So I have a stand-alone Mata Hari headboard that is used for testing purposes.

I previously had a Alltek Ultimate Solenoid Driver Board (USDB) in it that was powering an Alltek MPU board.  That USDB was pulled because it was needed for another purpose and I later received a new USDB as a replacement.  However, after connecting this one up it only lit up its +43 VDC LED. (Actually, it also lit up its 180 VDC LED, but that has nothing to do with this post.)

Continue reading Alltek Ultimate Solenoid Driver Board with only the +43 VDC LED lit →