Sony xm 222 w service manual

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2 TABLE OF CONTENTS 1. GENERAL Connections ........................................................................\ ..... 3 2. DISASSEMBLY 2-1. Bottom Plate ........................................................................\ 5 2-2. Heat Sink ........................................................................\ ..... 6 2-3. Amp Board ........................................................................\ .. 6 3. DIAGRAMS 3-1. Block Diagram .................................................................... 7 3-2. Printed Wiring Board .......................................................... 8 3-3. Schematic Diagram ............................................................. 9 4. EXPLODED VIEW ........................................................... 10 5. ELECTRICAL PARTS LIST ......................................... 11 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-222W 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 PA RT NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY. PROTECTOR OPERATION CHECK Thermal Protect 1. Short across TH801 with the power on. 2. Verify that the protector is operated and LD801 illuminates red. 3. Verify that the protector is released and LD801 illuminates green when the short is removed. 4. Likewise, perform items 1 to 3 for TH802. Over Current Protect 1. Short between the positive and negative sides of the speaker output terminal CN802 with the power on. (Perform this shorting for each channel on L and R.) 2. Verify that the protector is operated and LD801 illuminates red. 3. Verify that the protector is not released and LD801 remains red even when the short is removed. 4. Verify that the protector is released and LD801 illuminates green when the power is turned off and then on again. Offset Protect 1. Short between the +12V terminal of CN801 and the BTL+ or BTL– of the speaker output terminal CN802. (Short between +12V terminal and BTL+ and between +12V terminal and BTL–.) 2. Verify that the protector is operated and LD801 illuminates red. 3. Verify that the protector is not released and LD801 remains red even when the short is removed. 4. Verify that the protector is released and LD801 illuminates green when the power is turned off and then on again. Chassis Short Protect 1. Short between the +12V terminal of CN801 and the chassis with the power on. 2. Verify that the pilot lamp PL801 goes on. 3. Verify that PL801 goes off when the short is removed.