Starting work on the Sylvania 7140M

[Eric H]

This set is getting on my nerves.

I flipped it up and started checking resistors, nothing really far out so I moved on to heat stressing capacitors.

When I got to C197 on the 6AL5 V16 I could get the Horiz smearing to come and go across the screen as I heated or cooled the Cap, it was a Micamold and I am pretty sure it is Mica, anyhow I swapped it out with something close from a junk chassis, I let it play for a good half hour or more and the problem seemed fixed.

I decided to clean up the mess in the Flyback cage, solder in the 10KV caps correctly and fix the wiring on the width coil.

In the process of fixing the width coil I reversed the polarity on it, I didn't know if that would matter but it seems to matter a lot.

After I put the big CRT back in and fired it up I had several terrible drive lines on the right half of the screen, I was able to adjust them out except one bad one in the dead center of the screen.
I noted that I had to screw the slug nearly all the way out instead of nearly all the way in like it was before I switched the coil around.

Does it make sense that reversing the coil would have this effect? I'm not even 100% sure it's the correct coils ince it's been replaced but I didn't have any serious drive line problems before, there was a little ringing on the left side though.

This picture was taken before I did all that stuff, note the smearing through the picture. Not it doesn't smear but it had a bright lin down the center of the pic and faces distort when the pass through it.