Looking for an image of a KCS-97 chassis - Videokarma.org TV - Video

rca21d645 · #1 04-13-2020, 11:20 PM

Hello, this may sound like an odd request but I have began a recap of the paper/wax capacitors on an RCA 21D-645 television, and I think I messed up when soldering one of the replacement capacitors. I realized after the fact that I forgot to take a picture of the underside before I started, and while any picture sent won't be the exact same television, I would greatly appreciate a photo of the underside of a KCS-97 chassis. If this matters the numbers/letters stamped on the back specify mine as a KCS-97 Dx 61 0 L4 RVB 274. The attached images are from a few years ago when I first bought the set.

Thank you.

Kevin Kuehn · #2 04-13-2020, 11:53 PM

Welcome to VK

Here's a picture of the capacitor identification page from Sams 312-10. If you can find the caps in question I can look up the value for you. I suppose I could scan the entire folder for you if you can pm me your email.

https://live.staticflickr.com/65535/...25644614_b.jpg

rca21d645 · #3 04-14-2020, 12:09 AM

Quote:

Originally Posted by Kevin Kuehn

Welcome to VK

Here's a picture of the capacitor identification page from Sams 312-10. If you can find the caps in question I can look up the value for you. I suppose I could scan the entire folder for you if you can pm me your email.

https://live.staticflickr.com/65535/...25644614_b.jpg

Thank you, but I don;t think the problem is a capacitor value, I think its that I didn't properly install one of the caps. The advice I got was to check the horizontal but whenever I check the spots I soldered, I don't see anything off on the schematics, here's an image of what it looks like.

Kevin Kuehn · #4 04-14-2020, 12:36 AM

Does adjusting the horizontal linearity have any influence on that? It's hard to tell just what's going on there without an image. Wouldn't hurt to try another damper tube.

CJVx · #5 04-14-2020, 07:48 AM

I had a similar picture when a stray solder glob dropped across a connection and brought the negative voltage to about 25% of what it should have been. Basically the whole picture shrank, vertical was able to be adjusted to fill the screen, but horizontal showed the shrinkage. Also no sound. I finally found the shorted connection and everything was back to normal...for that set anyway.

rca21d645 · #6 04-14-2020, 12:03 PM

Quote:

Originally Posted by CJVx

I had a similar picture when a stray solder glob dropped across a connection and brought the negative voltage to about 25% of what it should have been. Basically the whole picture shrank, vertical was able to be adjusted to fill the screen, but horizontal showed the shrinkage. Also no sound. I finally found the shorted connection and everything was back to normal...for that set anyway.

That sounds almost exactly like whats wrong with mine, I guess I'll check for stray solder bits, thank you.

rca21d645 · #7 04-14-2020, 03:01 PM

Quote:

Originally Posted by Kevin Kuehn

Does adjusting the horizontal linearity have any influence on that? It's hard to tell just what's going on there without an image. Wouldn't hurt to try another damper tube.

The main reason I wanted a photo of someone else's chassis is because the photos in the Sams are hard to make out with the grainy quality.

rca21d645 · #8 04-14-2020, 03:03 PM

I also should specify this is my first try at restoring an all tube television

TonyP · #9 04-16-2020, 09:57 AM

If you are not willing or able to make some voltage checks, you need to find someone else to work on it. Ive seen the vidoes you posted on facebook. you have sound. that means the tuner is working and some signal is getting through. i think the issue is in the horizontal deflection or the horizontal oscillator. the fact it was working somewhat before recap and it sint now, i would suspect a miswired component, a solder blob creating a short, anything that you could ahve moved or inadvertantly disconntrected or broke during recap. i want you to measure the grid voltage on the horizontal output tube so we can see if it has excessive horizontal drive becasue that could be what is giving you a picture like that. it also looks like horizontal foldover. i want to get the raster in first. if we can get a proper sized raster, then we know what we are dealing with easier.

what type of caps did you use in the recap? did you any ceramic disk type to replace the old paper/wax ones? if you did, get those out and use standard film caps. https://antiqueradio.org/recap.htm