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16
16
CDX-L550/L550V/L550X
J10
(ANTENNA)
2
10
1
ANTFM
MPX
CDL
8
AM DET
14
S-METER
12
I2C SDA
13
I2C SCL
9
RDS DET
17
E2PROM SDA
18
E2PROM SCL
ANTAM
TUNER UNIT
TU10
BUFFER
Q10
NOISE
SUPPRESSOR
5
1
IC20
Q22
NOISE
SUPPRESSOR
ON
7
90
2
45
47
70
13
14
19
20
17
9
12
43
28
SYSTEM CONTROL
IC501 (2/3)
ELECTRONIC VOLUME
IC401
OUT FL
27
OUT RL
35
BEEP
ATT
67
69
AMP ON
66
AMP ATT
40
TEL ATT
38
ACC IN
MD LCH
MPXI
AM
LEVEL
MPIN
SDA
SCL
EXA ATT
VOL ATT
QUALITY
NS MASK
VSM
I2C SIO
I2C CKO
MPTH
DAVN
E2P SIO
E2P CKO
R-CH
–1
L
–2
R
AUDIO OUT REAR
CD
SECTION
A
MUTE
CONT
Q478,479
Q451
MUTE
Q431
MUTE
PJ401–1, –2
R-CH
–3
L
–4
R
AUDIO OUT FRONT
22 MUTE
4 STBY
16 AUX
11
12
5
3
9
7
POWER AMP
IC404
1
9
2
10
CNP601
FL+
FL–
RL+
RL–
4
12
FR+
FR–
3
11
RR+
RR–
16 BATT
13 ATT
5 AMP R
6 ANT R
R-CH
BATT
F901
TEL
ATT
ATT
Q651
7 ACC
15 TEST
49
50
TUN ON
37
TEST IN
ACC
CHECK
Q631
POWER SUPPLY
IC601
3
PW ON
28
BU IN
4
2
7
6
BATT
BATT
BATT
VCC
AMP +B
8
ANT +B
9
COM 8V
10
TU 5.6V
11
TU 8.7V
COM 8V
5
BU+B
BU 5V
TU 5.6V
TU 8.7V
8.7V ON
5.6V ON
STB
9
20
2
10
MULTI
PATH
DET
LV IN
16
4
5
8
RDS/RDBS
DEM/DEC
8
27
MPX
OSCO
OSCI
SDA
SCL
X51
4.332MHz
87
86
RDS DECODER
IC51
PJ401–3, –4
• Signal path
:FM
:MW
:CD
BATT DET
Q551,557
BATT DET
Q556
3-3. BLOCK DIAGRAM — TUNER SECTION —
(Page 15)
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