Read Sony CDX-C680 / CDX-C780 Service Manual online
4-5. BLOCK DIAGRAM — TUNER SECTION —
CDX-C680/C780
– 41 –
– 42 –
1
2
AM ANT
FM ANT
8 FM +B
9 +B
18
40
33
32
41
42
39
16
L OUT
R OUT
12
13
20
22
19
5
AM DET
RECEIVE/SEEK
SD
STIND
S-METER
24
7
WIDE/NARROW
5
VT
10 AM +B
R-CH
Q17
Q16
MUTE
CONTROL
Q19
MUTE
CONTROL
Q205, 206
ACC
CHECK
Q608
BU
CHECK
IC604
BEEP
DRIVE
Q502
MUTE
CONTROL
Q211
POWER
CONTROL
Q601, 602
VOL
CONTROL
Q203
TUNMUTE
67
CKO
66
SO
64
VOLCE
68
SUB CE
80
NOSE SW
61
SW1
62
65
SW0
MUTE
118
LEDON
81
ACC IN
78
ILL IN
79
TELMUTE
58
TEST IN
15
BEEP
55
1
2
RAM BU
120
POW ON
3
WIDE
CONTROL
Q15
NARROW
CONTROL
Q14
VT
CONTROL
Q51
8.5V REG
Q12
WIDE
25 SI
1 SEEK OUT
20 SDIN
4 ST/MONO
53 VSM
4
LO/DX
11
AM IF
21
FM IF
NARROW
6
DOUT
5
DIN
4
CLK
3
CE
18 PD
9 LO/DX
1 XI
20 XO
13 IF IN
6
VCO
15 AM OSC
16 FM OSC
X10
7.2MHz
TUNER PLL
IC10
26 SO
27 CKO
28 CE
PLL
TUNER UNIT
TU10
SUB
VOL/
SUB
AUXINL
CDINL
FMINL
AMINL
R
L
1
3
AMP
IC11
IC11
D13
CDINL
BUS AUDIO IN
-4
-3
CN202
R
L
FRONT
-1
-2
CN201
CN201
1
CD
SECTION
2
CD
SECTION
31
30
21 16 22
11
14
13
20
15
12
11
7
9
4
15
9 10
9 8 7
26
25
23
7
24
R-CH
TONE
CLK
DATA
CE
7
5
LINE AMP
IC203
B A
SWITCH
IC201
CLK
DATA
CE
ELECTRONIC VOLUME
IC204
ELECTRONIC VOLUME
IC202
SW802
(NOSE DET)
AMUT
12
7
LINE DRIVER
IC205
2
12
13
SW201
(LINE OUT/IN)
OUT IN
Q201
Q207
Q208
LINE DRIVER
IC207
REO1
FNTO1
Q214
Q215
GND
ISOLATION
IC209
GND
ISOLATION
IC210
STBY
22
MUTE
3
5
1
9
2
10
5
14
13
15
7
16
6
BATT
BATT
BU5V
ILL
CHECK
Q604
ACC
D607
D602
6
FM ON
7
4
3
2
TU ON
56
POW SEL
REG
IC603
3
1
BATT
ANT+B
BZ501
BEEP
SW502
(POWER SELECT)
OFF
ON
MODE2
MODE1
STB
9
8
COM8V
ANT+B
ANT+B
7
VCC
10 AM8V
11 FM8V
COM8V
AM8V
FM8V
POWER SUPPLY
IC602
ACC
F601
BATT
Q622
BU5V
5V REG
Q11
TU8.5V
TU5V
FM8V
AM8V
D12
(ANTENNA)
R-CH
R
L
REAR
-3
-4
R-CH
R
L
EQ OUT
-1
-2
R-CH
CN202
R
L
SUB OUT
-1
-2
R-CH
LINE
OUT/IN
POWER AMP
IC211
CN601
FL+
FL-
RL+
RL-
AMP REM
ILL
TEL MUTE
TEST
ACC
BATT
ANT REM
C780
C780
C780
C680
C680
D202
D212
1
13
1
13
D201
04
SYSTEM CONTROL
IC501 (1/2)
Signal path
: FM
: AM
: CD
: FM
: AM
: CD
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