Sony cdx 7520 service manual

Page 2

CDX-7520

TABLE OF CONTENTS

Section Title jag;
Specifications ~~~~~~~~~
Servicing Note --------- - 2
SECTION 1. GENERAL
Location of Controls ---------------------- 3
SECTION 2. CIRCUIT DESCRIPTION ---------- 4
SECTION 3. MECHANICAL ADJUSTMENTS 6
SECTION 4. ELECTRICAL ADJUSTMENTS ----- 6
SECTION 5. DIAGRAMS
5-1. Block Diagram --------------- ' 11
5-2. Semiconductor Lead Layouts .. 15
5-3. Printed Wiring Boards (MD Section) -~ 16
5-4. Schematic Diagram IMI) Section) ~~~~~ 19
5-5. Circuit Board Location ------------- 21
5-6. Printed Wiring Boards
IMAIN Section) """"""""""""""" 22
5-7. Schematic Diagam [MAIN Section) 25
5-8. Schematic Diagram (TUNER Section) -- 29
5-9. 16 Block Diagrams ~' 30
5-10. WAVEFORMS ------- - 33
SECTION 6. EXPLODED VIEWS ~- - 35
SECTION 7. ELECTRICAL PARTS LIST """" 41

SERVICING NOTE

Flexible Circuit Board Repairing

0 Keep the temperature of the soldering iron around
270°C during repairing.

Do not touch the soldering iron on the same con-
ductor of the circuit board (Within 3 times).

Be careful not to apply force on the conductor

when soldering or unsolderlng.

Notes on chip component replacement

0 Never reuse a disconnected chip component
0 Notice that the minus side of a tantalum capacitor
may be damaged by heat.

SAFETY~RELATED COMPONENT WARNINGI!

COMPONENTS IDENTIFIED BY MARK A OR DOTTED
LINE WITH MARK A 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 BV SONY.

Removing the Flat Package IC

1.

2.

Prepare an enameled wire (0.3mm diameter) and
apply it to the back side of the IC pins as illus-
trated below.

Solder or fix with adhesive tape.

Heat the IC pin with the soldering iron and draw
the enameled wire so that the IC pin is removed

from the pattern as illustrated.

ATTENTION AUCOMPO'SANT AYANT RAPPORT
A LA SECURITEI

LEs COMPOSANTS IDENTIFIES PAR UNE MARQUE A
sun LES DIAGRAMMES SCHEMATIOUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA sEcuané
DE FONCTIONNEMENT. NE REMPLACER czs com.
POSANTS QUE PAR DES PIECES SONY DONT LEs
NUMénos som DONNEs DANS cE MANUEL ou
DANS LEs SUPPLEMENTS PUBLIES FAR SONY.