I have a Meade DS-2090, which has proved impossible to align.
I have tracked to an issue with the telescopes Azimuth motor and/or encoder - it shows less than 360 degrees for one revolution actually 214 degrees, but its not consistent with that - when you return to the original position it does not show the start angle. The Altitude axis does not show issues.
I have done this on a lead acid battery at 12.58V, as I've read that some power supplies give noise that can cause encoder problems ( https://www.cloudyni...tor-unit-fault/ )
To show the Alt/Azm on the Autostar, I press mode for >3s and scroll down to the Alt/Azm readout
Azm Axis DS-2000 Azm readout
Start position 0h 0Deg00'00"
Half revolution 12h 106Deg42'02" (should be 180degrees)
Full revolution 24h/0h 214Deg15"51" (should be 360/0degrees)
moving back to original position opposite direction
12h 120Deg21'31" (should be 180degrees)
0h (original position) 027Deg27'13" (should be 0degrees)
I've calibrated the drives before the above trial.
I've had a go cleaning the Azm encoder lens using dental floss, before this, but a fuller strip to allow a cloth/alcohol to clean may help. Also swapped around the HBX lead for the other way around.
I've also read that there has been a history of noise on the motors affecting the encoders - this dates from maybe circa 2000 ( http://www.data-plum...om/dsmotors.htm ). This DS-2090 dates from a Costco sale circa 2010 - the firmware is the latest from 2007, and is the "Gen2" mount - silver outside on the arm, black on the inside. I purchased it them and struggled to use goto then. Life then happened, and its been stored until now when I have had time to fiddle!
Any ideas, suggestion including further debugging would be welcome.