Quote:
Originally Posted by old_tv_nut
All the waveforms from V4 and V5 look like they have a bunch of intermittent spikes where sync should be?? Not sure what I'm looking at. What was the video signal, and was it coming through the antenna?
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Yes, the signal was RF coming thru the antenna terminals. I think the resolution isn't the greatest on the little Tek 224, maybe why it appears that way? Might need to go back over with my big Tek.
Voltage checks on V4 ok except pins 8 and 9 which were about 70 and 50 v too high, respectively.
Voltage checks on AGC V6 appear ok, except maybe pin 7 which was about 10v high. I need to mull over this data to figure out what it means, but I think there's a connection between the AGC (as someone else may have alluded to earlier) and the 1st video stage...
What's totally puzzling is that the 100v and 390v rails going to V4 test ok
05-27-2021, 11:17 PM
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