Sony MDS-JB940 Service Manual ▷ View online
29
+
–
–
Oscilloscope
(DC range)
V: 0.1 V/div
H: 10 ms/div
H: 10 ms/div
BD board
CN105 pin 4 (TE)
CN105 pin 6 (VC)
CN105 pin 6 (VC)
5-12.
TRAVERSE ADJUSTMENT
Connection:
Adjusting Procedure:
1.
1.
Connect an oscilloscope to CN105 pin 4 (TE) and CN105
pin 6 (VC) on the BD board.
pin 6 (VC) on the BD board.
2.
Load a recordable test disc (MDW-74/GA-1).
3.
Press the M button to move the optical pick-up outside the
pit.
pit.
4.
Turn the l AMS L knob to display “EF MO ADJUS”
(C07).
(C07).
5.
Press the YES button to display “EFB =
MO-R”.
6.
Turn the l AMS L knob so that the waveform of the
oscilloscope becomes the specified value.
(When the l AMS L knob is turned, the
oscilloscope becomes the specified value.
(When the l AMS L knob is turned, the
of “EFB=
MO-R” changes and the waveform changes.) In this
adjustment, waveform varies at intervals of approx. 2%. Adjust
the waveform so that the specified value is satisfied as much as
possible.
the waveform so that the specified value is satisfied as much as
possible.
Traverse Waveform
7.
Press the YES button and save the result of adjustment to the
non-volatile memory (“EFB =
non-volatile memory (“EFB =
SAV” will be displayed for a
moment. Then “EFB =
MO-W” will be displayed).
8.
Turn the l AMS L knob so that the waveform of the
oscilloscope becomes the specified value.
(When the l AMS L knob is turned, the
oscilloscope becomes the specified value.
(When the l AMS L knob is turned, the
of “EFB-
MO-W” changes and the waveform changes.) In this
adjustment, waveform varies at intervals of approx. 2%. Adjust
the waveform so that the specified value is satisfied as much as
possible.
the waveform so that the specified value is satisfied as much as
possible.
Traverse Waveform
9.
Press the YES button, and save the adjustment results in the
non-volatile memory. (“EFB =
non-volatile memory. (“EFB =
SAV” will be displayed for
a moment)
10. “EFB =
MO-P” will be displayed.
The optical pick-up moves to the pit area automatically and
servo is imposed.
servo is imposed.
11. Turn the l AMS L knob until the waveform of the
oscilloscope moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
Traverse Waveform
12. Press the YES button, and save the adjustment results in the
non-volatile memory. (“EFB =
SAV” will be displayed for
a moment.)
Next “EF MO ADJUS” is displayed. The disc stops rotating
automatically.
Next “EF MO ADJUS” is displayed. The disc stops rotating
automatically.
13. Press the EJECT A button and take out the disc.
14. Load the check disc (MD) TDYS-1.
15. Turn the l AMS L knob to display “EF CD ADJUS”
14. Load the check disc (MD) TDYS-1.
15. Turn the l AMS L knob to display “EF CD ADJUS”
(C08).
16. Press the YES button to display “EFB =
CD”. Servo is
imposed automatically.
17. Turn the l AMS L knob so that the waveform of the
oscilloscope moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
Traverse Waveform
18. Press the YES button, display “EFB =
SAV” for a moment
and save the adjustment results in the non-volatile memory.
Next “EF CD ADJUS” will be displayed.
Next “EF CD ADJUS” will be displayed.
19. Press the EJECT A button and take out the test disc TDYS-1.
A
B
VC
Specification A = B
A
B
VC
Specification A = B
A
B
VC
Specification A = B
A
B
VC
Specification A = B
30
5-13.
FOCUS BIAS ADJUSTMENT
Adjusting Procedure :
1.
1.
Load the continuously-recorded disc (MDW-74/GA-1).
(Refer to “5-5. Creating Continuously-Recorded Disc”)
(Refer to “5-5. Creating Continuously-Recorded Disc”)
2.
Turn the l AMS L knob to display “CPLAY 1 MODE”
(C34).
(C34).
3.
Press the YES button to display “CPLAY 1 MID”.
4.
Press the MENU/NO button when “C =
AD =
” is
displayed.
5.
Turn the l AMS L knob to display “FBIAS ADJUS”
(C09).
(C09).
6.
Press the YES button to display “
/
a =
”.
The first four digits indicate the C1 error rate, the two digits
after [/] indicate ADER, and the 2 digits after [a =] indicate the
focus bias value.
after [/] indicate ADER, and the 2 digits after [a =] indicate the
focus bias value.
7.
Turn the l AMS L knob clockwise and find the focus
bias value at which the C1 error rate becomes about 200.
bias value at which the C1 error rate becomes about 200.
8.
Press the YES button to display “
/
b =
”.
9.
Turn the l AMS L knob counterclockwise and find
the focus bias value at which the C1 error rate becomes about
200. The C1 error rate must be almost same as the value set at
step 7.
the focus bias value at which the C1 error rate becomes about
200. The C1 error rate must be almost same as the value set at
step 7.
10. Press the YES button to display “
/
c =
”.
11. Check that the C1 error rate is below 20 and ADER is 00. Then
press the YES button.
12. If the “(
)” in “
-
-
(
)” is above 20, press the YES
button.
If below 20, press the MENU/NO button and repeat the
adjustment from step 2.
If below 20, press the MENU/NO button and repeat the
adjustment from step 2.
13. Press the EJECT A button and take out the disc.
Note 1: The relation between the C1 error and focus bias is as shown in the
following figure. Find points A and B in the following figure using
the above adjustment. The focal point position C is automatically
calculated from points A and B.
the above adjustment. The focal point position C is automatically
calculated from points A and B.
Note 2: As the C1 error rate changes, perform the adjustment using the
average value.
5-14.
ERROR RATE CHECK
5-14-1. CD Error Rate Check
Checking Procedure :
1.
Checking Procedure :
1.
Load the check disc (MD) TDYS-1.
2.
Turn the l AMS L knob and display “CPLAY 1
MODE” (C34).
MODE” (C34).
3.
Press the YES button and display “CPLAY 1 MID”.
4.
The display changes to “C =
AD =
”.
5.
Check that the C1 error rate is below 20.
6.
Press the MENU/NO button to stop playback, then press the
EJECT A button and take out the check disc.
EJECT A button and take out the check disc.
5-14-2. MO Error Rate Check
Checking Procedure :
1.
Checking Procedure :
1.
Load the continuously-recorded disc (MDW-74/GA-1). (Refer
to “5. Creating Continuously-Recorded Disc”)
to “5. Creating Continuously-Recorded Disc”)
2.
Turn the l AMS L knob to display “CPLAY 1 MODE”
(C34).
(C34).
3.
Press the YES button to display “CPLAY 1 MID”.
4.
The display changes to “C1 =
AD =
”.
5.
If the C1 error rate is below 20, check that ADER is 00.
6.
Press the MENU/NO button to stop playback, then press the
EJECT A button and take out the test disc.
EJECT A button and take out the test disc.
5-15.
FOCUS BIAS CHECK
Change the focus bias and check the focus tolerance amount.
Checking Procedure :
1.
1.
Load the continuously-recorded disc (MDW-74/GA-1). (Refer
to “5. Creating Continuously-Recorded Disc”)
to “5. Creating Continuously-Recorded Disc”)
2.
Turn the l AMS L knob to display “CPLAY 1 MODE”
(C34).
(C34).
3.
Press the YES button twice to display “CPLAY 1 MID”.
4.
Press the MENU/NO button when “C =
AD =
” is
displayed.
5.
Turn the l AMS L knob to display “FBIAS CHECK”
(C16).
(C16).
6.
Press the YES button to display “
/
c =
”.
The first four digits indicate the C1 error rate, the two digits
after [/] indicate ADER, and the 2 digits after [c =] indicate the
focus bias value.
Check that the C1 error is below 20 and ADER is below 2.
after [/] indicate ADER, and the 2 digits after [c =] indicate the
focus bias value.
Check that the C1 error is below 20 and ADER is below 2.
7.
Press the YES button and display “
/
b =
”.
Check that the C1 error is about 100 and ADER is below 2.
8.
Press the YES button and display “
/
a =
”.
Check that the C1 error is about 100 and ADER is below 2
9.
Press the MENU/NO button, then press the EJECT A button
and take out the disc.
and take out the disc.
Note:
If the C1 error rate and ADER are above other than the specified
value at points a (step 8. in the above) or b (step 7. in the above),
the focus bias adjustment may not have been carried out properly.
Perform the adjustment from the beginning again.
value at points a (step 8. in the above) or b (step 7. in the above),
the focus bias adjustment may not have been carried out properly.
Perform the adjustment from the beginning again.
5-16.
AUTO GAIN CONTROL OUTPUT LEVEL
ADJUSTMENT
ADJUSTMENT
Be sure to perform this adjustment when the optical pick-up is
replaced.
If the adjustment results becomes “Adjust NG!”, the optical pick-
up may be faulty or the servo system circuits may be abnormal.
replaced.
If the adjustment results becomes “Adjust NG!”, the optical pick-
up may be faulty or the servo system circuits may be abnormal.
5-16-1. CD Auto Gain Control Output Level Adjustment
Adjusting Procedure :
1.
Adjusting Procedure :
1.
Load the check disc (MD) TDYS-1.
2.
Turn the l AMS L knob to display “AG Set (CD)”
(C11).
(C11).
3.
When the YES button is pressed, the adjustment will be
performed automatically.
“Complete!!” will then be displayed momentarily when the
value is recorded in the non-volatile memory, after which the
display changes to “AG Set (CD)”.
performed automatically.
“Complete!!” will then be displayed momentarily when the
value is recorded in the non-volatile memory, after which the
display changes to “AG Set (CD)”.
4.
Press the EJECT A button and take out the check disc.
5-16-2. MO Auto Gain Control Output Level Adjustment
Adjusting Procedure :
1.
Adjusting Procedure :
1.
Load the test disc (MDW-74/GA-1).
2.
Turn the l AMS L knob to display “AG Set (MO)”
(C10).
(C10).
3.
When the YES button is pressed, the adjustment will be
performed automatically.
“Complete!!” will then be displayed momentarily when the
value is recorded in the non-volatile memory, after which the
display changes to “AG Set (MO)”.
performed automatically.
“Complete!!” will then be displayed momentarily when the
value is recorded in the non-volatile memory, after which the
display changes to “AG Set (MO)”.
4.
Press the EJECT A button and take out the test disc.
MDS-JB940
31
31
SECTION 6
DIAGRAMS
6-1. BLOCK DIAGRAM MAIN Section
OVER WRITE
HEAD DRIVE
Q181,182
OVER WRITE
HEAD DRIVE
IC181
C
B
A
D
I
J
F
E
LASER ON
SWITCH
Q101
Q121,122
AUTOMATIC
POWER
CONTROL
HF
MODULE
DETECTOR
OPTICAL PICK-UP BLOCK
(KMS-260B/J1N)
I
J
A
B
D
C
LASER ON
DIODE
ILCC
PD
VR
SLED
MOTOR
DRIVE
SPINDLE
MOTOR
DRIVE
FOCUS
COIL
DRIVE
TRACKING
COIL
DRIVE
6
OUT 4F
8
OUT 4R
15
IN 3R
16
PSB
27
OUT 2F
25
OUT 2R
23
OUT 1R
10
OUT 3R
21
OUT 1F
12
OUT 3F
14
IN 3F
19
IN 1F
29
IN 2F
3
IN 4F
18
IN 1R
30
IN 2R
4
IN 4R
FOCUS
COIL
TRACKING
COIL
SPINDLE
MOTOR
SLED
MOTOR
M901
M902
2-AXIS
DEVICE
16
FCS+
FCS
TRK+
TRK
MOD
HF MODULE
SWITCH
Q131-134
MOD
WRPWM
A+3V
VC
K
VCC
VC
SPINDLE/SLED MOTOR DRIVE,
FOCUS/TRACKING COIL DRIVE
IC152
HR901
OVER WRITE
HEAD
PD
LD
• Signal Path
: PB (Digital out)
: REC (Digital in)
: PB
: PB
:REC
E
F
M
M
WAVEFORM
SHAPPER
IC102
4
2
PD
10
APC
11
C
6
D
7
E
8
A
4
B
5
F
9
J
2
I
1
IC101
RF AMP
DSP
IC151(1/2)
EFMO
100
TX
15
RFI
57
38
RF
SPFD
94
PEAK
63
37
PEAK
BOTM
64
36
BOTM
AUX1
67
33
AUX
ABCD
65
35
ABCD
FE
66
34
FE
SE
74
28
SE
TE
75
26
TE
ADFG
78
32
ADFG
FOCNT
79
20
FOCNT
DTRF
82
16
SWDT
CKRF
81
17
SCLK
XLRF
80
18
XLAT
APCREF
83
12
APCREF
SPRD
93
SFDR
92
SRDR
91
FFDR
88
FRDR
89
TFDR
86
TRDR
85
10
RST
13
RECP
19
DIN0
21
DOUT
25
ADDT
26
DADT
28
XBCK
27
LRCK
16
OSCI
2
6
IC171
DQ1
DQ4
A0
A9
RAS
4
DRAM
IC153
IC153
47
XWE
43
XOE
44
XCAS
46
XRAS
34
31
36
.
40
45
.
AO0
AO9
9
12
14
.
18
5
.
1
2
24
25
.
.
.
WE
3
OE
22
CAS
23
DO0
DO3
49
48
50
51
.
.
.
DIG RST
47
WRPWR
35
MOD
14
IOP
133
LDON
29
RXO
45
TXO
44
22
DADTI
SYSTEM CONTROL
IC1(1/2)
CLKO
46
24
XBCKI
LRCK
34
23
LRCKI
MNT1
58
2
MNT1
MNT2
56
3
MNT2
SRDT
40
8
SRDT
SENS
48
9
SENS
SWDT
38
5
SWDT
SCLK
42
6
SCLK
XLATCH
50
7
XLAT
SQSY
27
11
SQSY
DQSY
25
12
DQSY
XINT
32
14
XINT
126
OPT1/OPT1
127
COAX/OPT
9
RESET
7
14
6
5
4
3
2
A
B
IC300
DIGITAL
INPUT
3
IC303
13
12
IC301
IN1
11
10
IC301
DIGITAL
INPUT
3
IC302
1
2
IC301
IN2
3
4
IC301
OPTICAL
5
6
IC301
9
8
IC301
COAXIAL
IN
J300
COAXIAL
OUT
J301
T301
7
1
IC305
DIGITAL
OUTPUT
1
IC304
OPTICAL
OUT
5
3
IC305
DIGITAL
A/D CONV
IC603
SDTO
13
BICK
12
LRCK
11
CDTI
15
CCLK
16
CS
17
PD
19
VTI
9
D/A CONV
IC201
DATAI
48
44
LVCKO2
BCKI
49
LRCK
50
SC DATA
33
SHIFT
32
LVCKO1
45
10
A/D LATCH
43
REC SW
INIT
30
LATCH
31
125
D/A LATCH
VC
68
VC
7
5
IC602
IC205
2
AINR
3
AINL
1
L1(-)
1
3
IC602
6
L2(+)
IC205
3
L1(+)
8
L2(-)
LPF
LPF
IC206
AMP
IC206
LPF
MUTE
Q201,203
IC255
22
R1(+)
17
R2(-)
IC255
24
R1(-)
19
R2(+)
LPF
LPF
IC256
AMP
IC256
LPF
MUTE
Q200,202
J200
PHONE
LEVEL
RV801
3
5
1
7
HP
AMP
IC802
MUTE
Q801
MUTE
Q802
PHONES
J802
L
R
L
R
IN
OUT
ANALOG
12
LD IN
13
LD OUT
MOTOR
DRIVE
5
6
10
2
M
IC451
LOADING
MOTOR
M103
S105
REC
S104
PLAY
S103
OUT
S102
PROTECT
S101
LIMIT IN
49
PLAY SW
51
OUT SW
30
LIMIT IN
67
REFRECT SW
68
PROTECT SW
REF VOL
SWITCH
Q451,452
39
LD LOW
8
MUTE
26
P DOWN
4
D412
A
POWER
SECTION
+5V
REG
1
2
IC190
LD+3.3V
A+3.3V
D+3.3V
+5V
MUTE CONT
Q401
61
SDA
66
SCL
60
EEP WP
IC195
EEPROM
SDA
5
SCL
6
WP
7
P DOWN
MDS-JB940
32
32
6-2. BLOCK DIAGRAM DISPLAY/POWER Section
COM01
COM22
FLOURESCENT
INDICATOR TUBE
DISPLAY CONTROL
AC
AC
FUCTION
KEY
REC VOL A
118
REC VOL B
117
SIRCS
4
RV760
VOLUME
X1
10MHz
FL781
39
60
74
FILTER
75
SF EDIT
72
MD LONG
LED
DRIVER
KEY1
139
22
XIN
20
XOUT
D918-921
D404-407
AC
AC
A
MAIN
SECTION
P DOWN
FUCTION
KEY
KEY0
141
S711,712
S714,716,717
FUCTION
KEY
KEY2
138
S721-725
ROTARY
ENCODER
JOG0
123
S713
REMOTE
CONTROL
RECEIVER
1
2
IC761
+3.3V
+5V
REG
1
2
IC902
-7V
REG
2
1
IC402
TR900
D904-907
RELAY
DRIVE
Q901
RY901
IC1(2/2)
S701-706
JOG1
124
SEG01
SEG39
FL DRIVER
IC771
73
POWER
Q756-759
D756-759
+7V
REG
3
1
IC401
KEYBOARD
J801
6
2
5
1
4
3
CONTROL
A1 II
+5V
BUFFER
Q3,4
BUFFER
Q1,2
Q5
J321
Q321
IIC CLK
36
IIC DATA
37
KEYBOARD DATA
116
KEYBOARD CLK
28
KEYBOARD CLK CTRL
114
A1 IN
3
A1 OUT
31
1
DATA(FL)
2
CLK(FL)
128
CS(FL)
FUCTION
KEY
KEY3
137
S731-733
TIMER
TIMER
136
S751
X2
32.768kHz
18
CLOCK OUT
17
CLOCK IN
A0
A18
31
.
29
33
.
35
.
38
.
40
.
42
.
44
.
32
.
30
34
.
36
.
39
.
41
.
43
.
45
.
92
85
77
.
75
.
.
100
94
.
122
119
131
102
.
73
3
37
79
.
80
.
1
.
2
.
8
1
48
.
17
.
.
25
18
.
16
DQ0
DQ15
A1
A19
D0
D15
FLASH ROM
IC2
WE
11
WP
14
CE
26
OE
28
65
WE R/W
90
WP
69
CS0
63
OE
131
STB
19
S RESET
RESET
67
DA
70
CP
69
CS
68
GRID BUFF
Q781,782
61
COM23
62
COM24
63
VFL1
FL-32V
AC
IN
T901
POWER
TRANSFORMER
LINE
FILTER
LF901
D903
D902
-32V REG
Q902
+3.3V REG
Q904
REGULATOR
IC400
7
VCC2
2
AC
6
VCC1
PH5V
5
P DOWN
13
ANA5V
4
+3V REG
Q405
SYS3.3V
8
SRST
10
D401
D402
D403
BT701
LITHIUM ION
BATTERY
D/A +5V
PANEL +5V
AD/DA +3V
OPT +3V
SYS +3.3V
B-UP +3.3V
FL -32V
D911
D910
4
+5V
REG
1
2
IC203
4
+5V
REG
1
2
IC601
4
MOTOR +5V
HEAD +5V
MDM +5V
+7V
D/A +5V
A/D +5V
-7V
LOADING
MOTOR +B
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