2 replies to this topic

[Plinthley]

New owner of GM-100 S/N 0082, which used to be owned by a guy who was a member here.

Here's my problem: The RA motor works, and I can see the worm gear turn either direction, but the setting circle never moves.

The Dec motor worked last week, and I could see the belt move. Now it makes a clicky sound but the belt does not move.

The 492 unit appears to be in solid working order. I have a couple other 492s, so I could swap one out and see if that makes a difference.

The clutches work smooth and easy with no slop.

What should I check out next?

[macdonjh]

For your RA setting circle, look for aset screw, probably 1/16", and loosen that. Once you've found your object, fine tuned your setting circle and started tracking it's not supposed to move.

I think your idea of switching the motor cables is a goid way to diagnose your Dec motor. If it still doesn't work the problem is with the motor or gear box.

I just contacted Losmandy: they have stepper motors available for $185.

[Plinthley]

For your RA setting circle, look for aset screw, probably 1/16", and loosen that. Once you've found your object, fine tuned your setting circle and started tracking it's not supposed to move.

I think your idea of switching the motor cables is a goid way to diagnose your Dec motor. If it still doesn't work the problem is with the motor or gear box.

I just contacted Losmandy: they have stepper motors available for $185.

Good to know, thanks!