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My scale is currently being a pain in the ass. I hold down the cal button for a wile with nothing happening. and the scale its self seams not to be working.
I have the Lyman 1220 DPS and had a problem with the scale not wanting to zero, turned out to be a few kernels of powder under the pan, blew them out with some canned air and it worked fine after that.
Also keep in mind how sensitive these machines are. My loading bench is right under a air register in my basement. Every time my furnace came on I couldn't get the hooker to zero. Once I figured it out and plugged the vent it was fail free.