I'm trying to repair an SMPS and have narrowed down the issue to a particular circuit on the board.
I believe this is what is called the startup circuit? - The board has a large bridge rectifier, relay caps etc. Then there is this smaller circuit with its own (much smaller) bridge rectifier, caps and transformer. it seems to control a relay with would then feed AC power to the large bridge rectifier.
There is 340v DC coming from the bridge rectifier which I can trace all the way to the transformer. Caps have all been replaced, resistors and diodes all test ok.
Is it common for the OB2358 to go bad?
Also, If it's not possible for me to repair the circuit, I'm considering removing the transformer and replacing it with a small standalone smps. I believe this should work? If I go down this route, I need to know the DC output of the transformer. Is there any wat to work this out?
I believe this is what is called the startup circuit? - The board has a large bridge rectifier, relay caps etc. Then there is this smaller circuit with its own (much smaller) bridge rectifier, caps and transformer. it seems to control a relay with would then feed AC power to the large bridge rectifier.
There is 340v DC coming from the bridge rectifier which I can trace all the way to the transformer. Caps have all been replaced, resistors and diodes all test ok.
Is it common for the OB2358 to go bad?
Also, If it's not possible for me to repair the circuit, I'm considering removing the transformer and replacing it with a small standalone smps. I believe this should work? If I go down this route, I need to know the DC output of the transformer. Is there any wat to work this out?