WR
96
54
WR
MPX
RES
99
53
RESET
DWN
100
35
PDWN
CE
CE
97
11
47
XT1
X102
4.19MHz
48
XT2
L IN
26
LINE DRIVER
IC207
FNTO1
24
2
13
LINE AMP
IC203
5
7
26
25
23
7
12
REO1
D212
SWITCH
IC201
LINE DRIVER
ELECTRONIC VOLUME
IC205
IC204
11
12
7
14
13
20
15
15
B A
9 10
9 8 7
D202
VOL
CONTROL
Q203
(Page 32)
2
AMUT
BZ501
BEEP
CD
SECTION
D201
MUTE
CONTROL
Q205, 206
D607
ACC
Q622
FM8V
AM8V
ON
COM8V
TIR SIGNAL
REGISTER
IC102
44
15
DOUT
D-IN/OUT
11
D-IN
RWCK
50
2
RWCK
WE
46
16
WE
CSI
40
17
CS
TAS
37
18
TAS
SAS
SAS
36
22
SADX
39
23
SAD
AOUT
18
ADPCM/
DAC
CN201
-1
L
FRONT
R-CH
-2
R
Q207
LINE
OUT/IN
-3
L
REAR
R-CH
-4
R
Q208
CN202
-1
L
SUB OUT
Q201
R-CH
-2
R
POWER AMP
CN601
IC211
1
5
FL+
12
9
3
FL-
Q215
2
9
RL+
11
10
7
RL-
Q214
4
22
MUTE
CONTROL
Q211
POWER
5
CONTROL
BATT
AMP REM
Q601, 602
D602
ILL
14
CHECK
ILL
Q604
13
TEL MUTE
15
TEST
7
ACC
ACC
POWER SUPPLY
16
IC602
BATT
BATT
F901
11 FM8V
10 AM8V
ANT+B
6
9
COM8V
ANT+B
8
ANT REM
4
STB
VCC
7
BATT
3
MODE1
2
MODE2
• Signal path
: FM
: MW
: CD
– 36 –
CDX-C7850R
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