Re: My AP1100 CP4 died (I think ..., need confirmation)

Cheng-Yang Tan

You mean this board that I put a rectangle around it?

On Sunday, May 30, 2021, 03:37:01 PM CDT, Marj Christen <marj@...> wrote:

Hi Steve,


One other thing to try. Open the cover of your CP4 and push down on the small circuit board to reseat the connections. It is possible that it came loose from the main board. It is highly unusual for a CP4 to simply die. Let us know if that works for you.


Clear Skies,

Marj Christen


11250 Forest Hills Road

Machesney Park, IL 61115

Phone: 815-282-1513


From: <> On Behalf Of Steve Salvo
Sent: Sunday, May 30, 2021 1:15 PM
Subject: Re: [ap-gto] My AP1100 CP4 died (I think ..., need confirmation)


Yes, initially it lite red.  As soon as I directed east, the yellow light immediately went on and the mount would not move in the east direction. After restarting, the mount would move west, but not east.  Directing east caused the light to turn yellow and motor stall.



On May 30, 2021, at 14:09, Cheng-Yang Tan via <cytan299@...> wrote:

Do you remember whether your CP4 LED lit up?


Anyway, it was a very weird night. After powering up, with the CP4 LED lit up, I wasn't able to talk to the CP4 with USB. I changed USB cables and used my backup laptop and both wasn't able to talk to the CP4. But I was able to talk to it via TCPIP. In APCC, I can move the mount in RA but not DEC. That's when the stall error popped up.


After taking it back indoors, the CP4 LED no longer lights up :(






On Sunday, May 30, 2021, 01:04:04 PM CDT, Steve Salvo via <sws105@...> wrote:



My CP4 was showing similar issues.  Turned out to be mount limit warnings.

see below from Rolando.

 Roland Christen




'm afraid to repeat these tests as there could be potential problems with the hardware, 

The "Motor Stall" warning will occur when unsafe limits are exceeded. This is not a warning that something is wrong with the motor or electronics, it is simply telling you that the software has turned off the power to the motors to prevent your scope from being damaged. At this time we use the same error code for all situations where the motor power has been turned off. It probably could be changed to indicate not "motor stall" but "motor power deactivated".  However, we have many other software challenges right now and this one will have to wait a bit. Be assured that nothing bad has happened to your electronics or the motors.




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