Something else I just thought of - your messages imply the computer was working beforehand and just recently failed. This is a dumb question, but have you checked the voltage rails on the board for shorts? I have had at least one power supply come in for repair, and work perfectly on the bench - the customer's computer had a shorted tantalum or something on the motherboard masking as a bad power supply. I've been bit that way more times than I'd like to admit as well. Regards, CJ On Sun, Mar 10, 2024 at 1:30 PM Sentrytv via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
Good afternoon
I believe I have posted before with a question about a keyboard for this computer (386-20), but now I have a question about a schematic diagram for the power supply. I am looking to repair the power supply which is currently dead, outputs about .5 V -.5 V and that’s it. Nothing obviously open or shorted. Somebody did have their hands in it prior to me, replacing or at least soldering various transistors.
My issue is: I would like to find a schematic diagram for this so that I can do repairs myself. Or at the very least, connect an AT power supply or hook up an ATX power supply to get the computer running.
I would need to know what voltages besides the obvious 12 V, 5 V , -12 V ,-5v needed to run this system.
If anyone has experience performing such a task, Please contact me directly if necessary.
I won’t bring it to the workshop unless I can find someone who knows, and I have a schematic diagram in hand.
Thank you Mike Rosen
Sent from: My extremely complicated, hand held electronic device.