Page 1
Ð 2 Ð
TABLE OF CONTENTS
1. SERVICING NOTES
................................................ 3
2. GENERAL ................................................................... 5
3. DISASSEMBLY ......................................................... 8
4. SERVICE MODE ...................................................... 11
5. TEST MODE .............................................................. 12
6. ELECTRICAL ADJUSTMENTS ......................... 15
7. DIAGRAMS
7-1. IC Pin Function Description ........................................... 21
7-2. Block Diagram Ð CD Section Ð ..................................... 23
7-3. Block Diagram Ð Main Section Ð ................................... 27
7-4. Printed Wiring Boards Ð MAIN/JACK Boards Ð .......... 31
7-5. Schematic Diagram Ð MAIN/JACK Boards Ð .............. 35
7-6. Printed Wiring Boards Ð LCD/KEY Boards Ð .............. 40
7-7. Schematic Diagram Ð LCD/KEY Boards Ð ................... 45
8. EXPLODED VIEWS ................................................ 53
9. ELECTRICAL PARTS LIST ............................... 57Flexible Circuit Board Repairing
¥ Keep the temperature of the soldering iron around 270 ûC 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 chip component replacement
¥ Never reuse a disconnected chip component.
¥ Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
ATTENTION AU COMPOSANT AYANT RAPPORT
Ë LA SƒCURITƒ!
LES COMPOSANTS IDENTIFIƒS PAR UNE MARQUE 0
SUR LES DIAGRAMMES SCHƒMATIQUES ET LA LISTE
DES PIéCES SONT CRITIQUES POUR LA SƒCURITƒ
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIéCES SONY DONT LES
NUMƒROS SONT DONNƒS DANS CE MANUEL OU
DANS LES SUPPLƒMENTS PUBLIƒS PAR SONY. 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.
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.
HOW TO CHANGED THE CERAMIC FILTERS
This model is used two ceramic filters of CF1 and CF3.
You must use same type of color marked ceramic filters in order
to meet same specifications.
Therefore, the ceramic filter must be changed two pieces together
since itÕs supply two pieces in one package as a spare parts.
Page 2
Ð 3 Ð
SECTION 1
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static 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.
Before Replacing the Optical Pick-Up Block
Please be sure to check thoroughly the parameters as par the ÒOp-
tical Pick-Up Block Checking ProceduresÓ (Part No.: 9-960-027-
11) issued separately before replacing the optical pick-up block.
Note and specifications required to check are given below.
¥ FOK output: IC501 ts pin
¥ S curve P-to-P value: 1.2 Vp-p IC501 wa pin
When checking S curve P-to-P value, remove the lead wire to
disc motor.
¥ RF signal P-to-P value: 0.8 to 1.3 Vp-p
¥ Traverse signal P-to-P value: 0.7 to 1.8 Vp-p
¥ The repairing grating holder is impossible.Precautions for Checking Emission of Laser Diode
Laser light of the equipment is focused by the object lens in the
optical pick-up so that the light focuses on the reflection surface
of the disc. Therefore, be sure to keep your eyes more then 30 cm
apart from the object lens when you check the emission of laser
diode.
Laser Diode Checking Methods
During normal operation of the equipment, emission of the laser
diode is prohibited unless the upper panel is closed while turning
ON the S423. (push switch type)
However, in the service mode, the laser diode always emits light
even if S423 is not turned on.
The following two checking methods for the laser diode are oper-
able.
¥ Method-1 (In the service mode or normal operation):
Emission of the laser diode is visually checked.
1. Open the upper lid.
2. Push the S423 as shown in Fig. 1.
(Unnecessary in the service mode)
3. Press the
[CD ] key.
4. Check the object lens for confirming normal emission of the
laser diode. If not emitting, there is a trouble in the automatic
power control circuit or the optical pick-up.
During normal operation, the laser diode is turned ON about
2.5 seconds for focus searching.
Fig. 1 Method to push the S423
u
