Got this OKI ML-590 dot Matrix printer DOA with a note on it saying "no power".
Sure enough. Does not power up. No lights, no startup sounds. I've ruled out the plug switch and fuses, no interlocks on the model that prevent power on. The PS is definitely getting power from the wall.
Removed the cover and had a good listen. No noise of any kind from the power supply, and no bulging caps (though perhaps one of you Jedi masters can spot one the photos are good resolution).
On closer examination I see some charring below a set of three light blue components on the top of one of the boards. There are also some charred looking resistors on this same part of the board.
Any thoughts on what's wrong with this board and wether swapping a few components would put me back in business?
Does the charring make this a lost cause?
I think that's my issue, but I'm not sure.
Sure enough. Does not power up. No lights, no startup sounds. I've ruled out the plug switch and fuses, no interlocks on the model that prevent power on. The PS is definitely getting power from the wall.
Removed the cover and had a good listen. No noise of any kind from the power supply, and no bulging caps (though perhaps one of you Jedi masters can spot one the photos are good resolution).
On closer examination I see some charring below a set of three light blue components on the top of one of the boards. There are also some charred looking resistors on this same part of the board.
Any thoughts on what's wrong with this board and wether swapping a few components would put me back in business?
Does the charring make this a lost cause?
I think that's my issue, but I'm not sure.
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