Sony MCE-SV7 / MHC-SV7AV Service Manual ▷ View online
MCE-SV7
9
3-6.
PANEL BOARD, SUB PANEL BOARD
3-7.
LID (CD)
5
two claws
4
four screws
(BVTP2.6
(BVTP2.6
×
8)
6
SUB PANEL board
1
five screws
(BVTP2.6
(BVTP2.6
×
8)
3
PANEL board
2
two claws
3
lid (CD)
4
spring (CD)
1
screw
(BVTP2.6
(BVTP2.6
×
8)
2
bracket (LID) assy
10
MCE-SV7
SECTION 4
TEST MODE
Note:
Use following buttons in the test mode.
no mark : Button of video CD unit (MCE-SV7)
*1
: Button of amplifier unit (TA-SV7AV)
*2
: Button of tuner unit (ST-SV7)
[CD Delivery Mode]
• This mode moves the optical pick-up to the position durable to
vibration. Use this mode when returning the set to the customer
after repair.
after repair.
Procedure:
1. Press the
1. Press the
I
/
1
*
1
button to turn the power on.
2. Turn the
[FILE SELECT]
*
1
knob to set the CD function.
3. While pressing the
[EQ ON/OFF]
*
1
button, press the
I
/
1
*
1
button.
4. The message “LOCK” is displayed on the fluorescent indica-
tor tube of tuner unit and turn the power off automatically, and
the CD delivery mode is set.
the CD delivery mode is set.
[GC Test Mode]
Enter the GC Test Mode
Enter the GC Test Mode
Procedure 1:
1. Press the
1. Press the
I
/
1
*
1
button to turn the power on.
2. While pressing the both
[PLAY MODE]
and
[ ]
buttons, press
the
[ ]
(DISC 1) button.
3. LEDs and fluorescent indicator tube are all turned on of all
units.
Procedure 2:
1. Press the
1. Press the
I
/
1
*
1
button to turn the power on.
2. While pressing the both
[STEREO/MONO]
*
2
and
[CINEMA STUDIO C]
*
1
buttons, press the
[CLOCK/TIMER]
*
2
button.
3. LEDs and fluorescent indicator tube are all turned on of all
units.
Version Display Mode
Procedure:
1. Enter the GC test mode.
2. Each time the
1. Enter the GC test mode.
2. Each time the
[DISC 1]
or
[TUNER MEMORY]
*
2
button is
pressed, microcomputer or mechanism deck version is dis-
played of each unit.
played of each unit.
3. Press the
[DISC 3]
or
[TUNING +]
*
2
button to detail is dis-
played the version.
Key Check Mode
Procedure:
1. Enter the GC test mode.
2. Press the
1. Enter the GC test mode.
2. Press the
[DISC 2]
or
[TUNING --]
*
2
button to set the key
check mode, and displays “K 0 J 0 V 0” on the fluorescent
indicator tube of tuner unit.
indicator tube of tuner unit.
3. All buttons are pressed of video CD unit, all LEDs are blink-
ing of video CD unit. (not change the display of fluorescent
indicator tube)
indicator tube)
Releasing the GC Test Mode
To release from this mode, press three buttons in the same manner
as entering this mode or disconnect the power cord.
as entering this mode or disconnect the power cord.
x
Z
[CD Service Mode]
• This mode can run the CD sled motor optionally. Use this mode,
for instance, when cleaning the optical pick-up.
Procedure:
1. Press the
1. Press the
I
/
1
*
1
button to turn the power on.
2. Turn the
[FILE SELECT]
*
1
knob to set the CD function.
3. While pressing the both
[PLAY MODE]
and
[ ]
buttons, press
the
[ ]
button.
4. Set to the CD service mode.
5. With the CD in stop status, press the
5. With the CD in stop status, press the
[ ]
button to move the
optical pick-up to outside track, or press the
[ ]
button to
inside track.
6. To release from this mode, perform as follows.
1) Move the optical pick-up to the most inside track.
2) Disconnect the power cord.
2) Disconnect the power cord.
Notes:
• Always move the optical pick-up to most inside track when
releasing from this mode. Otherwise, a disc will not be un-
loaded.
loaded.
• Do not run the sled motor excessively, otherwise the gear can
be chipped.
[CD Cancellation Mode of Repeat Limitation]
• This mode can cancel the CD repeat limitation (5 times).
Procedure:
1. Press the
Procedure:
1. Press the
I
/
1
*
1
button to turn the power on.
2. Turn the
[FILE SELECT]
*
1
knob to set the CD function.
3. While pressing the both
[PLAY MODE]
and
[ ]
buttons, press
the
[REPEAT]
button.
4. CD repeat limitation is canceled.
5. To release this mode, disconnect the power cord.
5. To release this mode, disconnect the power cord.
x
.
M
m
x
MCE-SV7
11
11
SECTION 5
ELECTRICAL ADJUSTMENTS
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
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
MCE-SV7
12
12
SECTION 6
DIAGRAMS
6-1.
BLOCK DIAGRAM – CD SERVO Section –
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
IC102
OSC
BUFFER
IC106
OPTICAL OUT
TO ST-SV7
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 13)
•
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 13)
DATA, BCK,
LRCK, C2PO
C
(Page 14)
M-RESET
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
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