Search found 4 matches

by MartinP
Thu Oct 14, 2021 8:35 am
Forum: Hardware
Topic: Psion XP power circuit schematic, LZ constant buzz, whine, beep. Re-capping
Replies: 6
Views: 219

Re: Psion XP power circuit schematic, LZ constant buzz, whine, beep. Re-capping

I used your version of the Technical Reference Manual when I made the circuit schematic. The power circuit is described in the section beginning on page 42, components are referred to by reference numbers which I have matched to the schematic. The schematic is missing from your manual, but the manua...
by MartinP
Tue Oct 12, 2021 8:20 am
Forum: General
Topic: OPL Challenge
Replies: 25
Views: 596

Re: OPL Challenge

I tried this out, it works well. I think an improvement might be to move the selection line to the lower line when browsing back up the list. I think we can rely on human memory for the previous selection, but it's nice to see the next selection ahead. I wonder if the MENUN command could be used wit...
by MartinP
Tue Oct 12, 2021 7:54 am
Forum: Hardware
Topic: Psion XP power circuit schematic, LZ constant buzz, whine, beep. Re-capping
Replies: 6
Views: 219

Re: Psion XP power circuit schematic, LZ constant buzz, whine, beep. Re-capping

Yes, the aim is to see if one capacitor is usually to blame for this problem. I don't have a faulty Organiser, so I can't do any testing, but I like your suggestion of probing with some good capacitors. A second aim is to reproduce the circuit schematics of the Organiser, they were becoming lost, I ...
by MartinP
Fri Oct 08, 2021 3:15 pm
Forum: Hardware
Topic: Psion XP power circuit schematic, LZ constant buzz, whine, beep. Re-capping
Replies: 6
Views: 219

Psion XP power circuit schematic, LZ constant buzz, whine, beep. Re-capping

The Organiser is a robust device and many are still going strong at 30+ years old, but some users have ocassionally reported a constant buzz/whine/beep coming from their machine. This seems to particularly effect the LZ model, but replacing the electrolytic capacitors is reported to solve the proble...