Zenith 25EC58 Restoration Thread

[TinCanAlley]

I removed the IF module and connected the video out of my generator to C1 which is noted as being the picture detector output. The generator's manual says to connect its video output after the detector, so this is the correct point. When I did, I had to set the output on the generator to max in order to see anything. What I got was dim and the horizontal and vertical was not stable.

Looking over the schematic, the detector out is 6.99V. From reading up, the composite signal is a max of 1V. The detector's out also feeds the video processor module and that is 6.24V. The video processor module sends out H and V synch as well. So does the composite signal I'm feeding it need to go through the video processor as well to? I see 3 destinations for the detector output.... The video processor module, the chroma module and the section with the video amps, vertical blanker, blanker amp, etc.

So am I correct that the composite I feed needs to hit all those points and can't just simply wander into the video outputs. The signal needs to drive the vertical and horizontal modules, etc?

If this is the case, how do I duplicate the voltage on the detector output for all the other modules? The odd thing is, the manual for my generator says nothing about removing the IF module or anything other than connecting the lead to a point after the detector. So maybe there is something in the circuit of the generator to allow it to inject its signal over the detector's?

Such a crazy day.