ASTRO-PHYSICS 1200 Manuel - Page 11

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INSTALLATION OF ENCODERS AND ENCODER HOUSINGS – 1200 MOUNT

PART LIST

Right Ascension (R.A.) Encoder housing (black anodized)

Declination (Dec.) Encoder housing (black anodized)

R.A. Axis Adapter (clear anodized – silver colored), labeled R.A.

Dec Axis Adapter (clear anodized – silver colored), labeled Dec.

To install your encoders, first remove the telescope from your mount. Remove your declination counter weight(s) and

declination counterweight shaft.

FITTING DECLINATION ENCODER HOUSING

If the encoders were purchased with the 1200 mount, it is likely that the declination axis adapter and encoder housing

have already been installed. No further action will be required, as this encoder will remain in place.

1. If the encoders were purchased separately, the silver-colored Dec. axis adapter may be inside the black Dec. axis

encoder housing. If it is, remove it now.

2. Locate the counterweight shaft adapter (the black anodized part that the counterweight threads into) on the Dec. axis.

When we assembled the mounts, we threaded this on rather tightly, so you will need some extra leverage to remove

it. Locate the hole that was drilled into the part and find some object that you can insert. We suggest that you use

one of your allen head wrenches that is wrapped in masking tape so that you do not mar the finish of the part. Since

you may need to apply a good deal of force, it may be easiest to do if the mount is on the pier so that it won't move.

3. Thread the Dec. axis adapter into the end of your Dec. axis. Final tightening should be done with firm hand pressure.

Normally the Dec. axis adapter will not be removed.

4. If you look into the black encoder housing, you will see the encoder itself mounted at the rear of the housing. When

this installation procedure is complete, the encoder shaft will insert into the center hole of the Dec. axis adapter. This

allows the encoder to read the motion of the declination shaft as the declination axis moves.

5. Thread the Dec. encoder housing onto the Dec. axis housing of the 1200 mount. You may need to wiggle the

encoder housing

gently to engage the

shaft of the encoder

with the hole in the

center of the Dec.

axis adapter. When

the threading is

complete, tighten up

with firm hand

pressure (or insert

your special "tool"

from above and

tighten firmly) since

normally this

encoder housing will

not be removed.

6. The counterweight

shaft may now be

rethreaded into the

rear of the Dec.

encoder housing.

1200ENC (purchased separately)

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