TV Typewriter II

This is helpful information. I am assuming that this thing formerly worked, and that everything was installed correctly. However, it is likely that one or more components have failed, or at least gone out of spec. If the values are critical, as you say, I may have to remove these parts and check them individually. Thanks, Louis On Wed, 19 Jun 2002 20:27:07 -0700 (PDT), Loboyko Steve wrote: #I built one of these when I was 15. It didn't work #when I finished it. I sent it to SWTPC for repair. DON #LANCASTER himeself fixed it, and sent me a note thatI #should get a better soldering iron (a solder bridge #and some _horrible, evil_ Molex soldercons (the worst #sockets ever made) were responsible for the problems. # #In any event, I would go down the timing chain; if the #60 Hz is not at some decent level for (the 555's?), #you've got problems. Do you have the (unijunction #transistors?) in correctly - maybe a case difference #between TO-92 and "the other ones, I forget" made of #metal?. I have seen a surprising number of #bad/mismarked 1n914/4148 diodes surplus. Are the caps #and resistors definitely the right values. The R and C #values are all critical around here, and I've seen #mismarked caps. Hopefully, you have at least a scope. # #Funny story: my grandfather, who never graduated the #8th grade, a machinist, helped - that is, made - all #the cases for my projects out of wood (so much for FCC #part B). We were working on his dining room table with #the TVT and a modified 9" TV set (which HE had #repaired(!). A friend of his, a senior engineer at #Zenith, came unpectedly to visit and his eyes just #about fell out of his head. "We've got some stuff like #that at Zenith - but they won't even let me into that #lab, and I've only seen it through a window!!". # # #__________________________________________________ #Do You Yahoo!? #Yahoo! - Official partner of 2002 FIFA World Cup #http://fifaworldcup.yahoo.com