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I'm just replacing back the posts that got deleted ...
#7
09-05-2009, 05:34 PM
Adam
1965 Zenith
Join Date: Oct 2005
Location: Ann Arbor, MI
Posts: 1,287
I just finished the recap on the 14" set. These early circuit board sets are not the easiest to work on, but I managed it without any problems this time. I desoldered all the caps with wick before I pulled them out, and used a temperature adjustable soldering iron set at around 800. At least this set didn't have any metal cans soldered to the board, that's always the worst. The boards are in 2 parts screwed to the metal chassis, and by unscrewing them, it was possible to work on them by tilting them down without actually removing them.
I still have to check the tubes and other stuff before I try it out. The vertical output transformer doesn't look too good, but it checks out not open or totally shorted with the ohm meter.
I tried to post new chassis pics in the gallery, but kept getting some error message.
#8
09-05-2009, 06:36 PM
DaveWM
AK Member
Join Date: Feb 2009
Posts: 404
I just finished one of the 14" (actually still a part on the bench, need to install some feet on it). I am going to put a polarized plug, better than a 50/50 that way (still not 100% since there could be a miss wired outlet).
I did all the caps from the top as I did not feel like unscrewing the boards.
prob 6-7 wax caps IIRC.
It had some work done already (j hooks) so I did not feel the need to do a neat job.
no bad out of spec resistors. cut the cans off just past where the clamp holds them, restuffed. Put in a new fuseable resistor (old one was open).
I took the CRT out so I could test it with out having to reinstall the chassis all the time.
needed a couple tubes. After I learned about the importance of the ion trap position I got a nice clean picture. I am checking over a slight white line (vertical wide and very faint on dark pics) that I think I have licked after replacing a tested good HO tube with a NOS tube.
The plastic safty window is kinda messy, I would like to use a plastic polish to get some of the fine scratches out.
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