Sony xm 502 z service manual

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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.Verify that the protector is released and LED901 illuminates green 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.Verify that the protector is released and LED901 illuminates green 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.Verify that the protector is released and LED901 illuminates green when the power is turned off and then on again. SAFETY-RELATED COMPONENT WARNING!! COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 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 Ã- LA SÉCURITÉ!! LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 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.