Strange Celestron AVX Problem Last Night
Posted 07 July 2013 - 11:05 AM
It was probably 45 degrees off pointing to Arcturus. Same or worse for other stars. This is my first EQ mount so I thought I must be doing something wrong. I double and triple checked that the RA axis was pointing north. I double checked axis balances. Double checked the location info in Utilities etc., and still pointing was way off. I even checked to see if there were alignment or calibration stars still in memory from the previous night.
Out of desperation I reset the mount to factory settings and started over. That did the trick and I had another night of a really good ASPA and guiding.
Has anyone else had this issue with the AVX or other go-to EQ mount? It's a head scratcher for this EQ mount noob.
Posted 07 July 2013 - 11:39 AM
In fact, when I was reading the first few sentences, I was thinking to myself, "sounds like it needs a factory reset".
Posted 07 July 2013 - 11:44 AM
Posted 07 July 2013 - 11:46 AM
Posted 13 August 2013 - 01:40 PM
Posted 13 August 2013 - 01:56 PM
Posted 13 August 2013 - 03:48 PM
How are you powering the mount? This can be caused by low voltage. Voltages lower than 12.3 has caused problems on Celestron mounts in the past.
Well, I was using a just charged car charger battery pack. I think that the voltage was good, I have not charged the pack since then, and I used it after the factory reset fixed the problem... let me look... 12.9 V under load from the scope (it has a built in meter), so I think that the voltage was OK, and obviously no line noise on a DC battery. Also the alignment failed (about) 8 times in the same way, then everything was OK once I reset using the same power source. One further strange clue, during one of the alignment attempts, I went through with the entire alignment with 2 stars, slewing all over to center them. Afterwards I checked the polar error, and it was off by almost nothing in altitude but 27 degrees in azimuth, even though I could see Polaris through the polar scope opening. After the reset, everything went perfectly, the initial slew was very close, and after alignment the gotos were at the center of my 12.5mm eyepiece as usual. I'm really impressed with this mount overall, just mentioning this weird one time problem.
Posted 13 August 2013 - 03:56 PM