Alice Averlong🏳️⚧️on a scale of 1 to WE COPYRIGHTED THE FUCKING PLASTIC CASE OF OUR DUMB TERMINAL, how many layers of IP law are you on?
it's a well known fact that injection-molding piracy was rampant back in the Reagan era
dang it. I did a decent job cleaning up this part of the case but I accidentally put it down the wrong way and damaged a clip. I'm gonna have to shim & glue it to have it attach properly
This is going to take forever to clean. I basically can only clean one channel at once with a cotten bud, and even that is tricky
significantly cleaner! qtips, paper towels + spudger, and toothbrushing it got basically all of it.
they didn't remove the little peely plastic protective film! This thing is from 1986! that's 38 years of PEELING LEFT UNDONE!
So I resoldered the couple of questionable caps and put it partially back together, but it's still got the RAM issues. I was kinda hoping the caps would alleviate that problem.
I still can't get into the testing mode since I don't have a keyboard for this specific unit, so I can't figure out which memory chip it is that's failed (and there's like 5 on the PCB)
Darn. I soldered in my new caps on my other terminal, and it's still got no vertical deflection.
I'm gonna have to dig into the service manual more and maybe do some oscilloscoping.
I'm gonna have to dig into the service manual more and maybe do some oscilloscoping.
dang it. I have to copies of the WY30 manual. One is badly scanned, and the other... is missing the one page I need.
The good news is that the vertical deflection is built around the TDA1170N, an ST chip for generating vertical deflection for monochrome CRTs. And I've got a datasheet for that, so I can figure out what's going wrong from there
aardvark@foone I’m sure a GPT could fill it in LOL
jhannafin@foone I've not had much luck with fixing vertical collapse with just capacitors Usually it's a transistor somewhere along the way that needs to be replaced.
Farbs@foone Have you tried shaking* it?
*Up and down, roughly 50-60 times a second.
Cecelia@foone It’s dead, Foone! /Star Trek reference
Rue Mohr@foone probably a broken solder joint on the driver chip. Did you make an in-circuit capacitor tester?
Felice@foone It might be worth noting that you don't seem to have full horizontal deflection either.
Though I guess that could just be due to accidentally turning an H.SIZ (or whatever) dial. Does it have H/V size dials?
@Felice yeah. I've not tried adjusting those yet, as I'd need to leave it on to do that, and I don't want to burn a line into this CRT