RCA CTC-16XH Smearing Issue

[Jon1967us]

Originally Posted by old_tv_nut

Peaking coils will only affect very short transients, near edges. Not the case here.

That streaking is a very long time constant, lasting for most of a scan line.

The important clues are:

• Injected composite video into circuit, just before the 1st Video Amp, and observed smearing, leading me to believe the defective component should be after that stage.
• Injected composite video into circuit, just before the 2nd Video Amp, and observed a reversed fainter image, but didn't notice smearing - not that there couldn't have been any, I just didn't see it, leading me to believe offending component to be before this stage.

Scratching my head a bit to identify a component with such a long time constant.

Wish they listed the inductance value of L10, but assuming it's OK, how about R57 220 ohm and C21, .001uf (screen bypass) or C24 and R61 (connect to the sync separator).

All these caps have been replaced. OOT Resistors too. I may have to check C22, the 7pF. Don't recall if I replaced that one.

[old_tv_nut]

Originally Posted by Jon1967us

All these caps have been replaced. OOT Resistors too. I may have to check C22, the 7pF. Don't recall if I replaced that one.

Such a small cap cannot produce such a long smear. C7 couples only high video frequencies to the chroma circuits.

I would nose around the AGC / sync separator / noise inverter, since feedback circuits can do weird things and make it difficult to figure out where in the loop the problem is. Check voltges in that area, and substitute V6 if you have a spare. The fact that the smear disappears when you couple to the 2nd video is a strong indication that the problem is in first video or the above stuff that is fed from the first video.