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F1 and not working

johnlyons
Tue, 14 Nov 2017 23:41:01 GMT

I'm getting the F1 error. Here's what I get. Power on, power off. Check. When powered up I get 15 on the readout, no points (as in .15) Clipping the leads together I get 00 without zeroing the meter and the first point lights up. I zero the meter with clipped leads then clip in the test resistors while turning the upper trimmer (200 ohm trimmer) with no change. Readout stays at 00. If I press and hold down the button I get F1. I have measured, placed and oriented the components correctly as well as checked for solder bridges and broken traces with a loupe and strong front and backlight. I build PCBs all the time, I'm kind of at a loss for where to go from here. Any ideas? Thank you. John

Bob Parker
Wed, 15 Nov 2017 02:03:48 GMT

Hi from Down Under, John. Sorry you're having trouble with your meter. Do you have a reasonable digital camera of some kind? If you could take sharp photos of the front and back of the board and send them to me at [email protected] I might spot something which you've missed. If you can't send me pictures, do you have an oscilloscope we can do some measurements with? Thanks.