I have this Samlex power supply which has no output and I am going through the circuit and I have a couple of questions. I am not real familiar with working on PSU's o here is what I would like to know.
1) Is it normal for 120VAC to be stepped up to 345 VDC after the rectifier on this type of PSU. If so, what is the purpose.
2) This unit has two transformers on it and the second one has no output on it. I went to the input side and there is only about 15VDC on the input side. I compared it to another working unit and it was 60VDC. I traced the circuit back further and found two large switching transistors (2SC3320). I am pretty certain that one is bad as I can see a hairline crack and a black spot on the surface. What is the proper way to test this type of transistor?
3) Does anybody know where I can get this transistor from in Canada or U.S.?
4) Any other valuable information you can give me on this unit? I do not have a schematic, just following circuit board.
Thank you in advance.
1) Is it normal for 120VAC to be stepped up to 345 VDC after the rectifier on this type of PSU. If so, what is the purpose.
2) This unit has two transformers on it and the second one has no output on it. I went to the input side and there is only about 15VDC on the input side. I compared it to another working unit and it was 60VDC. I traced the circuit back further and found two large switching transistors (2SC3320). I am pretty certain that one is bad as I can see a hairline crack and a black spot on the surface. What is the proper way to test this type of transistor?
3) Does anybody know where I can get this transistor from in Canada or U.S.?
4) Any other valuable information you can give me on this unit? I do not have a schematic, just following circuit board.
Thank you in advance.