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If injection IF signal into the IF circuits isn't giving you signal then your IF is defective and you should worry about your IF before you even look at the tuner.
One of my CTC4 sets the alignment was abominable...sound, luminance and color could all be obtained with fine tuning adjustment, but I could only get one at a time depending on adjustment....the IF adjustments were fine and it was a resistor problem...I unsoldered one end of EVERY IF resistor and changed every one that was off tolerance or borderline and the IF started working like new.
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