Thank-you very much for replying. I think I am going to try to get the repairman back out to fix it before I would try anything. It sounds like if you don't know what you're doing you could easily get zapped and I am a total novice with electronics. If he doesn't come out or gives me a hard time, does this focus that I am adjusting with a flathead screwdriver look like an actual knob or just a screw ? Is it easy to find/easily reconizable ? Thank-you again.

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