CGE surgical proceedures...
Posted 15 July 2009 - 04:03 PM
So today I am going into the guts on the heads and may very well make the modifications to the cable connex I've been considering, anything to avoid yet another night ruined by this mount (and it's still not a year old).
Posted 15 July 2009 - 04:11 PM
I had to adjust the micro-switch on mine once to get it to find the home position. I wouldn't make any mods until the warranty is up.
Posted 15 July 2009 - 07:43 PM
I did the updates as soon s they came out, and continue to wonder if (having a clear view of Polaris) I should... not trying to start a debate on that - but I think they've done a great job either way...
The horrible thing last night was that I finally had started taking test exposure of the Dumbell (no - not me, the M object...) and was going Wow! great! cool! and had to do a meridian flip before going for the real shots... well it didn't survive the flip, ended up pointing more towards the Eagle and thats not even close....
Ok. I've got all the stuff out of the 'pier' and have covers of RA and DEC assys... the works is on the table and have meters, soldering equip, spare wire and cabling at the ready...
Am inpressed at how modular and easy this all is to fool with
Posted 15 July 2009 - 09:09 PM
Posted 16 July 2009 - 03:49 AM
Well that's what I do also, I think it works amazingly well, "when it works" but this thing has just gone sort of what an old tech friend of mine would call 'catywompus'... As I said, last night before the meltdown it had M27 'center chip'.
I have the RA assy working reliably now after several hours of playing with the switches and thought the dec was working too... the find switches routine was working just fine... went 3 or 4 times on he test bech no problem... until I tried to do an actual 2*4 alignment about 2 hours ago... started ok, then again the dec started 'swirling'... then seems ok, then looking for stars below my patio I suppose the inital estimates on the align stars weren't up to par either, but it seemed to take the slew/correction well enough.
Interestingly, all the switches check out though both a Fluke and analog VOM's... when it's (now the dec only) doing the 'whirl-o-matic' bit I had it removed from the cam assy and was manually actuating it and 'nada'... Certainly the cabling is suspect, but I've 4 or 5 sets and problems seem to change a little, but they arent fixing it this time.
I've let it suck the life and fun out of this hobby enough for one day, oops, make that 2 days (and nights....) will try again tomorrow. I've had problems with mount a-plenty and from what I hear about C's after sales suppor I am not chomping at the bit to send it to them and after 2 months hear again that I dont know how to plug cables in.
Posted 16 July 2009 - 06:51 AM
Posted 16 July 2009 - 05:45 PM
Well there is some progress... the main input 12vdc to both male and female portions were 'less than good', I know I'd slight jacked the pin once or twice but the plug always seemed to fit. Ohm/voltage checking reveals problems on both sides!?!?! Well one of many things done today was to replace the power conx from both sides w/ some HD teflon 4-pin jobbys...
Too much to type... and gotta run... but I think the input power may be why symptoms seemed to move around?
Lots more testing to go through... Oh and one last thig, don't know if this is normal but the MC interconnect / interface board was just loose in the pier, it has standoffs, I see screw holes on the upper and lower tube plates, assuming it must go on one as both have holes at correct spacing...
Posted 16 July 2009 - 10:00 PM
But still it seems that the interconnect cable seating is a problem...I'd like to remove the jack from the board and stress the spring wires more 'out' to try and better contact...
Looks like another great night here... we'll see if I got it?
Posted 18 July 2009 - 06:30 AM
Knew right away when slew after slew on the initial 2*4 align was getting them into the reticle ep field of view... whew! I thought... then the polar aling on Nunki... then the realign 2by 4 and a quick slew to M57 and "yeah Baby!" it's dead center - turned off the illum in the reticle ep and it was actually behind the double crosshairs... Wahooo! Miller Time..
Then i thought... well let's shut it down and wait half an hour and do it all over... just to be sure. And again (only a bit better having PA'd previously) they all showed up just fine re-pa'd re 2 by 4'd and spent some time looking at Jup (it slewed dead center) before slapping the imager on the thing and 'snapping away' on the ring and the dumbell.
This is the CGE that wowd me when I got it! I am happy... sorta...
I should predicate all this acivity with the fact that although the CSC and our local weather say 'clear' there is a patchy high overcast that made some things a bit more difficult than easy... but bottom line "It's Back"...
Posted 18 July 2009 - 07:35 AM
Posted 18 July 2009 - 02:48 PM
I'll be posting some pics of the mods - I need to see what I took picks of in the melee.
Posted 18 July 2009 - 02:55 PM
As far as the GOTO and slew issues, I'm feeling the mount is 'back to normal' and I am pretty darn happy and seems the slews and tracking are indeed back to what I expect from this mount.
Posted 18 July 2009 - 08:55 PM
The resistive test is done without power and manually actuating the switch.
On the DEC head assy it is easier to do if you remove the dovetail mounting plate from the dec head, I think they are 3/8 allen head?
Posted 18 July 2009 - 09:03 PM
Posted 18 July 2009 - 09:13 PM
This was done on the corresponding connector on the control interconnect board in the electronics pier. That board can be removed easily by removing all at the same time. Altogether there are 4 connectors to mod. Using different color wirring pairs help make it easy to keep from cross wiring the grounds. BE AWARE on all these solder jobs that you dont solder to the metal housing too close to the 'exposed face' as these are a tight fit when installed in place and you risk creating another short or ground path... leave at least 1/4 "... and as a safety cover with electrical tape when done before re-installing the board.
Another thing to note, on the electronics pier (outside) these connections are labelled RA and DEC.... on the board the are labelled ALT and AZ...
Posted 18 July 2009 - 09:29 PM
Posted 18 July 2009 - 09:33 PM
Posted 18 July 2009 - 09:35 PM
Posted 18 July 2009 - 09:51 PM
put all small screws in cups or an empty egg container to keep from losing...
use electrical tape and label all connectors clearly BEFORE you disconnect them...
have a sheet of paper to note work activity and progress
use rosin core solder, makes the job of soldering the copper wire to the tin? metal connector housing a breeze.
observe all standard safety practices with electricity and hot soldering iron
If in doubt keep wire lengths much longer than you think you need - it's always easy to take more off than 'MORE-ON'
DISCLAIMER This will certainly invalidate any warranty on the mount. If you are handy with electronics it's really a breeze. If not, get a friend who is to help get it done?
If curious about the power mod please PM me.