Panasonic rx m 50 m 3 service manual
This is the 39 pages manual for panasonic rx m 50 m 3 service manual.
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Extracted text from panasonic rx m 50 m 3 service manual (Ocr-read)
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1 Safety Precautions 3 1.1. General Guidelines 3 1.2. Caution for AC Cord (For GS only) 4 1.3. Before Use 5 1.4. Before Repair and Adjustment 5 1.5. Protection Circuitry 5 2 Prevention of Electro Static Discharge (ESD) to Electrostatically Sensitive (ES) Devices 6 3 Warning 7 3.1. Service caution based on legal restrictions 7 4 Accessories 8 5 Operating Instructions Procedures 9 5.1. Main Operation Buttons 9 6 Assembling and Disassembling 10 6.1. Caution 10 6.2. Disassembly Procedures 10 6.3. Disassembly Flowchart 10 6.4. Main Parts Location Diagram 11 6.5. Before Disassembly 11 6.6. Disassembly of Front Cabinet 12 6.7. Disassembly of Speaker 12 6.8. Disassembly of Deck Mechanism 13 6.9. Disassembly of Main P.C.B. 13 6.10. Disassembly of Power P.C.B./ Battery P.C.B. 14 6.11. Disassembly Gear Knob 14 6.12. Disassembly for Pointer Guide 14 6.13. Disassembly and assembly for Cassette Compartment 15 6.14. Rectification for tape jam problem 15 7 Service Position 16 7.1. Checking Procedures 16 7.2. Checking and Repairing of Main, Battery, Mic and Power P.C.B. 16 8 Adjustment Procedures 17 8.1. Tuner Section 17 8.2. Deck Section 19 8.3. Alignment Point 20 9 Wiring Diagram 21 10 Notes of Schematic Diagram 23 11 Schematic Diagrams 25 12 Printed Circuit Board Diagrams 27 13 Illustration of ICs, Transistors and Diodes 29 14 Exploded Views 30 14.1. Deck Mechanism Parts Location 31 14.2. Cabinet Parts Location 33 14.3. Packaging Materials and Accessories 35 15 Replacement Parts List 36 CONTENTS Page Page 2 RX-M50M3GU / RX-M50M3GC / RX-M50M3GS / RX-M50M3GS1
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1 Safety Precautions 1.1. General Guidelines 1. Whenservicing observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit. 2. After servicing, ensure that all the protective devices such as insulation barriers, insulation papers shields are properly installe d. 3. After servicing, check for leakage current to prevent from being expose d to shock hazards. 1.1.1. Leakage Current Cold Check 1. Unplug the AC cord and connect a jumper between the two prongs on the plug. 2. Using anohmmeter measure the resistance value, between the jumpered AC plug and each exposed metalliccabine t part on the equipment such as screwheads, connectors, control shafts, etc.When the exposedmetallic part has a return path to the chassis the reading should be between 1MΩand 5.2MΩ. When theexpose d metal does not have a return path to the chassis, the reading must be . 1.1.2. Leakage Current Hot Check (See Fig. 1) Fig. 1 1. Plug the AC cord directly into the AC outlet. Do not use an isolatio n transformer for this check. 2. Conne ct a 1.5kΩ, 10 watts resistor, in parallel with a 0.15µF capacitors, between each expose d metallic part on the set and a good earth ground such as a water pipe, as shown in Fig. 1. 3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, to measure the potential across the resistor. 4. Check each expose d metallic part, and measure the voltage at each point. 5. Reverse the AC plug in the AC outlet and repeat each of the above measurements. 6. The potential at any point should not exceed 0.75 volts RMS. A leakage current tester (Simpson Model 229 or equivalent) may be used to make the hot checks, leakage current must notexceed 1/2 milliamp. Should the measurement outside of the limits specified, there is a possibility of a shock hazard, and equipment should be examine and reached before it is returned to the customer. 3 RX-M50M3GU / RX-M50M3GC / RX-M50M3GS / RX-M50M3GS1