Quote:
Originally Posted by Crist Rigott
Just an update on the alignment.
I decided to check the tuner and work back through the TV. When checking the tuner on channel 3 it wouldn't align. The frequencies were too far off. I then decided to check channel 4 and sure enough the freq. were much closer, so I decided to use channel 4 instead of channel 3. Channel 4 aligned perfectly with the waveform and frequencies where they should be.
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So if I'm following this you injected the correct rf carrier signal into the antenna terminals for the selected channel? If so possibly the rf and oscillator coils for Ch 3 are interchanged with some other channel on the tuner drum.
Quote:
Originally Posted by Crist Rigott
I used a meter to align the first step in the 4.5mc audio section. But the 2nd step didn't work out so well. I never could get the meter to zero out. I hooked up the sweep generator and o'scope and peaked per step 1, but never could get the cross over pattern in step 2. I ended up just tweaking by ear.
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Were you using a vacuum tube voltmeter? Otherwise a standard 20,000 ohms per volt meter will load that circuit and you'll never get it to zero. You could also use a scope set to DC coupling.