MCE-SV7, MHC-SV7AV - Sony Audio Service Manual (repair manual)

Model
MCE-SV7 MHC-SV7AV
Pages
52
Size
6.4 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
mce-sv7-mhc-sv7av.pdf
Date

View Sony MCE-SV7 / MHC-SV7AV Service Manual online

SERVICE MANUAL
VIDEO CD/CD PLAYER
E Model
SPECIFICATIONS
MCE-SV7
Ver 1.3  2002.12
MCE-SV7 is the Video CD/CD player
section in MHC-SV7AV.
Model Name Using Similar Mechanism
NEW
CD Mechanism Type
CDM63B
Base Unit Name
BU-30BD61A
Optical Pick-up Name
OP Assy (A-MAX.3)
9-873-155-04
Sony Corporation
2002L0500-1
Home Audio Company
C
 2002.12
Published by Sony Engineering Corporation
VIDEO CD/CD player section
System
Compact disc and digital
audio system
Laser
Semiconductor laser
(
λ
=795 nm)
Emission duration:
continuous
Frequency response
2 Hz – 20 kHz (
±
0.5 dB)
Signal-to-noise ratio
More than 90 dB
Dynamic range
More than 90 dB
Video color system format
NTSC, PAL
OPTICAL OUT
(Square optical connector jack, rear panel)
Design and specifications are subject to change
without notice.
General
Dimensions (w/h/d)
Approx. 280 x 108 x 330 mm
Mass
Approx. 2.8 kg
2
MCE-SV7
SAFETY-RELATED  COMPONENT  WARNING!!
COMPONENTS  IDENTIFIED  BY  MARK  
0
  OR  DOTTED
LINE  WITH  MARK  
0
  ON  THE  SCHEMATIC  DIAGRAMS
AND  IN  THE  PARTS  LIST  ARE  CRITICAL  TO  SAFE
OPERATION.  REPLACE  THESE  COMPONENTS  WITH
SONY  PARTS  WHOSE  PART  NUMBERS  APPEAR  AS
SHOWN  IN  THIS  MANUAL  OR  IN  SUPPLEMENTS  PUB-
LISHED  BY  SONY.
The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES  ON  LASER  DIODE  EMISSION  CHECK
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.
LASER  DIODE  AND  FOCUS  SEARCH  OPERATION
CHECK
Carry out the “S curve check” in “CD section adjustment” and
check that the S curve waveforms is output three times.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C dur-
ing repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board. (within 3 times)
• Be careful not to apply force on the conductor when soldering
or unsoldering.
NOTES  ON  HANDLING  THE  OPTICAL  PICK-UP
BLOCK  OR  BASE  UNIT
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
This appliance is classified as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on
the rear exterior.
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
The following caution label is located inside the unit.
3
MCE-SV7
TABLE  OF  CONTENTS
1.
SERVICING  NOTES
...............................................
4
2.
GENERAL
...................................................................
5
3.
DISASSEMBLY
3-1. Disassembly Flow ...........................................................
6
3-2. Cover ...............................................................................
7
3-3. CD Mechanism Deck (CDM63B) ..................................
7
3-4. MAIN Board ...................................................................
8
3-5. Front Panel Section .........................................................
8
3-6. PANEL Board, SUB PANEL Board ...............................
9
3-7. Lid (CD) ..........................................................................
9
4.
TEST  MODE
.............................................................. 10
5.
ELECTRICAL  ADJUSTMENTS
CD Section ...................................................................... 11
VIDEO Section ............................................................... 11
6.
DIAGRAMS
6-1. Block Diagram  – CD SERVO Section – ....................... 12
6-2. Block Diagram  – AUDIO/VIDEO Section – ................ 13
6-3. Block Diagram  – MAIN Section – ................................ 14
6-4. Note For Printed Wiring Boards
and Schematic Diagrams ................................................ 15
6-5. Printed Wiring Board  – BD Section – ........................... 16
6-6. Schematic Diagram  – BD Section – .............................. 17
6-7. Printed Wiring Boards
– CD CHANGER Section – ............................................ 18
6-8. Schematic Diagram  – CD CHANGER Section – ......... 19
6-9. Printed Wiring Boards  – AUDIO/VIDEO Section – ..... 20
6-10. Schematic Diagram
– AUDIO/VIDEO Section (1/3) – .................................. 21
6-11. Schematic Diagram
– AUDIO/VIDEO Section (2/3) – .................................. 22
6-12. Schematic Diagram
– AUDIO/VIDEO Section (3/3) – .................................. 23
6-13. Printed Wiring Boards  – MAIN Section – .................... 24
6-14. Schematic Diagram  – MAIN Section – ......................... 25
6-15. Printed Wiring Boards  – PANEL Section – .................. 26
6-16. Schematic Diagram  – PANEL Section – ....................... 27
6-17. IC Pin Function Description ........................................... 32
7.
EXPLODED  VIEWS
7-1. Cover, Front Panel Section ............................................. 41
7-2. Chassis Section ............................................................... 42
7-3. CD Mechanism Deck Section-1 (CDM63B) .................. 43
7-4. CD Mechanism Deck Section-2 (CDM63B) .................. 44
7-5. Base Unit Section (BU-30BD61A) ................................ 45
8.
ELECTRICAL  PARTS  LIST
............................... 46
4
MCE-SV7
SECTION  1
SERVICING  NOTES
This set is a component of the MHC-SV7AV.
The MHC-SV7AV system configuration is as shown below, and
therefore it does not operate normally unless all four components
are connected.
In performing the repair, connect all components with the system
cables.
Note: The precaution to the users is described on the label stuck
on the back panel (Video CD player) and in the troubleshooting
section in the Operation Manual.
System Configuration:
POWER SUPPLY
AC IN
TA
HTC & VMP 
µ
con
MASTER & GRAPHIC 
µ
con
ST
MCE
TC 
µ
con
TC
DISPLAY
CD-TEXT TEST  DISC
This unit is able to display the test data (character information)
written in the CD on its fluorescent indicator tube.
The CD-TEXT TEST DISC (TGCS-313:4-989-366-01) is used
for checking the display.
To check, perform the following procedure.
Checking Method:
1. Press the
I
/1
button to turn the power on, set the disc to the
disc table with the “test disc” label facing up, and chuck the
disc.
2. Press the 
[CD]
 button to set CD function, and press the
N
button to playback the disc.
3. The following will be displayed on the liquid crystal display.
Display : 1KHZ/0DB/L R
4. Pressing the 
[--        ]
 or 
[        +]
 button, select the track. The text
data of each track will be displayed.
For details of the displayed contents for each track, refer to “Table
1 : CD-TEXT TEST DISC TEXT Data Contents”.
Restrictions in CD-TEXT Display
In this unit, some special characters will not be displayed prop-
erly. These will be displayed as a space or a character resembling
it.
Table 1 : CD-TEXT TEST DISC TEXT Data Contents
(TRACKS No. 1 to 20:Normal Characters)
1
1kHz/0dB/L&R
2
20Hz/0dB/L&R
3
40Hz/0dB/L&R
4
100Hz/0dB/L&R
5
200Hz/0dB/L&R
6
500Hz/0dB/L&R
7
1kHz/0dB/L&R
8
5kHz/0dB/L&R
9
7kHz/0dB/L&R
10
10kHz/0dB/L&R
11
16kHz/0dB/L&R
12
18kHz/0dB/L&R
13
20kHz/0dB/L&R
14
1kHz/0dB/L&R
15
1kHz/–1dB/L&R
16
1kHz/–3dB/L&R
17
1kHz/–6dB/L&R
18
1kHz/–10dB/L&R
19
1kHz/–20dB/L&R
20
1kHz/–60dB/L&R
TRACK
No.
Displayed Contents
Note:
 Track No. 21 to 99 are not displayed.
.
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