Sony CDX-51 - Notes on Handling the Optical Pick-Up Block or Base Unit; Servicing Note

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.
Laser Diode Properties
@ = Material: GaAlAs
© Wavelength: 780 nm
@ Emission Duration: continuous
@ Laser Output Power: less than 44.6 4 W*
* This output is the value measured at a distance of
200 mm from the objective lens surfase on the
Optical Pick-up Block.
CAUTION
Use of controls or adjustments or performance
of procedures other than those specified herein
may result in hazardous radistion exposure.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK f\ 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 PUB-
LISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!
LES COMPOSANTS IDENTIFIES PAR UNE MARQUE {\
SUR LES DIAGRAMMES SCHEMATIQUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIECES SONY DONT LES
NUMEROS SONT DONNES DANS CE MANUEL OU
DANS LES SUPPLEMENTS PUBLIES PAR SONY.
TABLE OF CONTENTS
Section Title Page
1 Specifications
Notes on Handling the Optical Pick-up Block
or Base Unit 2
Servicing Note <++++++eeeeecteeeeeee eter eee eees 2
1. GENERAL
Installation 3
Connections s
Location and Function of Controls -++++++++++ 6
2 DISASSEMBLY «-.-.----------e cece eee ee 7
3. MECHANICAL ADJUSTMENTS
3-1. Elevator Height Adjustment ++ ++++++++++++* 10
4. ELECTRICAL ADJUSTMENTS
4-1. Focus Offset Adjustment --
4-2. Tracking Offset Adjustment -
4-3. DC Balance Adjustment
5. DIAGRAMS
5-1. Compact Disc Changer Section
Block Diagram
5-2. Hideaway Section Block Diagram
5-3. Compact Disc Changer Section
Printed Wiring Boards «+++ ++++++eeeeeeeees 20
5-4. Compact Disc Changer Section
Schematic Diagram
5-5. Hideaway Section Printed Wiring Board -
5-6. Hideaway Section Schematic Diagram
5-7. IC Pin Function Description
6. EXPLODED VIEWS «--------).--s-0e0 38
7. ELECTRICAL PARTS LIST ------------ 45
SUPPLEMENT-1
SERVICING NOTE
Flexible Circuit Board Repairing
Keep the temperature of the soldering iron around
270°C during 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 chip component replacement
aay as
Never reuse a disconnected chip component.
Notice that the minus side of a tantalum capacitor may
be damaged by heat.