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Amstrad 586 crazy PSU.

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flaviosr

Experienced Member
Joined
Aug 27, 2016
Messages
268
Location
Turin, Italy
Hello,
I have an Amstrad 586 that is making me crazy. I repaired twice the PSU but it goes on dieing! I have looked over the Internet for a layout (specifically for the PSU but all layouts would be welcome) but I have found nothing.
Can somebody help?
Thank you
 
What is an Amstrad 586? I can find no information about it. There's an Amstrad 5086, which is some 286 clone machine, which is the closest I can find.

It's unlikely you'll find a schematic of the PSU. What exactly is failing, and what are you doing to repair it?
 
Sorry I made a typo. I confirm a 5086, PC5086. I did not start for some dead capacitors in the PSU. The leakage ruined also some traces and a diode. It's not written any info on the diode and I used a 1000V and quite fast one but it got burnt again. Now I used a 1300V and even faster. I hoped the a diagram could help me understand.
 
There are many types of diodes, just throwing a random one in isn't a great idea. It could be the old diode was something like a barrier or zener diode. Replacing those with standard diodes would cause problems.

If you can't find someone that has the same power supply to get a picture, you could try to draw a schematic of the circuitry around the diode to try and figure out its function. Another route you may try restuffing a different power supply into the case of that power supply if its proprietary. Unless that machine has weird power rail voltages, it should be pretty straightforward to do, just lots of time with the soldering iron and moving wires around.
 
It's absolutely not possible to use a not original PSU. It's a weird design... exagerately compact. Take a look at the attached pictures.
Is seems the last repair is resisting... :-|
 

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Looks like a very simple PSU and would likely be an easy fix with the schematic and a few tests. Also it should be possible to work out the specs of that original diode from the schematics.

So it is a matter of sitting down with a pencil & paper, draw out the schematic as a rough copy, after a few iterations draw a neat copy out in a drawing program and post it.
 
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