ASTRO-PHYSICS 1200 Manual - Page 12

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FITTING RIGHT ASCENSION ENCODER HOUSING

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

have already been installed. Please continue to read these directions since you may need to remove and reinstall the

encoders if you use a polar alignment scope. Since the polar axis telescope and R.A. axis adapter thread into the same

location, you will need to switch back and forth between them as needed. If you use the JMI NGC MAX or Mini Max

Digital Setting Circles, you can use the "polar align" mode in these units instead of a polar alignment scope.

1. If the encoders were purchased separately, the silver-colored R.A. axis adapter may be inside the R.A. axis encoder

housing. If it is, remove it now.

2. Thread the R.A. axis adapter into the end of your R.A. axis. If your polar alignment scope is fitted you must remove

this first along with the polar alignment scope adapter. Use moderate hand pressure to tighten the R.A. adapter since

you may need to remove it to install the polar axis telescope at a later time.

3. 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 R.A. axis adapter.

This allows the encoder to

read the motion of the R.A.

shaft as the right ascension

axis moves.

4. Now thread the R.A. encoder

housing onto the R.A. axis

housing. You may need to

wiggle the encoder housing

gently to engage the shaft of

the encoder (located within

the R.A. axis housing) with

the hole in the center of the

R.A. axis adapter. Again,

use moderate hand pressure

as you may wish to remove

that at some time.

5. The hardware for your encoders is now installed. For actual set-up procedures for Micro MAX, Mini MAX or NGC

MAX, digital readouts refer to the relevant operating manual from the manufacturer. We provide some startup tips in

our instruction sheet entitled "Using JMI Setting Circles".

PERIODIC MAINTENANCE

If you remove the R.A. encoder frequently, you may wish to use a very tiny amount of auto grease on the mating threads.

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