Meade Instruments Corporation
16542 MILLIKAN AVENUE, IRVINE, CALIFORNIA 92714-5032 USA (714) 756-2291
FAX: (714) 756-1450, (714) 756-1504
LX50 - Magellan II
I. LX50 Encoder Installation
A. Components
.050 Allen wrench (1)
1/16 Allen wrench
(1)
1/8 Allen wrench (1)
4-40x1/4 button head screws
4-40x5/8 button head screws (2)
10-32x3/4 button head screw
(1)
#10 Washer
Cylindrical Stand-off
(2)
RA Encoder Assembly (w/cabling) (1)
RA Gear (144 tooth, Alum.) (1)
RA Gear Shoulder Spacer
(1)
DEC Encoder Ring Gear
DEC Encoder Assembly (1)
DEC Coil Cord
Handbox Coil Cord (1)
Magellan II Handbox
(1)
B. DEC Encoder
1.) Remove the declination setting circle, beauty
cover, and setting circle spacer, indicated by ‘A’ in the
diagram below, from the left fork arm by unscrewing
the declination knob. The left fork arm has a socket
labeled “ENCODERS” near its base.
2.) Using the 1/16 Allen wrench, unscrew the four
button head screws of declination cover plate and
remove the plate.
3.) Slip the end of the cable of the RA Encoder
Assembly with the Spin connector through the back
side of the rectangular opening in the declination
housing. Cut the tie strap on this cable only if you are
installing on the 10” telescope .
4.) Plug the S-pin connector to the base of the
encoder on the
DEC Encoder Assembly.
NOTE:
Be sure the connector fits over all the exposed
pins and that the wires from the connector are oriented
away from the bracket.
5.) Inside the declination housing, there are two pads
with tapped holes on either side of the rectangular
opening. If these pads are only
about
1/8” high, it will
be necessary to use the
two Cylindrical Stand-offs
and the
4-40x5/8 button head screws
when mounting
the
DEC Encoder Assembly.
Otherwise, discard the
Cylindrical Stand-offs
and use the 4-40x1/4
button
head screws.
6.) Position the holes of the DEC Encoder mount
bracket over the tapped holes of the two pads and
attach with two 4-40 screws. Note that one of the
holes in the bracket is slotted.
7.) Slide the DEC Encoder Ring Gear over the
setting circle spacer indicated by ‘A’ in the drawing.
8.) Slip the stud of the declination knob through the
spacer/ring gear. To ensure a snug fit, wrap some tape
around the stud. Screw this assembly completely into
the DEC housing.
9.) Adjust the position of the DEC Encoder Ring
Gear
to match the gear of the encoder assembly, then
tighten its two set screws with the 1/16 Allen wrench.
10.) Next, adjust the DEC Encoder Assembly by
rotating it through the slotted hole of the bracket until
the gears mesh smoothly.
11.) Remove the declination knob. Slip the stud of the
declination knob first through the beauty cover, then
the setting circle, and then the setting circle spacer
(with the DEC Encoder Ring Gear firmly locked in
place). Thread the stud into the DEC housing.
Remember to align the setting circle before tightening
firmly.
12.) Replace the declination cover plate.
