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Re: QMX Fail on power up


 

Did D108 also fail?

JZ

On Tue, Aug 1, 2023, 2:57 AM Daniel Walter via <nm3a=[email protected]> wrote:
Built 2nd QMX. Initial continuity checks good. Powered with current limited supply- no current at first. Left encoder push gave 155 mA steady draw. Powered down.

I made the bad assumption that all was well. (I did not follow my own advice.) My next power up was with my usual 12V battery supply. Left coder push, loaded 005 firmware. This appeared to go well, but QMX did not reboot and turn on LCD light.

I sequenced power but no response to left encoder push. A second or two later C107 and Q108 self destructed. No obvious damage elsewhere, but something must have drawn high current with 5V p/s turn on.

All boards were in place when this happened.

Any ideas where to start?

Dan
de NM3A at mail dot com




--
73, Dan? NM3A





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