Page 1
Ñ 2 Ñ
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 COMPO-
NENTS WITH SONY PARTS WHOSE PART NUM-
BERS APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY.This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER
PRODUCT MARKING is
located on the rear exterior.
CAUTIONUse of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
This caution
label is located
inside the unit.
TABLE OF CONTENTS
1. SERVICING NOTE
........................................................... 3
2. GENERAL ........................................................................... 4
3. DISASSEMBLY
3-1. Top Plate Assembly ............................................................. 8
3-2. Front Panel Assembly .......................................................... 8
3-3. Base Unit ............................................................................. 9
3-4. Back Panel ........................................................................... 9
4. ELECTRICAL BLOCK ADJUSTMENTS............... 10
5. DIAGRAMS
5-1. Circuit Boards Location .................................................... 12
5-2. IC Pin Function
¥ IC101 Focus/Tracking/Sled/EFM Comparator
(CXD2515AQ ) ............................................................... 13
¥ IC201 System Control (CXP84124-043Q) ..................... 16
5-3. Printed Wiring Board Ñ Servo, Panel Section Ñ ............. 20
5-4. Schematic Diagram Ñ Servo, Panel Section Ñ ............... 23
5-5. Schematic Diagram Ñ Audio, Power Section Ñ ............. 28
5-6. Printed Wiring Board Ñ Audio, Power Section Ñ ........... 31
6. EXPLODED VIEWS
6-1. Top Plate Assembly Seciton .............................................. 37
6-2. Front Panel Section ........................................................... 38
6-3. Back Panel Section ............................................................ 39
6-4. Base Unit Section (BU-12A) ............................................. 40
7. ELECTRICAL PARTS LIST..................................... 41
The laser component in this product
is capable of emitting radiation
exceeding the limit for Class 1.
Notes on chip component replacement
¥ Never reuse a disconnected chip component.
¥ Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
¥ Keep the temperature of soldering iron around 270ûC
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.
ADVARSEL :
USYNLIG LASERSTRÅLING VED ÅBNING NÅR
SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION. UNDGÅ UDSAETTELSE
FOR STRÅLING.
CAUTION :
INVISIBLE LASER RADIATION WHEN OPEN AND
INTERLOCKS DEFEATED. AVOID EXPOSURE TO BEAM.
VARO! :
AVAT TAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALT-
TIINA NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE. ÄLÄ KATSO SÄTEESEEN.
VARNING :
OSYNLIG LASERSTRÅLING NÄR DENNA DEL ÄR ÖPP-
NAD OCH SPÄRREN ÄR URKOPPLAD. BETRAKTA EJ STRÅLEN.
VORSICHT : UNSICHTBARE LASERSTRAHLUNG, WENN
ABDECKUNG GEÖFFNET UND SICHEREITSVERRIEGELUNG ÜBERBRÜCKT. NICHT DEM STRAHL AUSSETZEN.
ADVARSEL :
USYNLIG LASERSTRÅLING NÅR DEKSEL ÅPNES OG
SIKKERHEDSLÅS BRYTES. UNNGÅ EKSPONERING FOR STRÅLEN.
Page 2
Ñ 3 Ñ
SECTION 1
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
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 emission, observe
from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION CHECK
Carry out the ÒS curve checkÓ in ÒCD section adjustmentÓ and check
that the S curve waveform is output three times.
WRITING OF FOCUS/TRACKING AUTO GAIN DATA
General CD palyers using digital servo ICs automatically adjust the
focus/tracking gain each time the disc is changed.
In this unit, the gain of the standard disc (YEDS-18) is written in the
non-volatile memory (IC203:X24C01S) of the servo board so that
the gain need not be re-adjusted when changing discs.
Therefore, if the servo board, IC203 of the servo board, or optical
pick-up has been replaced, be sure to write the auto gain data.
1. Connect TP (ADJ: Pin 3 of CN515) to GND (Ground), and turn
ON the POWER switch.
2. Insert the test disc (YEDS-18). (The TOC data of the disc will be
read.)
This memorizes the auto gain data of the test disc.
Note:
¥ If the disc is replaced without turning OFF the power, the auto gain
data of the last disc inserted will be memorized.
¥ If the POWER switch is turned ON without connecting TP (ADJ)
to GND, the auto gain data will not be memorized when the disc is
inserted, and the data memorized the last time will be taken as the
focus/tracking data.FLUORESCENT INDICATOR TUBE FULL LIGHTING MODE
1. Connect TP (AFJ:Pin 2 of CN515) to GND (Ground), and turn
ON the POWER switch.
2. The bridge check (check for short-circut between pins of the S
RAM (IC202 of the servo board)) is performed, and all the FL
tubes light up if there is no bridge.
3. When a key other than the p(stop) key is pressed, the correspond-
ing FL tubes lights up.
Each time the p(stop) key is pressed, all the FL tubes light up.
[SERVO BOARD] Ñ Conductor Side Ñ
CN514
CN513CN515
IC104 IC105IC102
IC202ADJ321
AFJ
