Quote:
Originally Posted by rcaman
classic sign of bad power supply caps. great set.  |
ditto that PS caps. Sometimes if you have trouble not getting the vert to fill out (prob just the low power test in your case) the cathode bypass cap on the vert board may be bad, but most of the time its fine too. there are a couple HV caps in the vert feed back that can be problems like a .0082 2kv film.
that era has pretty good film caps so it should not take much to get it worked out. there is a sand resistor down by the choke mounted to a term strip, that strip gets real toasty, can break easy, just leave it be.
check the resistor in the boost supply to the vert, think its a 100k, often will drift high hurting vert height (the vert multivibrator uses boost voltage thru the height or lin pot, not sure about how rca lables those).
One thing you do not want to do is a shot gun replacement of film caps, just not needed, and the pcb's are often cooked, do not need the stress. oh and last thing watch out for the jumper wires on the top of the chroma board, they tend to corrode, when that happens the diff amps lose plate voltage.