?

Hi, I have owned a Classic 20" f/4 Obsession with Argo Navis and ServoCat since 2020 an have not encountered any problems until recently.? Now after 2 star alignment, selecting an object, and pressing GOTO on the hand controller the scope slews first in the azimuth direction normally, but when it tries to slew in altitude it gets part of the way there then stops short of the object.? If I press GOTO it resumes movement in altitude but again stops short.? If I repeat the GOTO command several times it eventually reaches the object and I hear the beep beep sound.? In daylight I can perform jogs in the altitude direction without any problem, the altitude cable is not slipping when engaged and the motor running and the mirror box is well positioned and not obviously encountering excessive friction. The scope is reasonably well balanced.? I did clean the teflon strips on which the mirror box rotates with soapy water a while ago, but the problem is more recent then that. I use mains power via an AC-DC converter (12v, 3A) and have never had a problem with this.? When jogging the drawn current reaches about 1A.

Does anyone have any suggestions as to what the problem might be, please?

Regards, Mike Greenhill-Hooper