Sony HCD-VM330AV Service Manual ▷ View online
17
HCD-VM330AV
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 neutral detergent
when the signal level is low than specified value with the
following checks.
following checks.
S-Curve Check
Procedure :
1. Connect an oscilloscope to TP (FEO) and TP (DVC).
2. Connect between TP (FEI) and TP (VC) by lead wire.
3. Turn Power switch on.
4. Load the disc (YEDS-18) and actuate the focus search. (In
1. Connect an oscilloscope to TP (FEO) and TP (DVC).
2. Connect between TP (FEI) and TP (VC) by lead wire.
3. Turn Power switch on.
4. Load the disc (YEDS-18) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)
search)
5. Confirm that the oscilloscope waveform (S-curve) is
symmetrical between A and B. And confirm peak to peak level
within 4
within 4
±
1 Vp-p.
7. 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
brightness to obtain best waveform.
RF Level Check
Procedure :
1. Connect an oscilloscope to TP (RFAC) and TP (DVC).
2. Turn Power switch on.
3. Load the disc (YEDS-18) and playback.
4. Confirm that the oscilloscope waveform is clear and check RF
1. Connect an oscilloscope to TP (RFAC) and TP (DVC).
2. Turn Power switch on.
3. Load the disc (YEDS-18) and playback.
4. Confirm that the oscilloscope waveform is clear and check RF
signal level is correct or not.
5. Measure the RFDC in the same way.
BD board
Oscilloscope
TP(FEO)
TP(DVC)
TP(DVC)
symmetry
S-curve waveform
within 4
±
1Vp-p
A
B
TP (RFAC) or TP(RFDC)
TP(DVC)
TP(DVC)
BD board
oscilloscope
Note:
Clear RF signal waveform means that the shape “
◊
” can be
clearly distinguished at the center of the waveform.
RF signal waveform
E-F Balance (1 Track jump) Check
Procedure:
1.
1.
Connect an oscilloscope to TP (TEO) and TP (DVC).
2.
Turn Power switch on.
3.
Load the disc (YEDS-18) and playback the number five track.
4.
Press the X button. (Becomes the 1track jump mode.)
5.
Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
waveform.
1 track jump waveform
Specification level:
x
100=less than
±
22%
6.
After check, remove the lead wire connected in step 1.
RF PLL Free-run Frequency Check
Procedure :
1.
1.
Connect a frequency counter to TP (XPCK) and GND.
2.
Turn Power switch on.
3.
Load the disc (YEDS-18) and playback the number five track.
4.
Confirm that the reading on frequency counter is 4.3218MHz.
oscilloscope
BD board
TP (TEO)
TP (DVC)
TP (DVC)
+
–
–
A
B
+
–
–
frequency counter
BD board
TP (XPCK)
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
level : 1.1
±
0.3Vp-p
0V
Center of
waveform
waveform
B
Symmetry
A (DC voltage)
level=1.3
±
0.6Vp-p
18
HCD-VM330AV
Checking Location :
[ BD BOARD ] — SIDE B —
TP (DVC)
TP (FEO)
TP (XPCK)
TP (TEO)
TP (RFDC)
TP (VC)
TP
(RFAC)
IC103
IC101
TP (FEI)
R120
VIDEO SECTION
Video Frequency Adjustment
Connection:
Procedure:
1. Connect a frequency counter to TP (27MHz) and TP (GND).
2. Turn power switch on.
3. Turn the
1. Connect a frequency counter to TP (27MHz) and TP (GND).
2. Turn power switch on.
3. Turn the
[FUNCTION]
knob of amplifier unit (TA-SV7AV) to
set the CD function.
4. Adjust CT503 on the VMP board so that the frequency counter
reading 27.0 MHz
±
80 Hz at stop status.
Adjustment Location:
[VMP BOARD] (SIDE A)
J301
CN501
CN502
IC507
TP (GND)
TP (27MHz)
CT503
Video
Frequency
Adjustment
Video
Frequency
Adjustment
VMP board
TP (27MHz)
TP (GND)
TP (GND)
frequency counter
19
HCD-VM330AV
SENSOR SECTION
Disc Sensor Level Adjustment
Procedure:
1.
1.
Connect an oscilloscope to TP (DISC SENSOR) and TP (GND)
on the MAIN board.
on the MAIN board.
2.
Turn the power on.
3.
In the no disc status, adjust RV301 on the MAIN board so that
the waveform of oscilloscope becomes as below. And check
the peak to peak level is more than 4 Vp-p.
the waveform of oscilloscope becomes as below. And check
the peak to peak level is more than 4 Vp-p.
4.
Insert a disc into the disc slot No. 58.
5.
Check that the waveform of oscilloscope as below. And adjust
RV301 on the MAIN board so that the peak to peak level
becomes less than 0.5 Vp-p besides becomes as little as possible.
RV301 on the MAIN board so that the peak to peak level
becomes less than 0.5 Vp-p besides becomes as little as possible.
6.
Check that the waveform and peak to peak level satisfy
specification of step 4. If it is wrong, repeat from step 4 until
satisfy.
specification of step 4. If it is wrong, repeat from step 4 until
satisfy.
Adjustment Location:
Waveform when no disc
,
turn the RV301
NG
OK
more than 4 Vp-p
Waveform when disc in
less than 0.5 Vp-p
[MAIN BOARD] (CONDUCTOR SIDE)
RV301
Disc Sensor Level
Adjustment
TP (GND)
TP (DISC SENSOR)
HCD-VM330AV
21
21
VIDEO CD CONTROLLER
IC502 (1/2)
A/D
CONVERTER
VO1+
VO1–
27
24
26
32
31
35
34
1
2
5
10
A
CD +3.3V
OPTICAL
TRANSCEIVER
IC361
OSC
BUFFER
IC106
OPTICAL
OUT (CD)
RFAC
ASYO
ASYI
FILTER
FILO
PCO
CLTV
FILI
DIGITAL PLL
ASYMMETRY
CORRECTOR
EFM
DEMODULATOR
DIGITAL SIGNAL PROCESSOR
IC101 (1/2)
MDP
DIGITAL
CLV
PROCESSOR
32K
RAM
ERROR
CORRECTOR
INTERNAL BUS
SQCK
SQSO
MUTING
EXCK
PCMD
DATA
BCK
LRCK
C2PO
C4M
XTSL
XTAO
XTAI
BCK
LRCK
WDCK
C2PO
MD2
DOUT
DIGITAL
OUT
D/A
DIGITAL
INTERFACE
CLOCK
GENERATOR
SUBCODE
PROCESSOR
SCOR
WFCK
XUGF
GFS
EMPH
SENS
DATA
CLOK
XLAT
SBSO
SENSE CLK
SENSE
DSP CLK
DSP DATA
DSP LATCH
SE
TE
FE
RFDC
FOCUS/
TRACKING/SLED
SERVO DSP
FOCUS/TRACKING/SLED
PWM GENERATOR
SFDR
IN3+
IN4R
IN3–
VO3+
VO3–
IN2+
IN2–
IN1+
IN1–
8
STBY
SRDR
TFDR
TRDR
FFDR
FRDR
SSTP
COUT
MIRR,
DFCT, FOK
DETECTOR
SERVO AUTO
SEQUENCER
SERVO
INTERFACE
CPU INTERFACE
SCLK
TO CPU INTERFACE
FOK
MIRR
DFCT
VO4+
VO4–
M101
(SPINDLE)
MOTOR
DRIVE
XRST
DSP MUTING
MOTOR
DRIVE
COIL
DRIVE
VO2+
VO2–
COIL
DRIVE
M
M
M102
(SLED)
FOCUS/TRACKING COIL DRIVE,
SPINDLE/SLED MOTOR DRIVE
IC102
2-AXIS
DEVICE
(TRACKING)
(FOCUS)
DIGITAL SERVO
PROCESSOR
IC101 (2/2)
(Page 22)
•
SIGNAL PATH
: CD PLAY (ANALOG OUT)
: CD PLAY (DIGITAL OUT)
55
56
52
47
CTRL1
SUBQ DATA
SUBQ CLK
SCOR
MCLK
33.8MHz
B
(Page 22)
DATA, BCK,
LRCK, C2PO
DEVICE RESET
33
31
32
29
30
34
19
8
40 41 39 43
22
20
21
26
TO SERVO AUTO
SEQUENCER
50
53 55
XPCK
12
52 54
49
48
25
76 77
66
71
16
69
72
67
65
17
64
63
2
14
79 80
15
7
4 6 5
10 11 13 68
3
95 5 97
1
18
84 83
10
2
77
11
6
7
8
9
16
18
11
10
12
2
1
E
B
A
CD +5V
F
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
OPTICAL PICK-UP
BLOCK
(A-MAX. 3)
SW
PD
I-V AMP
EQ
IN
15
3
4
EQ
AC
SUM
17
FEI
RF DC
AMP
28
RFDCO
29
RFDCI
RFAC
VCA
LD ON
82
PWM1
28
PWM2
26
PWM3
24
LIMIT
SWITCH
XRESET
12
91
18
93
T-SENS3
T-SENS2
T-SENS1
TABLE
SENSOR
IC11 – 13
LOAD IN SW 6
LOAD OUT SW 7
LOAD IN
LOAD OUT
S842
(LOAD)
D-SENS 92
DISC IN
DETECT SENSOR
D841, Q841
LOAD NEG 3
LOAD POS 2
LOADING
MOTOR CONTROL
Q881 – 884
TABLE POS 5
TABLE NEG
TABLE
MOTOR CONTROL
Q885 – 888
100
3
2
RN1
FN1
16
17
MOTOR
DRIVE
9
8
10
11
MOTOR
DRIVE
OUT1 –
OUT1 +
OUT2 –
OUT2 +
RIN2
FIN2
LOADING/TABLE
MOTOR DRIVE
IC881
M51
(LOADING)
M
M
M52
(TABLE)
SYSTEM CONTROLLER
IC801 (1/5)
83
C-XRST
SECTION 7
DIAGRAMS
7-1.
BLOCK DIAGRAM – CD SERVO Section –
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