Philips back cover free download

File name back cover.pdf

TELEVISION/MONITOR SAFETY GUIDELINES FOR THE PROFESSIONAL SERVICE TECHNICIAN Safety Checks After the original swevice problem has been corrected,a complete safety check 6. New picture tubes are specifically designed to withstand higher operathng should be made. Be sure to check over the entire set, not just the areas voltages without creating undesirable X-radiation. It is strongly where you have worked. Some previous servicer may have left an unsafe recommended that any shop test fixture which is to be used with the new condition,which could be unknowingly passed on to your customer. Be sure higher voltage chassis be equipped with one of the new type tubes to check all of the following: designed for this service.Addition of a permanently connected HV meter to the shop test fixture is advisable. The CRT types used in these new Fire and Shock H azard sets should never be replaced with any other types,as this may result in 1. Be sure all components are positioned in such a way as to avoid the excessive X-radiation. possibility of adjacent component shorts. This is especially important 7. It is essential to use the specified picture tube to avoid a possible X-diation on those chassis which are transported to and feom the service shop. problem. 2. Never release a repaired unit unless all protective devices such as 8. Most TV receivers contain some type of emergency "Hold Down" circuit to insulators, barries, covers, strain reliefs, and other hardware have been pervent HV from rising to excessive levels in the presence of a failure installed in accordance with the original design. mode. These various circuits should be understood by all technicians 3. Soldering and wiring must be inspected to locate possible cold solder servicing them, especially since many hold down circuits are inoperative joints,solder splashes,sharp solder points, frayed leads, pinched leads, as long as the receiver performs normally. or da