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Do you mean you have no hint of color no matter where you turn the fine tuning knob?
The adjustment procedure for the oscillator is described in pages 36-37 of the RCA factory manual, but if you don't see any color at all -- maybe rolling "rainbow" color bars, for instance -- that procedure may not get you anywhere. (In that event, I would start by doing resistance and voltage checks on the 3.58-MHz oscillator tube to get some clue whether the oscillator is capable of running at all.)
To do the adjustments described in that procedure, you need non-metallic tools -- a screwdriver for L704 and a "diddle stick" with an Allen-like head for the other adjusters mentioned. You may find such tools listed as "TV alignment tools" on eBay.
Phil Nelson
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07-27-2015, 04:38 PM
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