23 Nov
2022
23 Nov
'22
1 p.m.
NTE seems to turn up these possibilities for a H9501.
https://www.nteinc.com/search/search/search.php?ss360Query=H5901
Don Resor
Sent from someone's iPhone
On Nov 23, 2022, at 12:04 PM, Antonio Carlini via
cctalk <cctalk(a)classiccmp.org> wrote:
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