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Service Manual C7-C8 Chassis CONTENTS PAGE Safety Instructions Technical Specifications Special Features Remote Control Preperations Operating the TV IC Datasheets&Specs Pin Voltages of IC's Electrical and Service Adjustments Channel Frequency Tables Part List Circuit Diagrams Attached -2- 1. SAFETY INSTRUCTIONS ^ and each exposed metallic cabinet part on GENERAL GUIDELINES the receiver, such as screw heads, aerials, connectors, control shafts etc. When the 1. It is advised to insert an isolation transformer exposed metallic part a return path to the in the AC supply before servicing a hot chassis the reading should be between chassis. 4Mohm and the 20Mohm. When the exposed metal does not have a return path 2. Potentials as high as 33KV are present when to the chassis, the reading must be infinite. this receiver is in operation. Operation of the receiver without the rear cover involves the LEAKAGE CURRENT HOT CHECK danger of a shock hazard from the receiver power supply. Servicing should not be 1. Plug the AC cord directly in to the AC attempted by any one who is not outlet. Do not use an isolation transformer competent with the precautions necessary for this check. when working on the high voltage 2. Connect a 2Kohm 10W resistor in series with equipment. Always discharge the anode of an exposed metallic part on the receiver the tube. and an earth, such as a water pipe. 3. Use an AC voltmeter with high impedance 3. When servicing observe the original lead to measure the potential across the resistor. dress in the high voltage circuits. If a short 4. Check each exposed metallic part and circuit is found, replace all the parts which check the voltage at the each point. have been overheated or damaged by the 5. Reverse the AC plug at the outlet and short circuit. repeat each of the above measurements. 6. The potential at the any point should not