<\/div>\n

I’ve had a lot of problems with my Dual Field units not tuning at preset Delay. \u00a0There will be a strange, smooth overtone “hum” instead of the usual sharp crackle and no targets will respond to the coil. With this fault the machine needs to be turned up to almost one quarter before the normal t\/h is heard. \u00a0This is not the board or coil, but a simple moisture problem. \u00a0The solution was taught to me by Bill Lahr–the SMPI circuit’s developer. \u00a0Bill suggests setting the opened unit in front of a medium heat hair dryer for 10 minutes on, 10 minutes off. \u00a0As you complete a few cycles you will see the proper \u00a0t\/h coming in lower–closer to the preset. \u00a0To open the unit, sit in on the ground and step on the batteries with your dominate side foot. \u00a0Then \u00a0crimp the plastic spring with pliers–being careful not to pinch the board. \u00a0Then get a flat screwdriver in the gap at the end and pop the cover panel off. \u00a0Do the same thing with the actual board–being careful not to break the corner off. \u00a0Then stand the board up and gently slide it into the end of the compartment–so that it sets in an “L” configuration. \u00a0The unit can now be stood on it’s side. \u00a0(It’s best to remove the cells so you don’t short anything with the side clips). \u00a0Stand the unit about a foot back–testing to make sure there is not too much heat even once the drier has heated up fully. \u00a0If this doesn’t work, make a cardboard partition to deflect the heat away from the board and focus the heat on just the pots array. \u00a0If you have some Deoxit give them s very short spritz. \u00a0Cheap contact cleaner is not a good idea as it will not dry completely. \u00a0This is how to restore a Dual Field with this frequent moisture related fault. \u00a0This same process is the way to dry out a flooded unit. \u00a0 It’s also the first thing to try with any Dual Field that’s acting up. \u00a0(After removing any salt water residue).<\/p>\n