Emerson 6420FE service manual

20" COLOR TELEVISION

SERVICE MANUAL

6420FE EWF2004

Contents

Main IMPORTANT SAFETY NOTICE TABLE OF CONTENTS SPECIFICATIONS <TUNER> <DEFLECTION> <VIDEO & CHROMA> <AUDIO> IMPORTANT SAFETY PRECAUTIONS Safety Precautions for TV Circuit + _ EARTH GROUND Page Precautions during Servicing Safety Check after Servicing 1. Clearance Distance 2. Leakage Current Test STANDARD NOTES FOR SERVICING Circuit Board Indications Pb (Lead) Free Solder How to Remove / Install Flat Pack-IC 1. Removal Page 2. Installation Example : Instructions for Handling Semiconductors 1. Ground for Human Body 2. Ground for Workbench <Incorrect> <Correct> CABINET DISASSEMBLY INSTRUCTIONS 1. Disassembly Flowchart 2. Disassembly Method Reference Notes in the Table [1] Rear Cabinet [2] CRT CBA [3] Main CBA [4] CRT Page 4-3 L2401DC TV Cable Wiring Diagram Fig. 5 ELECTRICAL ADJUSTMENT INSTRUCTIONS Test Equipment Required How to make Service remote control unit: How to set up the service mode: Service mode: 2. Initial Setti ng 3. Setting for BRIGHT, CONTRAST, COLOR, TINT, and SHARPNESS data Values 4. H f0 Adjustment 5. Black Stretch Control Adjustment 6. Purity Check 7. SD Check Mode SD Check mode (Factory mode) 8. H. Position Adjustment 9. V. Size Adjustment 10. V. Position Adjustment 11. Software Reset 12. Cut-off Adjustment 13. White Balance Adjustment Color Analyzer Fig. 3 14. Sub-Brightness Adjustment 15. Focus Adjustment 16. Purity Adjustment White Black Fig. 4 This bar just visible 17. Convergence Adjustment 6-1 BLOCK DIAGRAMS MAIN CBA System Control Block Diagram L2401BLS 6-2 L2401BLIF IF/Video Block Diagram MAIN CBA VIDEO SIGNALRF/IF SIGNAL AUDIO SIGNAL 6-3 Audio Block Diagram SUPPLY POWER TO /STANDBY CRT/H.V. Block Diagram VIDEO SIGNAL CRT CBA MAIN CBA L2401BLCRT HOT COLD L2401BLP hot GND as a common terminal. +B TP601 (TO PIN79 OF IC111) SCHEMATIC DIAGRAMS / CBA'S AND TEST POINTS Standard Notes Note: Note of Capacitors: Temperature Characteristics of Capacitors are noted with the following: LIST OF CAUTION, NOTES, AND SYMBOLS USED IN THE SCHEMATIC DIAGRAMS ON THE FOLLOWING PAGES: Page Page Page Page FOCUS-VR (UPPER SIDE) SCREEN-VR (LOWER SIDE) +B VR661 +B ADJ TP601 Main CBA Top View 7-12 7-11 BL2700F01012-1 NOTE : The voltage for parts in hot circuit is measured using hot GND as a common terminal. 4A/125V Main CBA Bottom View CRT CBA Top View CRT CBA Bottom View WAVEFORMS Page WIRING DIAGRAM CRT CBA BL2700F01012-2 L2401WI 9-1 MAIN CBA IC PIN FUNCTIONS IC111 (TV Micro Controller) Page EXPLODED VIEWS Cabinet 11-1 11-2 L2401CEX Packing 20040405 12-1 L2401CA MECHANICAL PARTS LIST Ref. No. Mark Description Part No. Model Mark Ref. No. Mark Description Part No. PACKING ELECTRICAL PARTS LIST MAIN CBA MMA CBA CAPACITORS 20040405 13-2 L2401EL 20040405 13-3 L2401EL CONNECTORS DIODES 20040405 13-4 L2401EL Ref. No. Desc ription Part No. ICS COILS TRANSISTORS 20040405 13-5 L2401EL RESISTORS 20040405 13-6 L2401EL 20040405 13-7 L2401EL Ref. No. Descripti on Part No. SWITCHES MISCELLANEOUS CRT CBA 20040405 13-8 L2401EL CAPACITORS CONNECTOR DIODES