When the exposed metal has no return path to the chassis the reading must be infinite.An other abnormality exists that must be corrected before the receiver is returned to the customer.
If the exposed metallic part has a return path to the chassis, the measured resistance should be between 1 M and 5.2 M. Place the AC switch in the on position, connect one lead of ohm-meter to the AC plug prongs tied together and touch other ohm-meter lead in turn to each exposed metallic parts such as antenna terminals, phone jacks, etc. Leakage Current Cold Check(Antenna Cold Check)With the instrument AC plug removed from AC source, connect an electrical jumper across the two AC plug prongs. Keep wires away from high voltage or high temperature parts.īefore returning the receiver to the customer,Īlways perform an AC leakage current check on the exposed metallic parts of the cabinet, such as antennas, terminals, etc., to be sure the set is safe to operate without damage of electrical shock. When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1 W), keep the resistor 10 mm away from PCB. If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it with the specified. It will also protect the receiver and it's components from being damaged by accidental shorts of the circuitry that may be inadvertently introduced during the service operation. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal injury from electrical shocks. Do not modify the original design without permission of manufacturer.Īn isolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC power line.
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These parts are identified by in the Schematic Diagram and Exploded View.It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock, Fire, or other Hazards. Many electrical and mechanical parts in this chassis have special safety-related characteristics. All rights reserved.Only for training and service purposes 3 - LGE Internal Use Onl圜opyright LG Electronics. All rights reserved.Only for training and service purposesĬONTENTS. 2 - LGE Internal Use Onl圜opyright LG Electronics. Recommended Troubleshooting & Repairing Guide: Printed in KoreaP/NO : MFL68026206 (1402-REV00)ĬAUTIONBEFORE SERVICING THE CHASSIS,READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
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