CDX-C4750, CDX-C6600 - Sony Car Audio Service Manual (repair manual). Page 17

View Sony CDX-C4750 / CDX-C6600 Service Manual online

– 17 –
Carrier frequency: 1000 kHz
30% amplitude
modulation by
1 kHz signal
output level
: 33 dB (44.7 
µ
V)
Procedure:
1. Adjust IFT3 on TU601 so that the reading on the digital
voltmeter is 1.5 
±
 0.2 V.
Adjustment Location: tuner assy (TU601)
AM Auto Scan/Stop Level Adjustment
Setting:
SOURCE 
n MODE button
: AM
D-BASS switch
: OFF
Frequency Select switch (E model) : AM 10K
AM RF signal
generator
dummy
antenna
antenna
terminal
set
SPEAKER OUT
level
meter
+
30 
15 pF
30 pF
+
digital
voltmeter
S-METER OUT
Adjustment Location: tuner assy (TU601)
– tuner assy (TU601) (component side) –
AM AUTO
SCAN/STOP
LEVEL ADJ
IFT3
AM SENS
ADJ
IFT3      IFT1
FEB1
FM SENS/IF
ADJ
IFT4
FM CENTER
ADJ
– tuner assy (TU601) (conductor side) –
IC1
R24
S-METER
OUT
FM CENTER
OUT
– 18 –
  CD SECTION
Note:
1. CD Block basically constructed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use the oscilloscope with more than 10 M
 impedance.
4. Clean an objective lens by an applicator with neutral detergent
when the signal level is low than specified value with the following
checks.
Focus Bias Adjustment
Setting: This adjustment is performed with the set placed
horizontally.
Focus Gain Adjustment (Coarse adjustment)
This adjustment is not required unless the following parts are replaced:
Optical pick-up
RV4
Procedure:
1. Set RV4 to the standard position. (mechanical center)
2. Check whether operation noise (while noise type) caused by
the 2-axis device (lens section of the optical pick-up) is
abnormally loud.
If the operation noise is too loud, turn RV4 slightly counter-
clockwise.
If the gain is too low:
Focus does not function and no music is selected.
If the gain is too high:
Noise caused by scratches and dust is heard and the operation
becomes unstable.
Adjustment Location: servo board
Adjustment Location: servo board (component side)
Procedure:
1. Connect an oscilloscope between TP (RF) and TP (RF. GND)
on the SERVO board.
2. Connect the power supply.
3. Push the  RESET  button (S900) on the MAIN board.
4. Insert the disc (YEDS-18) and playback.
5. Adjust RV1 so that the oscilloscope waveform is clear and check
RF signal level is correct or not.
Note: Clear RF signal waveform means that the sharp “
” can be
clearly distinguished at the center of the waveform.
• When observing the eye pattern, set the oscilloscope to AC range
and raise the vertical sensitivity so that it may be easily seen.
Adjustment Location: servo board
RF signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
level: 1.0 – 1.5 Vp-p
IC3
CN1
IC1
CN2
FOCUS GAIN ADJ
RV4
TP
(RF. GND)
IC2
TP
(RF)
CN3
RV1
FOCUS BIAS ADJ
SERVO board
TP (RF)
TP (RF. GND)
oscilloscope
+
43
14 RF
59 CLKO
57 XLTO
56 DATO
21
PCMD
20
LRCK
22
BCK
34
XTAI
50 XRST
DIGITAL SIGNAL
PROCESSOR
IC1
55 CNIN
54 SEIN
1
FOK
3
MDP
27
GFS
46
SQSO
47
SQCK
49
SENS
51
DATA
52
XLAT
53
CLOK
SCOR
SERVO 5V
35 PD1
36 PD2
39 E
38 F
31
RFO
19
CLK
20
XLT
21
DATA
RF AMP, SERVO CONTROL
IC2
OPTICAL PICK-UP
KSS-520A
37 FE BIAS
SERVO 5V
PD
LD
RV1
FOCUS BIAS
RV4
FOCUS GAIN
LD DRIVE
Q2
1
FEO
2
FEI
16
SLO
22
XRST
23
C. OUT
24
SENS
25
FOK
6
FEO
13
TAO
34 PD
33 LD
Q1
16 CH2+
15 CH2-
18 CH1+
17 CH1-
19
CH1 IN
22
CH2 IN
24
CH3 IN
TRACKING
FOCUS
2
CH4 IN
FOCUS/TRACKING COIL DRIVE,
MOTOR DRIVE
IC3
13 CH3+
14 CH3-
M902
(SLED)
M901
(SPINDLE)
M903
(LOADING)
12 CH4+
11 COM
6
FWD
7
REV
4
CTL1
5
CTL2
10 CH5+
6
DIN
5
BCKIN
LRCIN
CLKO
12
VOUTL
VOUTR
R-CH
XTI
19
XTO
D/A CONVERTER
IC702
X700
16.9344MHz
MC/DM1
22
RSTB
30 DEEMPH
6
GFS
17 SQ SI
19 SQ CKO
78 CD SENCE
SYSTEM CONTROL
IC801(1/2)
SERVO  5V
M
M
M
I-V
CONV.
4
DATA25
3
XLAT25
28 CLOK25
75 SCOR
5
XRST
2
FOK
23 C IN
1
LD ON
115 CD EJ   
114 CD LD
PH3
CD 5V
REG
Q909
MD 8V
REG
Q912
MD 8V
SWITCH
Q910, 911
CD POWER
SWITCH
Q907,908
120
117
116 L SW
118 D SW
CD ON
32
35
MD ON
SW2
(SELF)
CD+5V
MD 8V
MAIN
SECTION
1
Signal path
          : CD
SW3
(LIMIT)
SW1
(DISC IN)
SW4
(DOWN)
04
BATT+B
BATT+B
COM 8V
SWITCH
 
Q913, 919
COM 8V
   REG
   Q904
COM+8V
COM8V ON
95
SELF SW/(IN SW)
IN SW/(PH1)
102
9
17
1
20
4
4-1. BLOCK DIAGRAM — CD SECTION —
– 19 –
– 20 –
CDX-C4750/C6600
SECTION 4
DIAGRAMS
4-2. BLOCK DIAGRAM — MAIN SECTION —
CDX-C4750/C6600
– 21 –
– 22 –
-3
L
1
3
62
63
64
1
1
1
2
18
12
16
13
11
21
20
22
19
83
81
53
9
10
6
6
8
15
25
24
5
4
CNJ600
(ANT)
AM ANT
FM L-CH
FM R-CH
AM OSC
MONO
IF/SEEK
VCO
SD
ST-IND
S-METER
TU+B
FM+B
AM+B
VT
LO/DX
AM DET
FM ANT
TUNER ASSY
TU601
R-CH
R-CH
Signal path
          : FM
          : AM
          : CD
CD
SECTION
PJ400
R-CH
R
-1
-2
BUS AUDIO IN
L
11
12
1
28
TONE
22
20
ELECTRONIC VOLUME
IC401
26
25
24
PDL
SE3L
SE2L
SE1L
SCL
SDA
MUTE
OUT FL
OUT RL
SYSTEM CONTROL
IC801(2/2)
58
104
14
13
90
61
49
37
101
109
47
48
12
15
60
FM+B
SWITCH
Q610,615
SWITCH
Q901,902
ILL+B REG
Q903
D-BASS
SWITCH
S501
ROTARY
ENCODER
RE501
12
13
16
71
70
65
28
9
PLL
IC601
MONO
IF FM
AM IN
SCL
SDA
SSTOP
FM IN
LPOUT
LCL/DX
X601
10.25MHz
29
13
2
10
3
11
4
9
8
6
12
1
22
21
36
76
20
46
79
106
107
BUS INTERFACE
IC803
RST
BATT
CLK
DATA
BUS ON
RES IN
BATT CHECK
CLK IN
DATA IN
DATA OUT
BUS ON
7
2
5
6
4
BATT+B
D807
LCD DRIVE
IC501
CE
CLK
DATA
LCD501
U COM 5V
+B
BATT+B
RESET
IC902
S900
RESET
CNP802
(REMOTE IN)
KEY MATRIX
LSW511-523,525-529
(KEY BOARD)
KEY ACTIVE
Q914,915
PL501
PL502
LAMP 
SWITCH
Q502, 505
LSW511-523, 525-529
LED501-505
TEL MUTE
SWITCH
Q916
POWER SUPPLY
IC901
AMP ON
VCC
AMP+B
BATT+B
BATT+B
ACC
CHECK
Q905
F901
11
3
12
4
10
2
9
1
13
TEL MUTE
16
BATT
7
ACC
5
AMP REM
6
ANT REM
15
TEST
SCL
X1A
X0A
SDA
SSTOP
SD IN
ST/MONO
S-METER
KEY IN0
SYSRST
UNI CK
UNI SO
UNI SI
BUS ON
BU IN
AD ON
KEY ACK
RE IN0
RE IN1
ACC IN
TEL ATT
KEY IN1
KEY IN2
RC IN1
RC IN0
RESET
108 LAMP ON
LCD CKO
LCD SO
P1/S1
LCD CE
 ANT REM
AMP ATT
BAND
BEEP
Q402
ATT
VOL ATT
PW ON
 TEST
FLS SI/NOSE1
Q110
Q401
Q111
12
11
5
3
9
7
POWER AMP
IC200
22 4
FL
RL
MUTE
STBY
-6
REAR
R
-5
L
-4
FRONT
R
R-CH
R-CH
PJ401
PJ400
R-CH
CNP501
FL+
FL-
RL+
RL-
FR+
FR-
RR+
RR-
31
AMP ON 56
100
111
80
SW802
FREQUENCY
SELECT
FM200K
AM10K
04
BATT+B
D918
D919
LINE OUT
92
93
X800
4.19MHz
X0
X1
73
74
X801
32kHz
FM50K
AM9K
D909
BATT+B
BU CHECK
 Q906    
ANT REM
SWITCH
Q924,925
66
1
2
4
AM OSC
Q614
14 IF AM
SEEK
10
9 OSC IN
OSC OUT
1
2
3
LP FM
LP HC
LP AM
TU+5V REG
Q613
TU+B
SWITCH
Q603,609
TU+5V
COM+8V
68 FM ON/AM ON
AM+B
SWITCH
Q612
86 HSTX
69 TU ON
D602
8
D910
+B
C6600

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