23 Nov
2022
23 Nov
'22
12:04 p.m.
On 21/11/2022 21:45, Antonio Carlini wrote:
I have two more I can open up and look at, but I cannot get to them
tonight and I'm probably out tomorrow too. But I think I can get to
those other two supplies on Wednesday. Hopefully at least one of them
will be readable! Otherwise I can desolder the diode from one of the
other two and hopefully find a useful marking.
Turns out I have three more PSUs ... and the diode markings are
unfortunately invisible on all but one. That one is this one:
https://drive.google.com/file/d/1TeGTcBBv7KecMJ2CmNcR0O-tb3jZigy6/view?usp=…
It's not really visible there either but with the PSU out and one end
desoldered I can see that it is marked H9501. I can also see that it
doesn't conduct either way, which might mean that this PSU is the
non-working one I know I have. Obviously the capacitor (820uF 250V
electrolytic) is going to need replacing (might as well do both). But
first I need to remove them and see what (if anything has happened)
underneath.
This now goes back into my queue (behind the MicroVAXes and the H7868B
PSU modules) so if you fix yours before I get to mine, please let me
know what you did :-)
Antonio
--
Antonio Carlini
antonio(a)acarlini.com