Sony CDX-2250 - Cd Changer User manual

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Model Name Using Similar Mechanism CDX-2180
CD Drive MechanismType MG-363X-121
Optical Pick-up Name KSS-521A
SERVICE MANUAL
US Model
Canadian Model
CDX-2250
E Model
CDX-3500
CDX-2250/3500
FM/AM COMPACT DISC PLAYER
MICROFILM
SPECIFICATIONS
Photo: CDX-2250

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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 HANDLINGTHEOPTICAL 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
À LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE !SUR LES
DIAGRAMMES SCHÉMATIQUES ETLALISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

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TABLE OF CONTENTS
1. GENERAL
Location of Controls.................................................................. 4
Getting Started........................................................................... 4
CD Player .................................................................................. 5
Radio ......................................................................................... 5
Other Functions ......................................................................... 6
Additional Information .............................................................. 6
Connections ............................................................................... 8
2. DISASSEMBLY
2-1. Cover ASSY ........................................................................ 10
2-2. Front Panel ASSY ............................................................... 10
2-3. Display Board ..................................................................... 11
2-4. CD Mechanism Block ......................................................... 11
2-5. Main Board ......................................................................... 12
2-6. Heat Sink ............................................................................. 12
2-7. Chassis (T) Sub ASSY ........................................................ 13
2-8. Lever ASSY......................................................................... 13
2-9. Servo Board......................................................................... 14
2-10. Roller ASSY........................................................................ 14
2-11. Chassis (OP) (O/S) ASSY ................................................... 15
2-12. Optical Pick-up Block ......................................................... 15
3. ELECTRICAL ADJUSTMENTS
Tuner Section........................................................................... 16
CD Section .............................................................................. 18
4. DIAGRAMS
4-1. IC Pin Description............................................................... 19
4-2. Circuit Boards Location ...................................................... 21
4-3. Printed Wiring Boards –CD Mechanism Section–.............. 23
4-4. Schematic Diagram –CD Mechanism Section– .................. 25
4-5. Printed Wiring Board –Display Section– ............................ 27
4-6. Schematic Diagram –Display Section–............................... 29
4-7. Printed Wiring Board –Main Section– ................................ 31
4-8. Schematic Diagram –Main Section (1/2)– .......................... 33
4-9. Schematic Diagram –Main Section (2/2)– .......................... 35
5. EXPLODEDVIEWS
5-1. Chassis Section ................................................................... 39
5-2. Front Panel Section ............................................................. 40
5-3. CD Mechanism Section (1) ................................................. 41
5-4. CD Mechanism Section (2) ................................................. 42
5-5. CD Mechanism Section (3) ................................................. 43
6. ELECTRICAL PARTS LIST........................................... 44

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SECTION 1
GENERAL This section extracted from US,
Canadian model’s instruction manual.

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SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-1. COVER ASSY
2-2. FRONT PANEL ASSY
4 cover assy
1 claw
2 claw
3 claws
5 front panel assy
1 claws
2 claws
3 claw
4 connector