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Its odd as heck. The schematic shows a 5.5v source feeding 1 side ofvthe VCO. There is an output that goes to pin 1 IC201 and it says 2.7v. Hand written. Something doesnt make sense.
Update: tp1 is not adjustable. Its solid at 5.5v and its supposed to be adjusted to 3.6v. When turning the VCO, i can hear shifting as if dialing in a portable AM pocket radio but nothing audible just hissing. Then, there are more issues. The tx light is flickering on and off while in rx mode...
So far, I did some quick tests, and some detailed visual. The runs where the big cap was that got smooged tested all fine end to end. Tantalums tested no shorts. Finals seem odd. Need to lift 2 sides in order to properly test them. This is going to be a detailed circuit trace job. Hope its...
I got into it this morning. Looks like someone changed the big cap and cleaned up that part of the board. I do see other leaky caps. Will change them out shortly. I also see a few tantalums that like to short out and take parts with them. I didnt know that they hadca mobile version ofvthis...
I replaced all of them. Unless some are hidden, I got them all. I pretest all the new ones and test the pulls. All the pulls tested within spec then of course tossed. I replaced a few resistors that had signs of overheating. Some values were off. Main plate voltages all tested good. I might be...
Man I appreciate all that insight and manual info. I sure do hope that my VCO block isnt the final problem. I have the board loose and im going to start working on this one soon. I just finished my mk3 set and started on my demco set. Nothing weighs more than flipping a dak x over for repair...
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