Sony CX-JTV8 / JAX-TV8 Service Manual ▷ View online
21
CX-JTV8
SECTION 5
ELECTRICAL ADJUSTMENTS
– BD BOARD (Conductor Side) –
TP70
(TE)
TP68
(FE)
TP71
(RFDC)
TP73
(DVC)
TP72
(RFAC)
Note:
Clear RF signal waveform means that the shape “
◊ ” can be clearly
distinguished at the center of the waveform.
TRAVERSE LEVEL CHECK
Procedure :
1. Connect an oscilloscope to TP70 (TE) and TP73 (DVC) on the
1. Connect an oscilloscope to TP70 (TE) and TP73 (DVC) on the
BD board.
2. Press the
[POWER]
key to turn the power ON.
3. Load a disc (LUV-P01) and playback the number nine track.
4. Press the
4. Press the
Y
key. (Becomes the 1 track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscillo-
scope waveform.
Connecting Location:
Note:
1.
CD Block is basically designed to operate without adjustment. Therefore,
check each item in order given.
check each item in order given.
2.
Use LUV-P01 (Part No. 4-999-032-01) unless otherwise indicated.
3.
Use an oscilloscope with more than 10M
Ω impedance.
4.
Clean the object lens by an applicator with neutral detergent when the
signal level is low than specified value with the following checks.
signal level is low than specified value with the following checks.
S-CURVE CHECK
Procedure :
1. Connect an oscilloscope to TP68 (FE) and TP73 (DVC) on the
1. Connect an oscilloscope to TP68 (FE) and TP73 (DVC) on the
BD board.
2. Press the
[POWER]
key to turn the power ON.
3. Load a disc (LUV-P01) and actuate the focus search. (In conse-
quence of open and close the disc tray, actuate the focus search)
4. Confirm that the oscilloscope waveform (S-curve) is symmetri-
cal between A and B. And confirm peak to peak level within 2
±
0.5 Vp-p.
Note:
• Try to measure several times to make sure than the ratio
of A : B or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the
brightness to obtain best waveform.
RF LEVEL CHECK
Procedure :
1. Connect an oscilloscope CH1 to TP71 (RFDC), CH2 to TP72
1. Connect an oscilloscope CH1 to TP71 (RFDC), CH2 to TP72
(RFAC) and TP73 (DVC) on the BD board.
2. Press the
[POWER]
key to turn the power ON.
3. Load a disc (LUV-P01) and playback the number nine track.
4. Confirm that oscilloscope waveform is clear and check if RF
4. Confirm that oscilloscope waveform is clear and check if RF
signal level is correct or not.
level=1.2
±
0.55Vp-p
symmetry
A (DC voltage)
center of
waveform
waveform
B
DVC
1 track jump waveform
TP70 (TE)
TP73 (DVC)
BD board
+
–
–
oscilloscope
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
level : 0.75
±
0.1Vp-p (RFDC)
1.05
±
0.3Vp-p (RFAC)
+
–
–
oscilloscope
TP71 (RFDC)
TP72 (RFAC)
BD board
TP73 (DVC)
symmetry
S-curve waveform
within 2
±
0.5Vp-p
A
B
+
–
–
oscilloscope
BD board
TP68 (FE)
TP73 (DVC)
CD SECTION
22
CX-JTV8
– VMP42DN BOARD (Component Side) –
TP70
(54 MHz)
TP182
(4.2336 MHz)
TP415
(L-OUT)
TP413
(R-OUT)
VIDEO SECTION
AUDIO LEVEL/VIDEO CLOCK/AUDIO SERVO
CLOCK CHECK
CLOCK CHECK
Procedure :
1. Connect an oscilloscope to TP308 (V-OUT) on the VMP42DN
1. Connect an oscilloscope to TP308 (V-OUT) on the VMP42DN
board.
2. Connect a level meter to TP415 (L-OUT) and TP413 (R-OUT)
on the VMP42DN board.
3. Connect a frequency counter to TP70 (54 MHz) and TP182
(4.2336 MHz) on the VMP42DN board.
3. Press the
[POWER]
key to turn the power ON.
4. Set a test disc (HLV-402 (Part No. 8-909-870-00))
5. Set to the MPEG AV TEST mode. (Refer to the CD SERVICE
5. Set to the MPEG AV TEST mode. (Refer to the CD SERVICE
MODE (See page 20))
6. The message “MPEG AV” is displayed on the flourescent in-
dicator tube. Color bar signal outputs and sine-wave (1 kHz
0dB) appears.
0dB) appears.
7. Confirm that the value of level meter is 2.5
± 2.0 dBs. (If audio
output disappear, press the
[HEAVY]
key, and the message
“SERVICE” is displayed on the flourescent indicator tube)
8. Confirm that the value of frequency counter is 54 MHz
± 400
Hz.
9. Confirm that the value of frequency counter is 4,2336 MHz.
10. Change disc to a MP3 test disc (MP3 1kHz 0dB sine-wave is
10. Change disc to a MP3 test disc (MP3 1kHz 0dB sine-wave is
recorded)
11. Confirm that the value of level meter is 2.4
± 2.0 dBs.
+
–
–
level meter
VMP42DN board
TP415 (L-OUT)
TP413 (R-OUT)
VMP42DN board
TP70 (54 MHz)
TP182 (4.2336 MHz)
+
–
–
frequency counter
CX-JTV8
23
23
SECTION 6
DIAGRAMS
6-1.
BLOCK DIAGRAM – CD SERVO Section –
VO1–
VO1+
6
7
8
9
16
18
11
10
12
2
1
173
137 138
140 141
142 143
27
26
31
32
34
35
1
2
5
10
DETECTOR
A
B
C
D
RF
SUMMING
AMP
FOCUS
ERROR AMP
TRACKING
ERROR AMP
RFAC
FE
RF AMP,
FOCUS/TRACKING ERROR AMP
IC103
TE
E
F
F I-V AMP
E I-V AMP
AUTOMATIC
POWER
CONTROL
Q101
APC LD
AMP
LD
LD
PD
LASER DIODE
RFAC
164 FE
160 RFDC
162 TE
163 SE
DIGITAL SIGNAL PROCESSOR,
DIGITAL SERVO PROCESSOR
IC505 (1/2)
MDP
133
SFDR
IN3+
IN4
IN3–
VO3+
VO3–
IN2–
IN2+
IN1–
IN1+
SRDR
TFDR
TRDR
FFDR
FRDR
SSTP
135
VO4+
VO4–
M101
(SPINDLE)
MOTOR
DRIVE
MOTOR
DRIVE
VO2–
VO2+
M
M
M102
(SLED)
FOCUS/TRACKING COIL DRIVE,
SPINDLE/SLED MOTOR DRIVE
IC102
2-AXIS
DEVICE
(TRACKING)
(FOCUS)
OPTICAL PICK-UP
BLOCK
(A-MAX. 3)
SW
PD
55
56
47
52
168
170 171
169
FILTER
FILO
PCO
CLTV
FILI
EQ
IN
IN
3
4
EQ
AC
SUM
17
FEI
RF DC
AMP
28
RFDCO
29
RFDCI
COIL
DRIVE
COIL
DRIVE
D/A1
D/A3
D/A4
D/A2
D/A
CONVERTER
IC506
• SIGNAL PATH
: CD PLAY
• R-ch is omitted due to same as L-ch.
RFAC
VCA
(LIMIT)
When the optical
pick-up is inner
position
pick-up is inner
position
ON :
150
149
XTAO
XTAI
X501
33.8688MHz
RFC
26
FREQUENCY
SELECT SWITCH
Q102
93
91
88
124
PCMD
BCK
LRCK
C2PO
C2PO
111
102
109
113
DATA
CLOK
XLAT
SENS
96
126
98
114
SCOR
SQSO
L SQCK
L SCLK
131
121
105
GFS
L FOK
L CDXRST
189
XTSL
6
5
3
AO5
AO4
AO3
9
AO6
D/A4
D/A2
D/A1
D/A3
STBY
8
RST
4
CLK
DATA
LD
11
12
CLK
10
LD
DI
DATA
BCK
LRCK
C2PO
B
(Page 24)
DATA, BCK,
LRCK, C2PO
CONT
DATA
CLOK
XLAT
SENS
SCOR
SQSO
SQCK
SCLK
GFS
FOK
XRST
C
(Page 24)
A
(Page 24)
DATA, CLK, LD
E
(Page 24)
SYS RST
F
(Page 24)
DATA, CLOK, XLAT, SENS,
SCOR, SQSO, SQCK,
SCLK, GFS, FOK, XRST
15
23
96
I-CD NUMBER SENS
22
I-CDM SW
9
RIN
LM-R
4 OUT1
2 OUT2
M751
(LOADING)
M
LOADING MOTOR DRIVE
IC701
SYSTEM CONTROLLER
IC901 (1/4)
S751
OPEN/CLOSE
DETECT
OPEN
CLOSE
LEVEL SHIFT
Q731
TABLE ADDRESS
SENSOR
IC731
+
ROTARY
ENCODER
S711
7
FIN
LM-F
9
RIN
TM-R
4 OUT1
2 OUT2
M741
(TABLE)
M
TABLE MOTOR DRIVE
IC712
7
FIN
TM-F
LM-F, LM-R,
TM-F, TM-R
D
(Page 25)
DISC TRAY
ADDRESS DETECT
4
O-SYS-RES
CX-JTV8
24
24
6-2.
BLOCK DIAGRAM – AUDIO/VIDEO CD Section –
PROGRAM ROM
IC508
• SIGNAL PATH
: CD PLAY (AUDIO)
: CD PLAY (VIDEO)
DIGITAL FILTER,
D/A CONVERTER
IC504
MPEG VIDEO/AUDIO DECODER,
VIDEO SIGNAL ENCODER
IC505 (2/2)
7
8
VOUTL
VOUTR
1
2
3
DATA
BCK
LRCK
DRADR0 – DRADR10
DRDAT0 – DRDAT15
D0 – D15
D0 – D15
A0 – A10
A0 – A10
74
18
73 72 68
6
201
203
204
CPSIG
AUDDTO0
AUDBCK
AUDLRCK
16
MLCK
205
AUDXCLKO
14
13
15
DATA
CLK
LAT
30
29
26
GPIO14
GPIO13
GPIO11
28
GPIO12
34 – 37, 39 – 45
49 – 56, 59 – 66
23 – 26, 29 – 34, 22
A0 – A10
12 – 5, 27, 26, 31
D8 – D15
A10 – A17
23, 25, 4, 28, 29, 3, 2, 30
D0 – D7
DQ0 – DQ7
A0 – A9, A18
DQ0 – DQ15
ADDRESS BUS
DATA BUS
D-RAM
IC507
A0 – A10
13 – 15, 17 – 21
WE
24
OE
RAS
CAS
DRCAS
DRRAS
DRWEL
NVOEL
B.P.F.
LOW-PASS
FILER
IC102
IC102
70 76 77 78
DRDQM1
DRDQM0
DRBS
DRCK
13 14
GPIO1
GPIO0
15 19 18 16
GPIO3
GPIO4
GPIO5
GPIO2
• R-ch is omitted due to same as L-ch.
G
(Page 26)
CD-L
E
(Page 23)
DATA, CLK, LD
R-CH
2, 4, 5, 7, 8, 10, 11, 13, 42,
44, 45, 47, 48, 50, 51, 53
16
17
20
CLK
BA0
LDQM
38
15
UDQM
39
92
90
87
123
L CDDATA
L CDBCK
L CDLRCK
L CDC2PO
L CDC2PO
110
103
108
112
L DDAT
L DCLK
L XLAT
L SENS
L SENS
95
125
99
115
L SCOR
L SQSO
SQCK
SCLK
SCLK
132
120
106
L GFS
FOK
XRST
DATA
BCK
LRCK
C2PO
B
(Page 23)
DATA, BCK,
LRCK, C2PO
LRCK, C2PO
DATA
CLOK
XLAT
SENS
SCOR
SQSO
SQCK
SCLK
GFS
FOK
XRST
C
(Page 23)
DATA, CLOK, XLAT, SENS,
SCOR, SQSO, SQCK,
SCLK, GFS, FOK, XRST
SCOR, SQSO, SQCK,
SCLK, GFS, FOK, XRST
24 GPIO9
CONT
A
(Page 23)
81 SYSRST
SYS RST
F
(Page 23)
+3.3V
REGULATOR
Q581
CD +5V
5
VDD
6
VCC
DATA
CLK
LD
VIDEO AMP
IC307
SYNC BUFFER
Q301
6
OUT
5
OUTSAG
3
IN
2
STBY
VIDEO MUTING
CONTROL SWITCH
Q370
J310
VIDEO OUT
207
206
CLKB
CLKA
X502
27MHz
6 O-SYS-REQ
10 O-SYS-OK
7 I-SYS-CS
100 I-SYS-CLK
99 I-SYS-IN
98 O-SYS-OUT
SYSTEM CONTROLLER
IC901 (2/4)
74
O-VIDEO-MUTE
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