CG5 declination motor just stopped working!
Posted 22 August 2012 - 12:05 AM
I proceeded to take all the plastic covers off the mount to perform more test before I started swapping out parts. I checked to make sure the RA motor still worked fine, which it did. I then disconnected the RA motor's wire connector from the Motor Control Board (MCB)and attached the DEC motor's wire connector in its place. Pressing the slew buttons on the hand control, I still could not get the DEC motor to operate. Connected the RA motor back up to the MCB, and it worked fine again. So, this is definitely making me lean more toward it being an issue with the DEC motor than with any of the control or power boards.
However, before I resort to ordering a new DEC motor, I want to replace the DEC port and Power Board with the new ones I bought, just to be sure. So, I swapped out those parts and hooked everything back up. Still, the DEC motor would not turn.
I then decided to start fiddling with all the wires to see if it was a damaged wire. While continuously holding down the North slew button, I started jiggling all the wire connections and bending all the wires. Nothing happened. Then I unplugged the encoder wire connector from the bottom of the DEC motor and plugged it back in. Suddenly, I got a very brief but very fast slew from the DEC motor. And then I got the "No Response 17" error on the Hand Control.
I powered the mount off and back on again to clear the error message. Tried slewing the DEC motor again and the same thing happened. Very fast but short movement from the DEC motor followed by the "No Response 17" message. I powered off/on my mount again, and this time I removed the cap from the encoder wheel on the bottom of the DEC motor. After removing the cap, I was able to continuously slew the DEC motor.
However, something was definitely wrong with it. The slew rate was exceptionally fast. Much faster than I'd ever seen it before, and the motor was extremely loud. I tried adjusting the slew rate from 9 down to 5, but the DEC motor still moved at the same ultra-fast speed regardless of what slew rate I set. The RA motor operated at the correct speed for whatever slew rate I set, but the DEC motor stayed in afterburner mode. Not only that, but the DEC motor wouldn't stop immediately after I let go of the slew button. It would continue to slew for 2-3 seconds before finally stopping.
I put the cap back on the encoder wheel and kept fiddling with its wire connection to see if that was the culprit. Unfortunately, messing with the wires didn't seem to affect anything. After running the DEC motor in this super fast rate for a bit, it started throwing up the "No Response 17" error again. I could press "UNDO" to clear the error, but then the DEC motor wouldn't work anymore. The RA motor still worked perfectly fine this entire time. After power cycling the mount again, the DEC motor is now giving the "No Response 17" error pretty much every time and is only operating in the super-fast slew rate intermittently (maybe once in every 3-4 tries after power cycling).
After messing with this for about 1.5 hours, I gave up. I cleaned up all my parts and put my mount back together. I resolved to simply order a new DEC motor as everything I tested out seems to point to it being the problem.
I placed my order with Celestron tonight and will patiently (or not) await its delivery. I can only hope that the new DEC motor will finally clear away all my problems, and I can have a properly working CG5 mount again.
Keeping my fingers crossed!
Posted 22 August 2012 - 02:35 AM
Posted 22 August 2012 - 12:58 PM
Posted 28 August 2012 - 10:30 PM
Turns out there is one small problem though. When I was disassembling my scope and moving everything out of my kitchen, I found my power supply to be leaking an unknown liquid. Closer inspection revealed it to be sulfuric acid leaking out of the battery. Yeesh! Another part needing replacement!
Posted 31 August 2012 - 05:49 PM
UPS says replacement parts should be delivered this coming Tuesday. So, now my question is: does ordering mundane, internal repair parts invoke the astronomy curse? I would hope not. It's not like this is some new EP or other astro toy that I'm really excited to get. I'm just trying to fix my broken mount!
Ordering the parts doesn't. Getting the mount fixed an working does.
I apologize to everyone for fixing my mount and replacing the battery in my power supply. I had no idea it would result in Issac socking us in for the whole weekend!
Posted 24 October 2012 - 07:49 PM
Posted 24 October 2012 - 09:51 PM
Posted 25 October 2012 - 07:24 AM
Posted 25 October 2012 - 07:30 AM
Posted 25 October 2012 - 07:31 AM
Posted 25 October 2012 - 07:44 AM
Posted 25 October 2012 - 08:02 AM
Posted 25 October 2012 - 11:36 AM
I don't see anything on the circuit board that looks burned. How obvious should it be? One thing I noticed is that some of the wires have a slight yellow discoloration to them. However, again, I'm showing that they are still working with the continuity test. Maybe I'm doing something wrong?
Posted 25 October 2012 - 01:52 PM
Posted 26 October 2012 - 09:05 AM
Posted 27 October 2012 - 10:04 AM
Posted 05 November 2012 - 03:19 PM
Posted 05 November 2012 - 03:55 PM
Posted 06 November 2012 - 11:53 AM
Posted 06 November 2012 - 12:18 PM
Posted 19 November 2012 - 05:10 PM
Also, how do I tell how loose the dec axis should be?