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Old 12-11-2011, 04:09 PM
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miniman82 miniman82 is offline
First Light: 1952-2011
 
Join Date: Jun 2009
Location: Great Mills, MD
Posts: 4,159
How to troubleshoot IF strip

So the problem with the 21-CT-55 ends up being something amiss with the IF. I was able to figure out that the video looks great when injecting a composite signal, but it's all jumbled with RF. I put the B&K 415 on it, and sure enough the response curve is all jacked. Question is, why? I have a hard time believing something just went out, and I certainly don't want to go messing with the tuning slugs if there's a part that did fail. In my experience IF's are pretty simple, so I need some guidance in how to systematically go through it stage by stage.

Right now I'm providing RF to the antenna terminals on channel 4, picking up the response at the video detector. Is it possible to inject a signal by using the mod marker function, then pick up the signal with the demod probe?
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