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FILE NO. 120-200171 SERVICE MANUAL VIDEO CASSETTE RECORDER W-512C JUN, 2001 TOTAL CONTENTS 1. Precautions 2. Reference Information 3. Product Specifications 4. Disassembly and Reassembly 5. Alignment and Adjustment 6. Exploded View 7. Replacement Parts List 8. Block Diagram 9. PCB Diagram 10. Schematic Diagrams 1. Precautions 1. Be sure that all of the built-in protective devices are replaced. Restore any missing protective shields. (READING SHOULD NOT BE ABOVE 0.5mA) LEAKAGE 2. When reinstalling the chassis and its assemblies, be DEVICE CURRENT UNDER TESTER sure to restore all pretective devices, including : TEST control knobs and compartment covers. TEST ALL EXPOSED METER 3. Make sure that there are no cabinet openings SURFACES through which people--particularly children 2-WIRE CORD --might insert fingers and contact dangerous voltages. Such openings include the spacing ALSO TEST WITH EARTH PLUG REVERSED GROUND between the picture tube and the cabinet mask, (USING AC ADAPTER PLUG AS REQUIRED) excessively wide cabinet ventilation slots, and improperly fitted back covers. Fig. 1-1 AC Leakage Test If the measured resistance is less than 1.0 megohm or greater than 5.2 megohms, an abnormality exists 7. Antenna Cold Check : that must be corrected before the unit is returned With the unit's AC plug disconnected from the to the customer. AC source, connect an electrical jumper across the two AC prongs. Connect one lead of the ohmmeter 4. Leakage Current Hot Check (See Fig. 1-1) : to an AC prong. Warning : Do not use an isolation transformer Connect the other lead to the coaxial connector. during this test. Use a leakage current tester or a metering system that complies with American