Sony CDX-848X Service Manual ▷ View online
17
CDX-848X
SECTION 5
ELECTRICAL CHECK
Note:
1. This check is performed with the set placed horizontally.
2. Power supply voltage: DC14.4 V (more than 3 A).
3. Be sure to use the disc “YEDS-18” parts code: 3-702-101-01, but only
2. Power supply voltage: DC14.4 V (more than 3 A).
3. Be sure to use the disc “YEDS-18” parts code: 3-702-101-01, but only
when indicated.
Connection:
Focus Bias Check
Connection:
– RF Board (Component Side) –
Procedure:
1. Connect the oscilloscope to TP (RFAC) and TP (VC) on the
1. Connect the oscilloscope to TP (RFAC) and TP (VC) on the
RF board.
2. Put the set into play mode by loading the disc (YEDS-18).
3. Confirm that oscilloscope waveform is clear and check RF sig-
3. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
Note:
Clear RF signal waveform means that the shape “
◊
” can be clearly distin-
guished 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.
and raise the vertical sensitivity so that it may be easily seen.
GND
+
BUS cable
compact disc changer
master unit
CONTROL connector
(CN901)
(CN901)
power supply
(DC 14.4 V)
RF signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
(10 : 1 probe in use)
TIME/DIV: 500 ns
(10 : 1 probe in use)
level: 1.4
±
0.3 Vp-p
oscilloscope
(AC range)
+
–
–
TP (VC)
TP (RFAC)
IC101
18
CDX-848X
Tracking Offset Check
Connection:
– RF Board (Component Side) –
Procedure:
1. Connect the oscilloscope to TP (TE) and TP (VC) on the RF
1. Connect the oscilloscope to TP (TE) and TP (VC) on the RF
board.
2. Put the set into play mode by loading the disc (YEDS-18).
3. Press the
3. Press the
[ AMS ]
button on the master unit, and check
the traverse waveform*.
4. Confirm that the oscilloscope waveform is symmetrical on the
top and bottom in relation to 0 V dc, and check this level.
* Traverse waveform: This is the tracking error wave form appears
when crossing the track.
A
B
0 V
A=B
traverse waveform
(100 track jump waveform)
(100 track jump waveform)
VOLT/DIV: 500 mV
TIME/DIV: 2 ms
Center: 0 V
TIME/DIV: 2 ms
Center: 0 V
Traverse waveform
oscilloscope
(DC range)
+
–
–
TP (VC)
TP (TE)
IC101
. >
CDX-848X
19
19
RFAC
SUMMING
AMP
RFDC
SUMMING
AMP
AC
SUM
4
3
EQ IN
7
8
9
A
B
C
D
RW/ROM
28
30
16
18
RFDCO
DC OFST
FE
TE
E
F
10
11
FOCUS
ERROR
AMP
TRACKING
ERROR
AMP
SW
PD
12
2
LD
1
APC AMP
RW/ROM
15
RFAC
RFAC
VCA
RF EQ
AMP
116, 115,
118, 117
RF
FE
TE
109 – 106, 7 – 5,
3 – 1, 111
9 – 12, 15 – 19,
21, 8
2, 3,
24, 25
5
23
4
22
RAS
CAS
WE
OE
113
119
114
120
XRAS
XCAS
XWE
XOE
VIBRATION
MEMORY
CONTROLLER
&
COMPRESSION
EXPANDER
A0 – A10
A0 – A10
DQ1 – DQ4
D0 – D3
RFAC
ASYI
ASYO
71
73
74
66 69 68 67
FILO
CLTV
PCO
FILI
ASYMMETRY
CORRECTOR
DIGITAL
PLL
EFM
DEMODULATOR
INTERNAL BUS
D/A
INTERFACE
ERROR
CORRECTOR
32k RAM
15
15
15
90
88
86
BCK
PCMD
LRCK
SELECTOR
DIGITAL
OUT
15
85
DOUT
15
93
15
94
XTAI
XTAO
CLOCK
GENERATOR
15
78
15
81
WDCK
GFS
15
23
15
25
15
24
15
26
15
14
15
15
15
17
DATA
CLOK
XLAT
SENS
SQSO
SQCK
SCOR
SUBCODE
PROCESSOR
CPU
INTERFACE
XRDE
XWRE
XQOK
15
9
15
8
15
12
XRDE
XWRE
XQOK
SERVO AUTO
SEQUENSOR
SCLK
FOK
XRST
27
35
21
SERVO
INTERFACE
45
SSTP
TE
FE
RF
SE
TE
FE
RFDC
61
60
62
58
OP AMP
ANALOG SW
A/D CONVERTER
SERVO DSP
PWM GENERATOR
50
51
48
49
46
47
43
FFDR
FRDR
TFDR
TRDR
SFDR
SRDR
MDP
MIRR
DECT
FOK
DIGITAL
CLV
6
7
8
9
10
11
12
13
5
4
VO4 +
VO4 –
VO3 +
VO3 –
VO2 +
VO2 –
VO1 +
VO1 –
VL0 +
VL0 –
VIN4 +
VIN4 –
VIN3 +
VIN3 –
VIN2 +
VIN2 –
FWD
REV
31
32
25
24
22
21
1
2
MOTOR
DRIVE
MOTOR
DRIVE
MOTOR
DRIVE
COIL
DRIVE
MOTOR
DRIVE
COIL
DRIVE
TRACKING/FOCUS COIL DRIVE,
SLED/SPINDLE/CHUCKING
MOTOR DRIVE
IC201
A
B
C
D
E
F
I-V AMP
PD
LD
DETECTOR
(TRACKING)
(FOCUS)
2-AXIS DEVICE
OPTICAL
PICK-UP BLOCK
(KSS-720A)
LASER DIODE
M
M
M101
(SLED)
M
M
M102
(SPINDLE)
M
M
M103
(CHUHCKING)
DATA
BCK
LRCK
2
1
3
SERIAL
INPUT
INTERFACE
8 TIME OVER
SAMPLING
DIGITAL FILTER
WITH
FUNCTION
CONTROLLER
MODE
CONTROL
INTERFACE
22
27
RST
DM1
MULTI LEVEL
∆
∑
MODULATOR
D/A
CONVERTER
LOW-PASS
FILTER
15
88
15
16
15
13
VOUTL
VOUTR
BPZ
CONTROL
CRYSTAL
OSCILLATOR
3
6
4
XTI
XTO
CLKO
SCK
LOW-PASS
FILTER
IC401
LOW-PASS
FILTER
IC401
LINE
AMP
AMP
IC402
L
R
ANALOG OUT
MUTING
Q410, 420
SW3
(LIMIT)
SW1
(CHUCKING END DETECT)
SW2
(SAVE END DETECT)
ON : When the optical pick-up
is inner position
is inner position
ON : When completion of the disc
save operation
save operation
ON : When completion of the disc
chucking operation
chucking operation
ON : When the optical pick-up
is inner position
is inner position
ON : When completion of the disc
save operation
save operation
ON : When completion of the disc
chucking operation
chucking operation
RW SEL
EMPH
GRSCOR
GFS
CDDAT
CDCLK
CDLAT
SENS
SCOR
XRDE
XWRE
XQOK
SCLK
LIM SW
LOAD SW
SAVE SW
XRST
FOK
SQSO
SQCK
99
53
66
42
61
59
60
44
52
64
65
63
43
98
97
62
41
56
58
LOADF
LOADR
5
6
96
CD-ROM/RW
SELECT SWITCH
Q202
RF AMP OFFSET
CONTROL SWITCH
Q102
MUTING CONTROL
SWITCH
Q402
DOUTSEL 90
SW701
CN901 (1/2)
ANALOG
DIGITAL
OPTICAL
TRANSEIVER
IC701
DIGITAL OUT
IC701
• SIGNAL PATH
: CD PLAY (ANALOG OUT)
: CD PLAY (DIGITAL OUT)
X501
16.9344MHz
FILTER
DIGITAL SIGNAL PROCESSOR,
DIGITAL SERVO PROCESSOR,
D-RAM CONTROLLER
IC101
D-RAM
IC102
AUTOMATIC
POWER
CONTROL
Q101
RF AMP,
FOCUS/TRACKING ERROR AMP
IC101
6
SYSTEM CONTROLLER
IC201 (1/2)
DIGITAL FILTER,
D/A CONVERTER
IC501
VIN1-B
18
67
MUTE
MUTE
SECTION 6
DIAGRAMS
6-1.
BLOCK DIAGRAM – SERVO Section –
CDX-848X
20
20
6-2.
BLOCK DIAGRAM – BUS CONTROL/POWER SUPPLY Section –
RESET
SWITCH
7
DATA
CLK
BUSON
RST
5
4
6
2
B. UP
CONTROL
CN901 (2/2)
37
MCK
36
EHS
34
AVRH
ELVON
RV201
ELEVATOR HEIGHT
(ADDRESS)
RV202
ELEVATOR HEIGHT
SENSOR
24
+8V
REGULATOR
IC304
DRIVER +8V
BUCHK 46
BATTERY
CHECK
Q301
D306
D307
75
CDON 23
EJECT SW 50
B. UP +3.3V
BUS INTERFACE
(FOR SONY BUS)
IC302
+5V
REGULATOR
IC305
+3.3V
REGULATOR
Q303, 304
DAC/SERVO +5V
Z
SW801
51 MAGLK SW
4
ELVF
3
ELVR
SW201
MAGAZINE
DETECT
ON : When magazine
is set
is set
3
4
9
7
MOTOR
DRIVE
IN1
IN2
OUT1
OUT2
ELEVATOR
MOTOR DRIVE
IC301
M
M104
(ELEVATOR)
SYSTEM CONTROLLER
IC201 (2/2)
RESET
10
6
9
11
4
1
12
13
2
8
7
SO
SI
SCK
BUSON OUT
BUSON OUT
RESET
DATA
14
CLK
LOF
BUSON IN
RST
16
17
18
45
81
UNI SI
UNI SO
UNI CK
BUSON
VCC
RESET SIGNAL
GENERATOR
IC303
PS901
32
28
EEDAT
EECLK
5
6
SDA
SCL
EEPROM
IC203
+3.3V
REGULATOR
IC306
SERVO +3.3V
X1
80
X0
X201
4MHz
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