I have a Celestron NexStar NX SLT go-to computerized mount. one of the arms that stabilize the leg and support the accessory tray broke

Is there a calibration process?

This is said by Celestron to cover the 4GT with minor differences
http://www.tasco.com/products/manuals/Tasco56TN-57TN-301051N-301004N-301005N.pdf

There are also some firmware upgrades available on the Celestron website
http://www.celestron.com/astronomy/celestron-nexstar-4gt-computerized-telescope.html

A nice little scope. Manuals from here

http://www.nexstarsite.com/Manuals.htm

or here

http://www.celestron.com/astronomy/celestron-nexstar-102slt.html

Scroll down and select the Support Tab

Either contact Celestron directly-- or look here--

http://www.telescope.com/control/accessories/telescope-focusers

Basically, enter Time, Date, and Site-- level the tripod and do a 2 or 3 star alignment.

All of the manuals are on the Celestron web site here--

http://www.celestron.com/c3/downloads.php

Check with moonlite.com for a really good focuser, and what they fit.

You can only get these new from Celestron:
http://www.celestron.com/c3/page.php?PageID=37

You can also find these advertised on craigslist.com from time to time.

200$

Go to KMart and by the Daisy BB gun sight, same thing for $14. Get a copy of The NexStar User's Guide by Michael Swanson. Best $20 buck accessory you can find.
HTH, Geo.

A low voltage power supply is the usual cause. You must use fresh batteries and or a seperate 12 volt power pack.

Also you must accurately;y do all the setup-- like Time, Date, and Site properly. Read the setup in the manual again.



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