Philips 109s2 CM25[1].part1 free download

File name 109s2 CM25[1].part1.rar

Go to cover page 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 Fire and Shock H azard to the shop test fixture is advisable. The CRT types used in these new 1. Be sure all components are positioned in such a way as to avoid the sets should never be replaced with any other types,as this may result in possibility of adjacent component shorts. This is especially important excessive X-radiation. on those chassis which are transported to and feom the service shop. 7. It is essential to use the specified picture tube to avoid a possible X-diation 2. Never release a repaired unit unless all protective devices such as problem. insulators, barries, covers, strain reliefs, and other hardware have been 8. Most TV receivers contain some type of emergency "Hold Down" circuit to installed in accordance with the original design. pervent HV from rising to excessive levels in the presence of a failure 3. Soldering and wiring must be inspected to locate possible cold solder mode. These various circuits should be understood by all technicians joints,solder splashes,sharp solder points, frayed leads, pinched leads, servicing them, especially since many hold down circuits are inoperative or damaged insulation ( including the ac cord).Be certain to remove as long as the receiver performs normally. loose solder balls and all other loose foreign particles. 4. Check across-the-line components and other components for physical Leakage Current Cold Check 1. Unplug the ac line cord and connect a jumper between the two prongs of evidence of damage or deteriortion and replace if necessary. Follow the plug. original layout,lead length, and dress.