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  Precautions While Servicing

Introduction to Precautions to Be Taken While Servicing

1)  When static test (i.e. checking of components when TV is in off position) carried over, power card and cable should be disconnected

2)  High voltage filter capacitors should be discharged, before static test,

3)  Throughout dynamic test (measurement of voltage, current in a receiver) we should sit on a wooden chair to prevent electric shock

4)  We should not touch the Lot and final anode with hands or check probes of a millimetre (although we sit in a wooden chain) to prevent heavy shock

5)  Do not discharge the high voltage capacitors when in operation. If it is completed, it would result a heavy burst and also the receiver would becomes defective.

6)  Picture tube should be handled with very carefully. If picture tube would be fragile, implosion occurs. It may wound the close by persons

7)  Do not repair when receiver is functioning

8)  Adjust B+ preset with care. Incorrect adjustment might result a high B+ . It harms power   transistors, LOT, ICs and picture tube in few seconds

9)  When replacing the defective components with the new one, first confirm whether it is a good quality or not.

10) Do not short circuit the close by circuit components when measuring with the help of a multimeter.

11) If IC is employed, measure pin voltages to detect the fault. Test the related components where the pin voltage is not acquired correctly according to the circuit diagram. If those components are defective, they should be replaced at once. If needed, at last IC should be replaced.

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