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C. RA Encoder
1.) Remove the RA Encoder Cover Plate found on the
drive base by unscrewing the two screws that hold it in
place.
2.) Using the 1/8 Allen wrench, remove the center bolt
from the polar housing and discard. Be sure to leave
the remaining large bent washer in place.
3.) Take the 10-32x314 button head screw and slip
first the #10 Washer', then the RA gear, and then the
RA gear spacer onto the screw. Make certain that the
shoulder of the RA gear spacer fits into the hole of the
RA gear. Insert the screw assembly into the polar
housing and tighten firmly.
4.) Position the holes of the RA Encoder Assembly
mount bracket over the tapped holes on the recessed
ledge oriented such that the encoder cable can easily
exit through the notch in the polar housing and attach
with two 4-40x114 screws (see diagram below).
5.) Adjust the position of the gear on the RA Encoder
Assembly to match the height of the RA Gear, then
tighten its two set screws with the .050 Allen wrench.
8.) Next, adjust the RA Encoder Assembly by
rotating it through the slotted hole of the bracket until
the gears mesh smoothly
7.) Place the RA Encoder Cover Plate back over the
polar housing and re-attach the two screws that hold it
in place.
Version 05-96-l
D. Connecting to Magellan
1.) Coming down the inside of the left fork arm is the
encoder cable. Plug its 8-pin phone connector into the
socket near the base on the inside of the fork arm and
tuck the black shrink wrapped electronics board inside
the fork arm.
2.) Connect the 8-pin DEC Coil Cord into the plug on
the LX50 power panel labeled 'Encoders". Plug the
other end if this cord into the socket label
"ENCODERS" on the left fork arm.
3.) Plug one end of the Handbox Coil Cord into the
Magellan II Handbox, and plug the other end into the
4-pin phone socket labeled "Handbox" on the Magellan
I I power panel.
F. Troubleshooting
If the encoder display of the hand box shows no
change when the telescope orientation is moved,
check the following.
1). Make sure the batteries are fresh and connected
properly.
2.) Check the connections of all the cables. Loose
wires will inhibit performance.
3.) Tighten the set screws on the DEC Encoder Ring
Gear and the gear of the RA Encoder Assembly. Be
certain that any telescope movement turns the
encoder shafts.
4.) Firmly tighten the 10-32x3/4 center bolt in the
polar housing.
Part number 14-0254-00
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