Table Of Contents; Servicing Notes - Sony Discman D-180AN Service Manual

TABLE OF CONTENTS

Specifications ........................................................................... 1
1. SERVICING NOTES
2. GENERAL
....................................................................... 4
3. DISASSEMBLY
3-1. Lid Assy, Upper Removal ........................................... 5
3-2. Cabinet (Front) Assy, MD Assy Removal .................. 5
3-3. Main Board Removal ................................................. 6
4. SERVICE MODE ..................................................... 7
5. ADJUSTMENTS
........................................................... 8
6. DIAGRAMS
6-1. Explanation of IC Terminals ...................................... 11
6-2. Block Diagram .......................................................... 13
6-3. Printed Wiring Boards .............................................. 16
6-4. Schematic Diagram ................................................... 19
7. EXPLODED VIEWS
7-1. Cabinet Section ......................................................... 28
7-2. Optical Pick-up Section ............................................ 29
8. ELECTRICAL PARTS LIST
DANGER
Invisible laser radiation when open and interlock failed or defeated.
Avoid direct exposure to beam.
CAUTION
Use of controls or adjustments or performance of procedures other than
those specified herein may result in hazardous radiation exposure.
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
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be damaged
by heat.
.................................................... 2
.................................... 30
This Compact Disc player is
classified as a CLASS 1 LASER
product.
The CLASS 1 LASER
PRODUCT label is located on the
bottom exterior.
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
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE ! SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE 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.

SERVICING NOTES

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 30cm away from the objective lens.
Before Replacing the Optical pick-up Block
Please be sure to check thoroughly the parameters as per the "Optical
pick-up Block Checking Procedure" (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 !™ pin
When checking FOK, remove the lead wire to disc motor.
• S curve P-to-P value : 1.2±0.3Vp-p IC501 #¡ pin. (Connect pin !™ of
IC501 (TP880) and 3 of IC501 (GND) with a jumper wire).
When checking S curve P-to-P value, remove the lead wire to disc
motor.
• Adjusted part for focus gain adjustment : RV503
• RF signal P-to-P value : 0.8 - 1.2Vp-p
• Traverse signal P-to-P value : 1.0 - 2.4Vp-p
• The repairing grating holder is impossible.
• Adjusted part for tracking gain adjustment : RV502
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À LA SÉCURITÉ!
SECTION 1