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Post by mulmany on Mar 28, 2014 21:55:46 GMT -6
Anyone know this psu board manufacturer. It's in a OSA case but does not look to be his design. Need to figure out if it's worth trying to fix the -V rail. I corrected the +V and in turn killed the - rail. I am very bad at reading a board layout. link |
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Post by tonecraft on Mar 29, 2014 14:24:08 GMT -6
Anyone know this psu board manufacturer. It's in a OSA case but does not look to be his design. Need to figure out if it's worth trying to fix the -V rail. I corrected the +V and in turn killed the - rail. I am very bad at reading a board layout. linkThose OSA Power Supplies are notoriously poor quality but it might be fixable. Those single sided board are easy to desolder. There are two "active parts" on each of the bi-polar rails, from what I can see. I would replace Q4 (the black TO-92 transistor in the middle of the board) and the case mounted TO-220 3 Pin Regulator mounted to the case on the right side of the photo. I circled the parts in the photo. Part numbers should be printed on the parts and will be available from Mouser, Digikey or perhaps from a local electronics/surplus shop. Probably $3 in parts so it might be worth a shot.  Jon Erickson www.tonecraftaudio.comjon@tonecraftaudio.com |
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Post by mulmany on Mar 29, 2014 15:26:57 GMT -6
Anyone know this psu board manufacturer. It's in a OSA case but does not look to be his design. Need to figure out if it's worth trying to fix the -V rail. I corrected the +V and in turn killed the - rail. I am very bad at reading a board layout. linkThose OSA Power Supplies are notoriously poor quality but it might be fixable. Those single sided board are easy to desolder. There are two "active parts" on each of the bi-polar rails, from what I can see. I would replace Q4 (the black TO-92 transistor in the middle of the board) and the case mounted TO-220 3 Pin Regulator mounted to the case on the right side of the photo. I circled the parts in the photo. Part numbers should be printed on the parts and will be available from Mouser, Digikey or perhaps from a local electronics/surplus shop. Probably $3 in parts so it might be worth a shot. View AttachmentJon Erickson www.tonecraftaudio.comjon@tonecraftaudio.com Thanks. Unfortunately the part numbers were sanded off. I use this as my extra psu when I need to power both my racks at one time. I had not used it in a while and was thinking of selling it with the 8 space rack, so I tested the voltages out. Now I am thinking I will just build a new supply if I can't get it up and running. Guess I need to look into building a linear power supply. |
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