I'm trying to fix this for my buddy. The power supply would power up, put out 13.8v but drop to 0v with any load.
He tried to fix it by replacing 3 caps in the "AVR" board, that didnt work.
I fired the parts cannon and replaced 3 "10D1" diodes with 3 "sk3081" diodes I had, a new 35 amp bridge rectifier, I tested all the other components and for the "2SA1012" was subed with a ECG "TIP53" and I replaced that with a "D45H8G" and same results, 13.8 and 0v under load.
I pulled the 2SD717 regulators and they all tested as 2 resistors so I assumed they were dead.
I replaced those with 3 "2STW100" parts and now I did a quick pulse of 120v and its putting out 22VDC
Is it because I used 2STW100 which is darlington type?
I'm out of ideas.
thanks
He tried to fix it by replacing 3 caps in the "AVR" board, that didnt work.
I fired the parts cannon and replaced 3 "10D1" diodes with 3 "sk3081" diodes I had, a new 35 amp bridge rectifier, I tested all the other components and for the "2SA1012" was subed with a ECG "TIP53" and I replaced that with a "D45H8G" and same results, 13.8 and 0v under load.
I pulled the 2SD717 regulators and they all tested as 2 resistors so I assumed they were dead.
I replaced those with 3 "2STW100" parts and now I did a quick pulse of 120v and its putting out 22VDC
Is it because I used 2STW100 which is darlington type?
I'm out of ideas.
thanks
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