2
TABLE OF CONTENTS
1. GENERAL
Connections ............................................................................. 3
2. DISASSEMBLY
2-1. Bottom Plate........................................................................ 5
2-2. Main Board Section ............................................................ 6
2-3. Main Board ......................................................................... 6
3. DIAGRAMS
3-1. Printed Wiring Board .......................................................... 7
3-2. Schematic Diagram ............................................................. 8
3-3. IC Block Diagram ............................................................... 9
4. EXPLODED VIEWS
4-1. Heat Sink (Main) Section.................................................. 10
4-2. Main Board Section .......................................................... 11
5. ELECTRICAL PARTS LIST ........................................ 12
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.
XM-502Z
PROTECTOR OPERATION CHECK
Thermal Protect
1. Short across TH901 with the power on.
2. Verify that the protector is operated and LED901 illuminates
red.
3. Verifythat the protectoris released andLED901illuminatesgreen
when the short is removed.
4. Likewise, perform items 1 to 3 for TH902 and TH903.
Over Current Protect
1. Short between the positive and negative sides of the speaker
output terminal CN903 (2/2) with the power on.
(Perform this shorting for each channel on L and R.)
2. Verify that the protector is operated and LED901 illuminates
red.
3. Verify that the protector is not released and LED901 remains
red even when the short is removed.
4. Verifythat the protectoris released andLED901illuminatesgreen
when the power is turned off and then on again.
Offset Protect
1. Short between the +12V terminal of CN903 (1/2) and the BTL+
or BTL– of the speaker output terminal CN903 (2/2).
(Short between +12V terminal and BTL+ and between +12V
terminal and BTL–.)
2. Verify that the protector is operated and LED901 illuminates
red.
3. Verify that the protector is not released and LED901 remains
red even when the short is removed.
4. Verifythat the protectoris released andLED901illuminatesgreen
when the power is turned off and then on again.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINE
WITH MARK 0ON 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 0SUR LES
DIAGRAMMESSCHÉMATIQUES ET LALISTE DESPIÈCES 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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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
