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The next obvious guess would be resoldering the hand controller socket. Then start tracing the HC signals to look for something gone wrong. This would be easiest if you have a good board to do an A/B comparison.?

The fact that a bright star slew works makes it seem like a controller input problem rather than a motor/encoder problem. What happens if you initiate a dec movement through the driver or web interface?

??-Les

On Aug 8, 2021, at 7:24 AM, Michael Herman <mherman346@...> wrote:

?

Hi gang!

I received John's questionable G2 mini board, to test it out.??

Symptoms:

It boots up fine.

It slews to an Align Bright Star target fine.

If you press the RA diamond East West button it slews RA fine.

If you let it run Sidereal rate it tracks fine.

If you press the DEC diamond East West button, the DEC motor runs away!?

This is repeatable.

John got a new board from.the factory and his system is fixed...it is definitely a problem with this board, not the cables, motors or handset.??

I'm unsure what to do to try and repair this board...John did try to resolder his DEC socket.??

Any suggestions from the above clues?

Very best,

Michael

On Sun, Aug 8, 2021, 7:14 AM Brendan Smith <brenatlilydale@...> wrote:

Was the board repaired at Losmandy?? From experience a runaway flew is a bad motor socket solder join.?

The ICs used are mostly capable of ?minus 20C.? All ICs were chosen to suit this wide temp range spec. Very much doubt it’s that.?

Is I’d all good now ? Has it been repaired …if not….it’ll come back to bite when you least expect?
--
Brendan

Or H bridge.?

You can compare CRO signals at Ra+ on the PIC and H bridge against moving sidereal west at same points but Ra- pins. ?

As others have said. It’ll be the DSPIC or H bridge.?
--
Brendan