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Zenith marketed the access plate on the bottom as the Service-Saver Chassis because it allowed service from the bottom of the set without having to remove the chassis. Components replaced, or measurements taken with the set running, tipped on its side.
With the IF Module removed, can you turn up the brightness and get a raster?
Yes, you can connect your generator 50 ohm video output to C1 with the IF module in the set. Rock or position the tuner slighlty to mid-channel, or you can remove the IF in cable.
Google "Servicing a 1974 Zenith 19DC12 4 tube hybrid color tv" you might find this YouTube interesting. No connection to the author.
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Beam_T
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