Sony DHC-MD333 / HCD-MD333 Service Manual ▷ View online
– 29 –
Procedure:
1. Connect oscilloscope to test point TP (RF).
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Adjust RV101 so that the waveform is clear.
1. Connect oscilloscope to test point TP (RF).
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Adjust RV101 so that the waveform is clear.
(Clear RF signal waveform means that the shape “
◊
” can be
clearly distinguished at the center of the waveform.)
5. After adjustment, check the RF signal level.
• RF signal
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
TIME/DIV: 500 nS
S Curve Check
Procedure :
1. Connect oscilloscope to test point TP (FEO).
2. Connect between test point TP (FOK) and Ground by lead wire.
3. Turn Power switch on.
4. Put disc (YEDS-18) in and turned Power switch on again and
1. Connect oscilloscope to test point TP (FEO).
2. Connect between test point TP (FOK) and Ground by lead wire.
3. Turn Power switch on.
4. Put disc (YEDS-18) in and turned Power switch on again and
actuate the focus search. (actuate the focus search when disc
table is moving in and out.)
table is moving in and out.)
5. Check the oscilloscope waveform (S-curve) is symmetrical be-
tween A and B. And confirm peak to peak level within 2.4 ± 0.7
Vp-p.
Vp-p.
S-curve waveform
6. After check, remove the lead wire connected in step 2.
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 bright-
ness to obtain best waveform.
RF Level Check
Procedure :
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that oscilloscope waveform is clear and check RF sig-
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. 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 distinguished at the center of the waveform.
RF signal waveform
CD SECTION
Note:
1. CD Block is basically designed 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 an oscilloscope with more than 10M
3. Use an oscilloscope with more than 10M
Ω
impedance.
4. Clean the object lens by an applicator with lens cleaning liquid
when the signal level is low than specified value with the fol-
lowing checks.
lowing checks.
5. Adjust the focus bias adjustment when optical block is replaced.
Focus Bias Adjustment
Perform this adjustment when the optical pick-up has been replaced
or repaired.
or repaired.
–
+
oscilloscope
BD (CD) board
TP (RF)
TP (VC)
TP (VC)
level : 1.3
±
0.3 Vp-p
–
+
oscilloscope
BD (CD) board
TP (FEO)
TP (VC)
TP (VC)
symmetry
A
B
within 2.4
±
0.7 Vp-p
–
+
oscilloscope
BD (CD) board
TP (RF)
TP (VC)
TP (VC)
level : 1.3
±
0.3 Vp-p
VOLT/DIV : 200 mV
TIME/DIV : 500 nS
TIME/DIV : 500 nS
– 30 –
Procedure :
1. Connect oscilloscpe to test point TP (TEO) on BD board.
2. Turn Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the “P (Pause)” button. (Becomes the 1 track jump mode)
5. Confirm that the oscilloscope waveform is symmetrical on the
1. Connect oscilloscpe to test point TP (TEO) on BD board.
2. Turn Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the “P (Pause)” button. (Becomes the 1 track jump mode)
5. Confirm that the oscilloscope waveform is symmetrical on the
top and bottom in relation to 0Vdc, and check this level.
1 track jump waveform
E-F Balance (1 Track Jump) Check
(Without remote commander)
(Without remote commander)
Specified level: • x 100 = less than ± 7%
• A + B = 300 ± 100 mVp-p
6. Remove the lead wire connected in step 1.
Focus/Tracking Gain Adjustment (RV102, RV103)
This gain has a margin, so even if it is slightly off.
There is no problem.
Therfore, do not perform this adjustment.
Please note that it should be fixed to mechanical center position
when you moved and do not know original position.
There is no problem.
Therfore, do not perform this adjustment.
Please note that it should be fixed to mechanical center position
when you moved and do not know original position.
A – B
2 (A + B)
Adjustment Location:
[BD (CD) BOARD] — Component Side —
–
+
oscilloscope
BD (CD) board
TP (TEO)
TP (VC)
TP (VC)
A
B
0V
LEVEL : 300
±
100 mVp-p
RF
RV101
(Focus Bias Adjust)
RV103
TEO
VC
FEO
RV102
TEI
FEI
FOK
IC101
IC104
GND
PCK
IC102
HCD-MD333
– 31 –
SECTION 7
DIAGRAMS
7-1. CIRCUIT BOARDS LOCATION
MAIN board
PANEL board
MD LED board
HP board
AUDIO board
POWER AMP board
ENCAPSULATED COMPONENT
(US, Canadian, Malaysia, Singapore,
HongKong, Argentine, Australian, Tourist)
(US, Canadian, Malaysia, Singapore,
HongKong, Argentine, Australian, Tourist)
TUNER (FM/MW/LW) (AEP, UK, EE)
TRANS board
ST TERMINAL board
BD (CD) board
LOADING board
BD (MD) board
SW board
JACK board
HCD-MD333
– 33 –
– 34 –
7-2. BLOCK DIAGRAMS
– CD SECTION –
25
SLED MOTOR
DRIVE
26
•
27
16
M
SLO
M102
SLED MOTOR
4
SPINDLE MOTOR
DRIVE
1
•
2
M
M101
SPINDLE
MOTOR
SLED/SPINDLE
MOTOR DRIVE
IC102 (2/2)
14
SL+
SLED
SERVO
IC101 (2/2)
19
TRACKING
COIL DRIVE
18
17
T+
T–
9
FOCUS
COIL DRIVE
12
11
F–
F+
2-AXIS
DEVICE
TRACKING
COIL
FOCUS
COIL
TRACKING/FOCUS
COIL DRIVE
IC102 (1/2)
7
XRST
22
XRST
TRACKING/FOCUS SERVO,
RF AMP
IC101 (1/2)
PD1
PD2
35
36
4
2
1
5
10
6
F
E
38
39
E
A
B
C
D
F
B+
K
A
D
C
B
DETECTOR
OPTICAL PICK-UP
(KSS-213B)
FEI
2
FEO
1
RV102
FOCUS
GAIN
TEO
42
TEI
44
RV103
TRACKING
GAIN
LD
33
PHD
34
LD DRIVE
Q101, 102
PD
LD
LASER
DIODE
DIODE
31
RFO
30
RFI
RF
14
23
C.OUT
CNIN
55
24
SENS
SEIN
54
FE BIAS 37
RV101
FOCUS
BIAS
+5V
6
FE-O
7
FE-M
12
TA-M
13
TAO
21
DATA
20
XLT
19
CLK
4
FGD
25
FOK
FOCUS SW
Q103
DATAO
56
XLTO
57
CLKO
59
MDP
3
FOK
1
XLON
64
09
PCMD
LRCK
DATA
2
LRCK
1
21
20
BCLK
BCLK
3
22
LOUT 16
ROUT 13
•
SIGNAL PATH
:digital out (CD)
:CD
A
MAIN
SECTION
SECTION
(Page 37)
DIGITAL FILTER
D/A CONVERTER
IC104
X101
22.5792 MHz
22.5792 MHz
DATA
51
XLAT
52
CLOK
53
SCOR
43
SQSO
46
SQCK
47
SENS
49
XRST
50
D OUT
39
DATA
26
MLAT
28
CLOK
27
C
MAIN
SECTION
SECTION
(Page 37)
D OUT
CLK
49
DATA
50
XRST
60
SCOR
22
SENS
53
SQCK
48
SQSO
46
DF LATCH
52
XLAT
51
FOCUS SW
59
5
DRIVE
6
M
M904 (CD)
LOADING
MOTOR
MOTOR
DRIVER
DRIVER
IC801
2
10
DRIVE
LOAD-OUT
57
LOAD-IN
58
OUT-SW
56
IN-SW
55
S292
(LOAD IN)
S291
(LOAD OUT)
B
MAIN
SECTION
SECTION
(Page 38)
DIGITAL SIGNAL PROCESSOR
IC103
XTAI
34
CKO
4
XTI
•
XTO
5 • 6
SPOD
63
S101
(LIMIT)
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