Thursday, August 16, 2012


I just went out to observe the occultation of Venus by the Moon and discovered that the mount on my CPC1100 has died again.  It was working fine when I last used it on July 18.  I put into Hibernate mode at the end of that session.

Today when I turned it on, I got this message on the hand controller:


I pressed UNDO, and started a Solar System Align on the Sun.  The GPS was working OK.  I got the warning about the Sun, pressed Enter to rid of it, and then pressed the direction pad.  This got me nothing except a message:


I repeated this with the controller from my NexStar 6, with exactly the same results, so the problem is in the mount.  Not the same as last time, because I never saw any error messages before.

We've had a couple of thunderstorms, but no close strikes, and the scope is now on a surge protected power bar.

I've found this file, which has some helpful information:

I dread having to update the firmware.  The last time I did this, it wiped out all 99 of my User Objects, my entire library of variable stars.  I had to re-enter them manually, something I would rather not do again, if I can help it.


Earlier today I set up the Celestron CGEM mount on the concrete pad on the east side of the house: maybe this put a curse on the CPC!


  1. Hi Geoff,

    Have you tried plugging the hand controller into one of the two AUX ports on the base? When I got a 16 error while I was plugged into the arm port, I switched off and tried the AUX ports and have not had any problems down there... but I guess it's just a matter of time!

    1. Thanks for the tip. I felt so discouraged after the CPC failed so soon after I had just gotten it running again that I haven't tried troubleshooting it yet. I'll give this a try.