A bit of fun today on the bench.
First I reassembled the first one of roughly three IBM Thinkpad T42 laptops from the box of parts I have. I have one good one that I use for the times I need an old laptop with a real parallel port or dual PCMCIA slots etc which works great, so time to build up a couple working laptops to sell off.
Then it was time to fix a Philips PM 5518-TX VPS colour TV pattern generator. I have two and this one with the RGB output option wasn't working but it just turned out to be the main logic board that needed to be reseated, so it got a bit of Deoxit on the card edge connector for good measure. The second one (without RGB output) will get sold off.
And finally, I dug out this Trio (Kenwood) CS-1577 30MHz analogue dual-trace scope.
I bought it
years ago, like maybe 6 years for peanuts, I think maybe 1000yen, or less than US$10... and it had some new capacitors installed and a bunch of stuff deoxited by me at the time, but I never got around to reassembling it properly.
I somewhat reassembled it a few months back and found no trace, so now I want to get rid of it I thought I'd get it working..
So far I have found it works fine in X-Y mode with a beautiful trace, so HV works, the input board works, and the PSU is ok.
But when I try to use it in Y-V mode, no trace...
After poking around at the panel controls I found if I hit the trigger reset button a trace briefly flashes on the screen, showing the expected waveform but only for a brief moment.
Ok, so the horizontal is working, but the trigger is somehow busted. Luckily I have the schematics, so time to go huntin'..........
![Broken! :-BROKE](https://www.eevblog.com/forum/Smileys/default/smiliey_scope_broke.gif.pagespeed.ce.z9RuKVWKjY.gif)