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RE: Need MCS 3245 power supply repair help/advice

Posted by nutprof (A) on July 10, 2008 at 16:31:46

In Reply to: RE: Need MCS 3245 power supply repair help/advice posted by PJN on July 9, 2008 at 10:35:13:

I see 4 caps that have boiled out, several "dry, overheated solder pads around some resistors, a chip off a high-temp power resistor, and a few other issues.. The devices you are wondering about are "transistors"... they are either NPN or PNP (pointless to go into a electronics lecture here..). They may be fine or not- you really need a "diode test" function on your DVM (I assume it's a digital tester), and the knowledge of how to interpret the readings. They are semi-conductor devices like diodes for testing purposes... In this portion of the circuit they will be common transistors, and very inexpensive (3904's or 3906's or something like that..)... you can replace everything if you wish, but something drew too much current from the power supply in the first place, and it may just smoke again... from your pic you have about $20 of parts to replace on this board (very approximately)... good luck...

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