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Re: Motor stalled.......

 

If it is the U15 or U16 chip, then David Partridge in the UK has these or can make them.
I have not yet tackled that.? These chips are in sockets on the main board and can easily be?
pulled out (say with an automotive sharp hook tool) and replaced by the owner.

If it is the motor's encoder element, then, again, I have no experience with that trouble.??

In either case, I am surprised the prior owner did not experience the problem and that John, who?
just acquired the system, is stuck with this problem from his first experience.??

Best of luck,
Michael

On Sun, Oct 8, 2017 at 9:26 PM, brenatlilydale@... [Losmandy_users] <Losmandy_users@...> wrote:
?

John

Seen this before in DEC and RA, repaired a DEC one not long ago (hope its not same one doubt it)..? Unfortunately it's a bad DEC encoder IC.?? Yes there is a remote possibility its a DEC motor itself or DEC H bridge but I'm pretty sure its as I said.

Upon switch on both motor pinions lock...aka they are applied drive voltages on both sides of their H bridges.? Their pinions will have major resistance to movement and be difficult to turn (if you can and do it will log a boot fault in the HC).?? When you see the HC msg "system boot at xxxx....xx" the Ra pinion starts driving at sidereal rate., the DEC will stay locked resistant to movement and will only move if commanded.

On the system I repaired that had the same symptoms and bad DEC encoder IC (above), the DEC pinion was weak and rotated slowly? on pwr on and drove crazy if one of the HC DEC buttons was pressed.

Both Ra/DEC motor encoder ICs U15/16 are firmware installed.? Repairer: Rene? (Germany); David Partridge (UK); Michael Herman (USA); Me (Australia); Losmandy (USA)...anyone I miss?

Brendan




--
Michael Herman
mobile: 408 421-1239
email: mherman346@...
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