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Icom Tuning?...Help Please
Hi,
I have an Icom IC-290A that I am working on...The problem being that when I turn the tuning knob it doesn't change frequencies,it acts as if the knob is slipping. After determining that it wasn't the knob slipping I proceeded to disassemble the front to get at the tuning potentiometer. If your familiar with this unit you know that the potentiometer is continuous and has teeth that catch when you turn the knob to make tuning easier. Now when I hook up my ohm meter to the wiper and to either end of the potentiometer all I get is an OL reading and when I turn the shaft the reading jumps around wildly. If I connect the meter to the wiper and to the case of the(I am assuming this is correct?) potentiometer I should get a reading of Zero ohms but again the only reading I get is OL. Am I safe in saying that the potentiometer is bad? If so how do I go about figuring out what type of potentiometer I need to replace the bad one? The schematic doesn't tell me what value it is and there isn't a parts list or part number either. I hope I have made myself clear enough to be understood,if not please let me know so I can try and make things clearer. Any help on this would be greatly appreciated. Thank you |
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