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Video Blog #001 - Repair of Mastech MS7221 Volt/mA Calibrator

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DISCLAIMER: This repair video is educational only, so if you decide to do the same yourself then you are on your own, I can't be held responsible for any problems/issues/damage/injury that may occur if you decide to follow this blog and try it yourself.


Repair of a Mastech MS7221 Volt/mA Voltage Current Calibrator (Source/Output Step DC 0-10V 0-24mA Tester Meter).

I purchased the MS7221 off Ebay as condition unknown/possibly faulty. I took a chance and bought it as these units are very useful for simulating 0-10vdc & 4-20mA signals. No instrument tech should be without one.





Far from complete but shows the basics of the on/off button and psu front end.


# Ame 2014-03-01 08:06
Thank you man that was really helpful
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# Miriam 2015-03-04 12:41
Hiya any chance you could tell me what component U14 is? It is blown on my calibrator and I can read the text off the component.

I would be really grateful.

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