CDX-C4840R, CDX-C4850R - Sony Car Audio Service Manual (repair manual). Page 21

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– 21 –
IC3
CN2
CN1
IC1
FOCUS GAIN ADJ
RV4
TP
(RF. GND)
IC2
TP
(RF)
CN3
RV1
FOCUS BIAS ADJ
RF signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
level: 1.0 – 1.5 Vp-p
+
SERVO board
TP (RF)
TP (RF. GND)
oscilloscope
  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
– 22 –
4-1. IC PIN DESCRIPTION
• IC801 MB90574APMT-G-199-BND (SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Pin Description
1
LD ON
O
Laser ON/OFF control output
2
FOK
I
Focus OK signal detection input
3
XLAT25
O
CD signal processing latch output
4
DATA25
O
CD signal serial data output
5
XRST
O
Reset output to CD signal processor IC.
6
GFS
I
GFS signal detection input
7
NIL
Not used. (Connect to ground in this set.)
8
VCC
Power supply pin (+5 V)
9 – 11
NIL
Not used. (Open)
12
FLS SI/NOSE1
I
Front panel attachment detection input
13
LCD SO/FLS SO
O
LCD serial data output
14
LCD CKO
O
LCD serial clock output
15
BEEP
O
BEEP output
16
NIL
Not used. (Open)
17
SQ SI
I
Sub Q data input
18
NIL
Not used. (Connect to ground in this set.)
19
SQ CKO
O
Sub Q read clock output
20
UNI SI
I
BUS system serial interface input
21
UNI SO
O
BUS system serial interface output
22
UNI CK
I/O
BUS system serial clock input/output
23
C IN
I
Track jump No. count input
24
SIRCS
I
Remote commander input
25
TXT SI
I
CD-TEXT data input
26
NIL
Not used. (Connect to ground in this set.)
27
TXT CKO
O
CD-TEXT data read clock output
28
CLOK25
O
CD signal processing serial clock output
29
SYSRST
O
System reset output
30
DEEMPH
O
De-emphasis output
31
AMP ATT
O
Power amplifier attenuator control output
32
MD ON
O
CD mechanism power control output
33
VSS
Ground
34
C
Power stabilization capacitor pin
35
CD ON
O
CD power control output
36
BUS ON
O
BUS ON control output
37
NIL
O
Power control output of A/D conversion.
38
DVCC
VREF input of D/A converter.
39
DVSS
Ground of D/A converter.
40
NIL
Not used. (Open)
41
ANGLE
O
LCD view angle alignment output (Not used in this set.)
42
AVCC
Analog power supply pin (+5 V)
43
AVRH
VREF + input of A/D converter.
44
AVRL
VREF – input of A/D converter.
45
AVSS
Analog ground
46 – 48
KEY IN0 – 2
I
Key input 0 – 2
49
RC IN0
I
Rotary commander input 0
50
QUALITY
I
Noise detection input
51
NIL
Not used. (Connect to ground in this set.)
52
MPDH
I
Tuner multi path input
53
S-METER
I
S-meter voltage detection input
54
VCC
Power supply pin (+5 V)
55
NS MASK
O
Noise detection output
SECTION 4
DIAGRAMS
Pin No.
Pin Name
I/O
Pin Description
56
AMP ON
O
Power amplifier power control output
57
TXT ON
O
Reset output to CD-TEXT decoder IC.
58
VOL ATT
O
Electric volume mute control output
59
NIL
Not used. (Open)
60
ATT
O
System attenuate control output
61
RC IN1
I
Rotary commander shift key input 1
62
TU ATT
O
Tuner attenuate output
63
VSS
Ground
64
NIL
Not used. (Open)
65
SSTOP
I
IF counter result signal detection input of PLL.
66
TEST
I
Test mode initial setting detection input
67
DAVN
I
RDS IC data acquisition detection input
68
FM ON/AM ON
O
FM ON output
69
TU ON
O
Tuner power control output
70
SDA
I/O
I
2
C BUS serial data input/output
71
SCL
O
I
2
C BUS serial clock output
72
NOSE2
I
Front panel OPEN detection input
73
X1A
O
Sub ceramic oscillator output (32 kHz)
74
X0A
I
Sub ceramic oscillator input (32 kHz)
75
SCOR
I
SCOR signal detection input
76
BU IN
I
Backup power detection input
77
DQSY
I
CD-TEXT data setting completion signal detection input
78
CD SENS
I
CD SENS signal detection input
79
NIL
I
Key input acknowledge
80
TEL ATT
I
Telephone attenuate detection input
81
ST/MONO
I/O
Tuner stereo signal detection input/forced monaural output
82
SEEKOUT
O
SEEK output
83
SD IN
I
Signal detector input
84
WIDE
O
WIDE select output (Not used in this set.)
85
NARROW
O
NARROW select output (Not used in this set.)
86
HSTX
Hardware standby input (Connect to pin (º (RESET).)
87
MD2
Operation mode input (Connect to ground in this set.)
88, 89
MD1, 0
Operation mode input (Connect to VCC in this set.)
90
RESET
I
Reset input
91
VSS
Ground
92
X0
I
Main ceramic oscillator input (4.19 MHz)
93
X1
O
Main ceramic oscillator output (4.19 MHz)
94
VCC
Power supply pin (+5 V)
95
COM8V ON
O
COM 8V control output
96
NIL
Not used. (Open)
97
AREA1
I
Destination select input 1 (Fixed at “L” in this set.)
98
AREA2
I
Destination select input 2 (Fixed at “L” (AEP, UK model) or “H” (German model)
in this set.)
99
LOUD
I
Fixed at “L” in this set.
100
BAND
I
Fixed at “H” in this set.
101
ACC IN
I
Accessory power detection input
102, 103
PH3, 2
I
Disc insertion detection photo sensor input (Fixed at “H” in this set.)
104
LCD CE
O
LCD chip enable output
105
FLS W
I
Flash write input (Fixed at “H” in this set.)
106, 107
RE IN0, 1
I
Rotary encoder input
108
ILL ON
O
Illumination power control output
109
PW ON
O
System power control output
110
NIL
Not used. (Open)
Pin No.
Pin Name
I/O
Pin Description
111
ANT REM
O
ANT REMOTE power control output
112
NIL
Not used. (Open)
113
CTL2
Not used in this set.
114
CD LD
O
Loading motor control output (Loading direction)
115
CD EJ
O
Loading motor control output (Eject direction)
116
L SW
I
Sled limit switch detection input
117
IN SW/(PH1)
I
Disc insertion detection input
118
D SW
I
DOWN switch detection input
119
VSS
Ground
120
SELF SW/(IN SW)
I
Disc self store detection input
– 23 –
– 24 –
– 25 –
– 26 –
CDX-C4840R/C4850R
4-2. BLOCK DIAGRAM — CD SECTION —
35
31
36
39
38
PD1
RF
CLKO
XLTO
DATO
SE IN
FOK
CN IN
RF 0
21
PCMD
22
BCK
20
LRCK
34
XTAI
27
GFS
19
CLK
20
XLT
21
DATA
24
SENS
25
FOK
23
14
DIN
59
57
56
54
1
55
C. OUT
37
FE BIAS
22
50
XRST
16
SLO
6
FEO
13
TAO
PD2
E
F
1 FEO
2 FEI
34 PD
33 LD
XRST
MDP
RF AMP, SERVO CONTROL
IC2
OPTICAL PICK-UP
KSS-521A
DIGITAL SIGNAL PROESSOR
IC1
D/A CONVERTER
IC702
FOCUS
GAIN
RV4
FOCUS
BIAS
RV1
LD POWER
CONTROL
Q1, 2
PD
LD
FOCUS/TRACKING COIL DRIVE,
MOTOR DRIVE
IC3
CH2 IN
LEVEL
SHIFT
22
16
15
TRACKING
CH1 IN
LEVEL
SHIFT
19
18
17
FOCUS
M902
(SLED)
CH2+
CH2–
CH1+
CH1–
CH3 IN
LEVEL
SHIFT
24
13
14
CH3+
CH3–
M
M901
(SPINDLE)
CH4 IN
LEVEL
SHIFT
2
CTL2 5
12
CH4+
M
M903
(LOADING)
FWD
LEVEL
SHIFT
6
REV
7
10
CH5+
M
49
SENS
46
SQSO
47
SQCK
51
DATA
52
XLAT
53
CLOK
43
SCOR
45
EXCK
41
WFCK
44
SBSO
5
BCKIN
6
LRCIN
4
CLKO
19
XTI
1
XTO
20
RSTB
15
12
V OUTL
9
V OUTR
17
MC/DM1
X700
16.9344MHz
3
1
2
4
3
11
12
13
6
SELECT
SWITCH
Q3-6
SCOR
EXCK
SBSO
WFCK
TXT ON
SCOR
CLOK25
XLAT25
DATA25
SQ CKO
SQ SI
CD SENS
GFS
XRST
TXT CKO
TXT SI
DQSY
C IN
FOK
LD ON
L SW
IN SW
D SW
SELF SW
XMODE
SCLK
SRDT
DQSY
CD TEXT
IC703
SW3
(LIMIT)
SW1
(DISC IN)
SW4
(DOWN)
SW2
(SELF)
23
2
1
114
115
116
117
118
120
27
25
77
57
75
28
3
4
19
17
78
6
5
DEEMPH
R-CH
30
SYSTEM CONTROL
IC801 (1/3)
CD L-CH
TUNER
SECTION
A
I-V
AMP
04
• Signal path
       : CD
(Page 27)

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