We have a small manufactory for measuring properties of oil. A lot of time I succesfully use DAC8750 for generate 4-20mA channel of my electronics. Unfortunately now I often (during two years) meet a trouble OUT port of this converter. It doesn't works and I'm watching 100mA (or sometimes 0) in Iout (rather it shows my amphermeter (Metra hit 30M), and it has a verification certificate, correctly work), in this time power supply don't show the same (it show approximately 0 mA). I decide this problem just replacing to new converter. Can you suggest a way to solve this problem?
I attached an image of the schematic and the layout.
Notice: we use varnishing to protect printed circuit boards.
