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Extracted text from sony mdx 62 service manual (Ocr-read)
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TABLE OF CONTENTS
1. SERVICE NOTE
1-1. To Place the Set into Playback Mode ................................. 3
1-2. How to Check the Servo Board Waveformes ..................... 3
2. GENERAL
Installation .............................................................................. 4
Connections ............................................................................ 6
3. DISASSEMBLY
3-1. Panel (Rear) Assy ............................................................... 8
3-2. Case (Upper) ...................................................................... 8
3-3. Panel (Front) Assy .............................................................. 9
3-4. MD Block ........................................................................... 9
3-5. Main Board ...................................................................... 10
3-6. Chassis (OP) Block .......................................................... 10
3-7. Servo Board ...................................................................... 11
3-8. Optical Pick-up ................................................................ 11
3-9. Note on Assembly for the Chassis (OP) Block ................ 12
4. DIAGRAMS
4-1. IC Pin Descriptions .......................................................... 13
4-2. Circuit Boards Location ................................................... 16
4-3. Block Diagram ................................................................. 17
4-4. Printed Wiring Boards ÐServo SectionÐ ........................... 20
4-5. Schematic Diagram ÐServo SectionÐ ............................... 23
4-6. Schematic Diagram ÐMain SectionÐ ................................ 26
4-7. Printed Wiring Boards ÐMain SectionÐ ........................... 29
4-8. Printed Wiring Board ÐPower SectionÐ ........................... 31
4-9. Schematic Diagram ÐPower SectionÐ .............................. 33
5. EXPLODED VIEWS
5-1. Case Section ..................................................................... 40
5-2. Main Board Section ......................................................... 41
5-3. MD Section (1) ................................................................. 42
5-4. MD Section (2) ................................................................. 43
5-5. MD Section (3) ................................................................. 44
6. ELECTRICAL PARTS LIST ........................................ 45
SERVICE NOTE
CAUTION
Use of controls or adjustments or performance of proce-
dures other than those specified herein may result in haz-
ardous radiation exposure.
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.
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR
BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown 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 emission, observe
from more than 30 cm away from the objective lens.
NOTES ON PICK-UP FLEXIBLE BOARD
The pick-up flexible board in this set is secured to the optical pick-up
with an adhesive tape. Once the tape is removed, an adhering force
becomes weak, and it cannot be reused.
Therefore, if the optical pick-up is replaced, replace also the pick-up
flexible board with a new one.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE
WITH MARK ! 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 PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
Ë LA SƒCURITƒ!!
LES COMPOSANTS IDENTIFIƒS PAR UNE MARQUE ! SUR LES
DIAGRAMMES SCHƒMATIQUES ET LA LISTE DES PIéCES SONT
CRITIQUES POUR LA SƒCURITƒ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIéCES SONY
DONT LES NUMƒROS SONT DONNƒS DANS CE MANUEL OU
DANS LES SUPPLƒMENTS PUBLIƒS PAR SONY.
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SECTION 1
SERVICE NOTE
1-1. TO PLACE THE SET INTO PLAYBACK MODE
The this set has no key control function and cannot be placed into
the Playback mode alone.
For key control, the this set is controlled through serial
communication with a master unit (car audio player, TV tuner or
source selector compatible with the Sony BUS system.)
To service the this set, the set should be connected as given below:
MDX-62Master unit
(WX-C770, etc.)
BUS CONTROL IN BUS CONTROL OUT
1-2. HOW TO CHECK THE SERVO BOARD
WAVEFORMS
1. Remove the panel (rear) assy, case (upper) and panel (front) assy.
Then, remove the main board from the mechanism deck. (See
page 8 of ÒSECTION 3. DISASSEMBLYÓ.)
2. Remove the chassis (OP) block from the mechanism deck. (See
page 10 of ÒSECTION 3. DISASSEMBLYÓ.)
3. Short each bridge points BP1 and BP2 on the main board by
solder bridge.
BP1
BP2 Ð main board (conductor side) Ð
4. Connect the power board with the main board by the main
flexible board. Connect the main board with the servo board by
the servo flexible board.
5. Connect to a master unit. With the master unit OFF, press the
preset buttons 4 n 5 n 1 (2 seconds or more each) in this
turn to enter the TEST mode.
6. Open the doors and insert a disc in the chassis (OP) assy. Use
the SOURCE button on the master unit to select to MD to
playback.
7. Check the waveforms at each point on the servo board.
Note:After this check is completed, remove solder between
shorted bridge points BP1 and BP2 and open these points.