Sony DHC-EX77MD / DHC-MD77 / MDS-EX77 / MDS-EX770 Service Manual ▷ View online
– 29 –
5-7.
TRAVERSE (E-F BALANCE) ADJUSTMENT
Note 1: Data will be erased during MO reading if a recorded
disc is used in this adjustment.
Note 2: If the traverse waveform is not clear, connect the os-
cilloscope as shown in the following figure so that it
can be seen more clearly.
can be seen more clearly.
Connection:
8. Turning the SELECTOR knob so that the waveforms of the
oscilloscope becomes the specified value. (When the
SELECTOR knob is turned, the “
SELECTOR 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 satis-
fied as much as possible.
(MO write power traverse adjustment)
In this adjustment, waveform varies at intervals of approx.
2%. Adjust the waveform so that the specified value is satis-
fied as much as possible.
(MO write power traverse adjustment)
+
–
–
oscilloscope
(DC range)
10 pF
330 k
Ω
CN110 pin
3
(TEO)
CN110 pin
2
(VC)
BD board
+
–
–
BD board
CN110 pin
3
(TEO)
CN110 pin
2
(VC)
oscilloscope
(DC range)
V: 0.1 V/div
H: 10 ms/div
H: 10 ms/div
A
B
VC
specification: A=B
(Traverse Waveform)
9. Press the ENTER/YES button, and save the result of adjust-
ment to the non-volatile memory.
(“EFB=
(“EFB=
SAVE” will be displayed for a moment. Then
“EFB=
MO-P” will be displayed.)
10. The optical pick-up moves to the pit area automatically and
servo is imposed.
11. Turning the SELECTOR knob until the waveforms 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.
1. Connect an oscilloscope to CN110 pin
3 (TEO) and CN110
pin
2 (VC) of the BD board.
2. Load a MO disc (any available on the market). (Refer to note
1.)
3. Press the
0 button or ) button and move the optical
pick-up outside the pit.
4. Turning the SELECTOR knob and display “EFBAL AD-
JUST”.
5. Press the ENTER/YES button and display “EFB=
MO-R”.
(Laser power READ power/focus servo ON/tracking servo
OFF/spindle (S) servo ON)
OFF/spindle (S) servo ON)
6. Turning the SELECTOR knob so that the waveforms of the
oscilloscope becomes the specified value. (When
the SELECTOR knob is turned, the “
the SELECTOR 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.
(MO read power traverse adjustment)
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(MO read power traverse adjustment)
(Traverse Waveform)
A
B
VC
specification: A=B
Adjusting Method:
(Traverse Waveform)
A
B
VC
specification: A=B
12. Press the ENTER/YES button, and save the result of adjust-
ment to the non-volatile memory.
(“EFB=
(“EFB=
SAVE” will be displayed for a moment. Then
“EFBAL CD” will be displayed.)
The disc stops rotating automatically.
The disc stops rotating automatically.
13. Press the
§ EJECT button and remove the MO disc.
14. Load the test disc TDYS-1.
15. Press the ENTER/YES button and display “EFB=
15. Press the ENTER/YES button and display “EFB=
CD”.
Servo is imposed automatically.
16. Turning the SELECTOR knob until the waveforms 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.
17. Press the ENTER/YES button, and save the result of adjust-
ment to the non-volatile memory.
(“EFB=
(“EFB=
SAVE” will be displayed for a moment. Then
“EFBAL ADJUST” will be displayed.)
18. Press the
§ EJECT button and remove the test disc TDYS-1.
(Traverse Waveform)
A
B
VC
specification: A=B
7. Press the ENTER/YES button, and save the result of adjust-
ment to the non-volatile memory.
(“EFB=
(“EFB=
SAVE” will be displayed for a moment. Then
“EFB=
MO-W” will be displayed.)
– 30 –
5-8.
FOCUS BIAS ADJUSTMENT
Adjusting Method:
1. Load a continuously recorded disc (Refer to “5-4. Creating
1. Load a continuously recorded disc (Refer to “5-4. Creating
MO Continuously Recorded Disc”.).
2. Turning the SELECTOR knob and display “CPLAY MODE”.
3. Press the ENTER/YES button and display “CPLAY MID”.
4. Press the EDIT/NO button when “C1=
3. Press the ENTER/YES button and display “CPLAY MID”.
4. Press the EDIT/NO button when “C1=
AD= ” is dis-
played.
5. Turning the SELECTOR knob and display “FBIAS AD-
JUST”.
6. Press the ENTER/YES button and 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. Turning the SELECTOR knob in the clockwise direction and
find the focus bias value at which the C1 error rate becomes
220. (Refer to note 2.)
220. (Refer to note 2.)
8. Press the ENTER/YES button and display “
/
b=
”.
9. Turning the SELECTOR knob in the counterclockwise
derection and find the focus bias value at which the C1 error
rate becomes 220. (Refer to note 2.)
rate becomes 220. (Refer to note 2.)
10. Press the ENTER/YES button and display “
/
c=
”.
11. Check that the C1 error rate is below 50 and ADER is 00.
Then press the ENTER/YES button.
12. If the “(
)” in “
-
-
( )” is above 20, press the
ENTER/YES button.
If below 20, press the EDIT/NO button and repeat the ad-
justment from step 2 again.
If below 20, press the EDIT/NO button and repeat the ad-
justment from step 2 again.
13. Press the EDIT/NO button and press the
§ EJECT button
to remove the continuously recorded 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.
following figure using 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 us-
ing the average vale.
5-9.
ERROR RATE CHECK
5-9-1.
CD Error Rate Check
Checking Method:
1. Load a test disc TDYS-1.
2. Turning the SELECTOR knob and display “CPLAY MODE”.
3. Press the ENTER/YES button and display “CPLAY MID”.
4. “C1=
1. Load a test disc TDYS-1.
2. Turning the SELECTOR knob and display “CPLAY MODE”.
3. Press the ENTER/YES button and display “CPLAY MID”.
4. “C1=
AD=
” is displayed.
5. Check that the C1 error is below 20.
6. Press the EDIT/NO button, stop playback, press the
6. Press the EDIT/NO button, stop playback, press the
§ EJECT button, and remove the test disc.
5-9-2.
MO Error Rate Check
Checking Method:
1. Load a continuously recorded disc (Refer to “5-4. Creating
1. Load a continuously recorded disc (Refer to “5-4. Creating
MO Continuously Recorded Disc”.).
2. Turning the SELECTOR knob and display “CPLAY MODE”.
3. Press the ENTER/YES button and display “CPLAY MID”.
4. “C1=
3. Press the ENTER/YES button and display “CPLAY MID”.
4. “C1=
AD=
” is displayed.
5. If the C1 error is below 50, check that ADER is 00.
6. Press the EDIT/NO button, stop playback, press the
6. Press the EDIT/NO button, stop playback, press the
§ EJECT button, and remove the continuously recorded disc.
5-10. FOCUS BIAS CHECK
Change the focus bias and check the focus tolerance amount.
Checking Method:
1. Load a continuously recorded disc (Refer to “5-4. Creating
Checking Method:
1. Load a continuously recorded disc (Refer to “5-4. Creating
MO Continuously Recorded Disc”.).
2. Turning the SELECTOR knob and display “CPLAY MODE”.
3. Press the ENTER/YES button and display “CPLAY MID”.
4. Press the EDIT/NO button when “C1=
AD=
” is dis-
played.
5. Turning the SELECTOR knob and display “FBIAS CHECK”.
6. Press the ENTER/YES button and display “
6. Press the ENTER/YES button and 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 50 and ADER is 00.
after [/] indicate ADER, and the 2 digits after [c=] indicate the
focus bias value.
Check that the C1 error is below 50 and ADER is 00.
7. Press the ENTER/YES button and display “
/
b=
”.
Check that the C1 error is not below 220 and ADER is not
above 00 every time.
above 00 every time.
8. Press the ENTER/YES button and display “
/
a=
”.
Check that the C1 error is not below 220 and ADER is not
above 00 every time.
above 00 every time.
9. Press the EDIT/NO button, next press the
§ EJECT button,
and remove the continuously recorded disc.
Note 1: If the C1 error and ADER are above 00 at points a or b,
the focus bias adjustment may not have been carried out
properly. Adjust perform the beginning again.
properly. Adjust perform the beginning again.
C1 error
220
b
c
a
Focus bias value
(F. BIAS)
(F. BIAS)
– 31 –
– 32 –
IC171
IC121
IC101
RF
VC
TEO
IOP
I+3V
CN110
1
5
CN101
D101
IC192
5-11.
ADJUSTING POINTS AND CONNECTING POINTS
[BD BOARD] (COMPONENT SIDE)
[BD BOARD] (CONDUCTOR SIDE)
•
Circuit Boards Location
SECTION 6
DIAGRAMS
SW board
BD board
MAIN board
REC VOL board
PANEL board
– 33 –
– 34 –
6-1.
BLOCK DIAGRAM (1/2)
MDS-EX77
CLTV
FILO
FILI
A
B
OVER WRITE
HEAD DRIVE
Q181, 182
OVER WRITE
HEAD DRIVE
IC181
Q180
HR901
OVER WRITE
HEAD
1
2
RF AMP
TEMP
AMP
I-V
AMP
LD/PD
AMP
I
J
48
47
MORFO
MORFI
RFO
46
40
RF AGC
AGCI
EQ
38
RF
EQ
WBL
37
62
PEAK
PEAK
33
66
AUX
AUX1
ABCD
ABCD
34
65
FE
FE
26
74
TE
TE
28
73
SE
SE
36
63
BOTM
BOTM
PEAK &
BOTTOM
3T
BAND-PASS
FILTER
15
14
VCC
TEMPR
TEMPI
D101
4
5
8
9
A
B
C
D
DETECTOR
J
I
F
E
I
J
B
A
C
D
E
D
E
F
35
ABCD AMP
FOCUS
ERROR AMP
TRACKING
ERROR AMP
64
32
78
ADFG
ADFG
I-V
AMP
AT AMP
WBL
BAND-PASS
FILTER
29
30
ADIN
ADFM
20
79
F0CNT
F0CNT
16
82
SWDT
DTRF
17
81
SCLK
CKRF
18
80
XLAT
XLRF
SERIAL/
PARALLEL
CONVERTER,
DECODER
COMMAND
AUTOMATIC
POWER CONTROL
Q162, 163
LASER ON
SWITCH
Q101
11
10
PD
LD
ILCC
PD
LASER
DIODE
DIODE
APC
PD
12
APCREF
RF AMP,
FOCUS/TRACKING
ERROR AMP
IC101
OPTICAL PICK-UP BLOCK
(KMS-260A/J1N)
A
B
C
D
D
6
7
BUFFER
IC122
SPINDLE
MOTOR
DRIVE
3
4
M
6
8
OUT4F
OUT4R
IN4F
IN4R
1
2
29
30
M
27
25
OUT2F
OUT2R
IN2F
IN2R
3
4
19
21
OUT1F
OUT1R
IN1F
IN1R
5
6
OUT3F
OUT3R
IN3F
IN3R
7
8
SLED
MOTOR
DRIVE
SLED/SPINDLE MOTOR DRIVE,
FOCUS/TRACKING COIL DRIVE
IC152
HF MODULE
SWITCH
IC103, Q102-104
FCS+
FCS–
TRK+
TRK–
(FOCUS)
(TRACKING)
TRACKING
COIL
DRIVE
12
10
14
15
WRPWR
MOD
MOD
23
18
FOCUS
COIL
DRIVE
HF
MODULE
V-I
CONVERTER
WBL
3T
EQ
M901
(SPINDLE)
M902
(SLED)
55
52
COMPA-
RATOR
RFI
ASYI
51
ASYO
61
60
59
58
100
PLL
FILTER
PCO
EFMO
ANALOG MUX
SERVO
DIGITAL
SIGNAL
PROCESS
AUTOMATIC
POWER
CONTROL
94
1
SPFD
93
2
SPRD
SPINDLE
SERVO
AUTO
SEQUENCER
92
3
SFDR
91
4
SRDR
88
5
FFDR
89
6
FRDR
86
7
TFDR
85
8
TRDR
PWM GENERATOR
A/D CONVERTER
SAMPLING RATE
CONVERTER
CPU
INTERFACE
MONITOR
CONTROL
CONTROL
MNT3
MNT2
MNT1
4
3
2
1
MNT0
SCLK
SWDT
SRDT
6
5
8
9
SENS
XLAT
7
DQSY
12
11
SQSY
14
XINT
24
DADT
22
DOUT
21
DIN
LRCK
25
26
XBCK
OSCO
17
OSCI
SUBCODE
PROCESSOR
EFM/ACIRC
ENCODER/DECODER
ADIP
DEMODULATOR/
DECODER
SHOCK PROOF
MEMORY CONTROLLER
ATRAC ENCODER/DECODER
DIGITAL SERVO SIGNAL PROCESSOR,
DIGITAL SIGNAL PROCESSOR,
EFM/ACIRC ENCODER/DECODER,
SHOCK PROOF MEMORY CONTROLLER,
ATRAC ENCODER/DECODER
IC121
DIGITAL
AUDIO
INTERFACE
13
RECP
10
XRST
83
APCREF
15
23
ADDT
BCK
LRCK
LOADING
MOTOR
DRIVE
6
5
M
10
2
OUT
(R)
OUT
(F)
REV
IN
FWD
IN
M903
(LOADING)
94
95
LDOUT
LDIN
4
CLAMP
REFERENCE
VOLTAGE SWITCH
Q311, 312
LOADING MOTOR DRIVE
IC311
42
41
33
77
67
68
69
32
90
16
15
12
MNT3
MNT2
SHOCK
FOK
SCLK
SWDT
SRDT
SENS
XLATCH
DQSY
SQSY
XINT
SLOCK
XBUSY
39 LD LOW
81 DIG-RST
80 WRPWR
86 MOD
75 LDON
SYSTEM
CONTROLLER
(MECHANISM CONTROL)
IC401(1/2)
89
35
SCTX
CD/VIDEO
DIGITAL INPUT
SELECTOR
IC304
WAVE SHAPER
IC303
OPTICAL
INPUT
IC301
OPTICAL
INPUT
IC302
ADDT
DADT
16
SWDT, SCLK, LATCH
LRCK, BCK
512FS
38
PB-P
S687
(PB POSITION)
37
REC-P
S688
(REC POSITION)
6
CHACK-IN
S685
(CHACKING IN)
7
PACK-IN
8
PACK-OUT
S686
(PACK OUT)
98
REFLECT
S682
(REFLECT)
97
PROTECT
S683
(PROTECT)
96
LIMIT-IN
S681
(LIMIT IN)
+5V
52
SDA
5 SDA
53
SCL
6 SCL
EEPROM
IC171
TX
E
F
2-AXIS
DEVICE
05
PSB
E
16
CLOCK
GENERATOR
512FS
BUFFER
IC123
SWDT
SCLK
LATCH
D
C
MDS-EX77
MD DIGITAL
OPTICAL
DIGITAL IN
CD PLAYER
MD DIGITAL
OPTICAL
DIGITAL IN
VIDEO 2
•
SIGNAL PATH
: PLAY
: REC
: PLAY (DIGITAL OUT)
: REC (DIGITAL IN)
: REC
: PLAY (DIGITAL OUT)
: REC (DIGITAL IN)
Click on the first or last page to see other DHC-EX77MD / DHC-MD77 / MDS-EX77 / MDS-EX770 service manuals if exist.