CTC140 (RCA Dimensia) Rapid on/off & No Sound

[Electronic M]

There's a chance if you go on the world radio history website and comb throughout enough ETD magazine scans of issues from the era of this chassis you might find a free schematic. Whether you want to hunt that snipe to save a buck is your call.
Another thing to try is looking up the Sam's number ####-# on eBay and the like to see if you can find an original paper copy for $5.

If you plan on working on a lot of TVs it's advisable to keep an eye out for a bulk sale/giveaway of a TV shopps Sam's library. Sometimes they can be had for free. I've got around 1800 Sam's sets from the beginning until about the end of 1979 as a service library.