My Brand New CTC-7!

[SwizzyMan]

OK just going to replace ALL ceramic caps on the horiz sync board just for good measure.

[roundscreen]

Originally Posted by SwizzyMan

Says its a 680 uf with no voltage rating?

I looked at the sams and saw the same thing. No voltage rating. Put in a modern 1000 volt cap and see what it does. Take your volt meter and measure the dc voltage with the new cap in place. See what you got. Also a mica cap and ceramic caps are two different animals. You want to check the mica caps and ones that look like them.

[SwizzyMan]

Will do thanks a BUNCH! Will stop by the store tomorrow and pick those up and report back with my findings.

[Electronic M]

Shouldn't that be 680pF not 680uF? Any non-lytic should not be more than .68uF in an RCA product of that vintage.

[SwizzyMan]

Yes they are all in PF not uf

[SwizzyMan]

I am so happy I finally fixed my horizontal hold problem! Replaced all but one of the ceramic/mica capacitors and my hold is now stable. Thanks a whole bunch to roundscreen who suggested I replace the ceramics and the micas. Now back to my color problem. What do you guys suggest?

[SwizzyMan]

OK adjusted L704 and was able to fix the rolling rainbow bars I now have color but the colors on the color bar pattern are all wrong. I tried messing with the tint but it did not give me the correct colors but did change the colors.

[Electronic M]

Could you post a picture of the color bars as they are now?

[SwizzyMan]

Here is what it looks like now note the blue on the far right is very dark because the blue knob wasnt turned up all the way

[roundscreen]

done

[SwizzyMan]

Black and white looks fine. I did accidentally adjust T704 thinking it was L704 at one point.

[roundscreen]

Your picture on that set looks really good. Nice job.. How is the picture on a ota converter?

[SwizzyMan]

There is a lot of magenta/purplish color and certain things but you can make out skin tones and some objects. And a bit of noise in the picture but reasonably clear.

[miniman82]

If you disturbed T704, you threw off the chroma circuit alignment which is responsible for making the correct colors appear on the screen. Hook up the color bar gen and look at the screen with a mirror while adjusting the top and bottom section of T704 till the bars look right.There is also a chroma alignment procedure in the service manual, if you feel like doing it the hard way. Make sure the tint control is in the middle when doing T704 adjustments, or you'll have limited tint range when you're done.

[old_coot88]

Once you've got the bars looking nominally good, get a regular pic on screen showing people's flesh tones. Set the tint control mid-range. If the flesh tones are too green or too purple, tweak the burst phase adjustment T703. It shouldn't take more than 1/8 turn or so either direction get correct flesh tone.
Back in the day, flesh tone was the standard reference for centering the tint range.