Fixing the signs of time
Finally I got everything delivered. A couple of caps, a new, hopefully quieter fan and of course the RIFAs which were the reason to pull everything apart.
Putting all the caps in is a nice and easy job (just notice – they are all oriented polarity wise in the same direction – nice one). Also the RIFAs are not a big deal.
The new fan is a drop in replacement – just needed to transplant the plug to the new one. Any yes – it is definitely quieter.
Also the new battery is pin-compatible. I did not change the charging circuit as it pretends to be a drop in replacement according to the data sheet of Varta – although it is NiMH instead of NiCd.
Was it worth it?
I tested all the caps and as you can see, one unidentified bad cap was found.
But all the other caps were still good hence HP used high quality 105° ones in the past.
The second RIFA (the Y2) one had also cracks it in, but was not blown…but I guess this would have been the next fail.
Putting it all together…and tadaaaaa…it still works.
Of course I gave the case and everything else a very good clean while it was separated from the electronics and the CRT tube.
What’s next?
I still struggle to get the Async Terminal Application of the 4951C to work. I used every hint I could find, but still „Application Denied“ which points back to a copy protection scheme.
However I have to pause my efforts here for a while because a new beauty (which is not that pretty anymore) arrived in town: a 4957A I was able to acquire from France.
This one will keep me busy at it is in pretty bad shape. But this is something for the next post.