RCA CTC-11 Chroma Alignment Issues

[TonyP]

My first question is, where is the mixer grid test point on the tuner? Ive found two test points. one goes to pin 2, and another to pin 3 of the 6EA8.

MY first attempt was to use the Sencore SM 158. I biased off everything the RCA service manual says. I connected everything like the RCA service anual says. The first step is to inject a signal directly into the bandpass amp to pre set the bandpass xformer. i got no response curve on the scope. Then i tried connecting the RF cable to the antenna terminals. Still no response curve. I used the Sencore supplied detector clipped to the grid of the 12AZ7 demodulator.

Ok. Decided to break out the RCA Gear. I have the WO-91A scope. WR-69A seep, and I used my Precision E-200c for a marker gen. I also used the WG-304A RF modulator and the WR-295B video marker box.

SO, first step is to use the sweep gen and the marker box to inject a signal directly into the bandpass amp. Video detector probe on the grid of the 12AZ7 demodulator. ok. got a response curve on the scope.

THen, i go and change the setup to inject a signal into the mixer grid, set everything up for VSM alignment, dector probe on the 12aZ7 grid. no repsonse curve at all.

I did not make the video detector probe like is shown in the RCA service notes. i am using the dector probe that came with the BK 415. My other thought is my front end of the tv is dead, but it is a working tv, unsless i did something when i set up the bias voltages.

IF you go to section 6 of the RCA TV Home Study Course, it actually has the CTC-11 alignment instructions and a schematic, So, i used this as my guide. https://worldradiohistory.com/Archiv...ourse-1966.pdf

I am attempting alignment only becasue when i went to check and tweak the burst phase, i tweaked the choma bandpass transformer by mistake. so, i wanted to recheck to see if it was off.