Last updated: 20 November 2007
Subject: etx125 Sent: Monday, November 19, 2007 00:34:37 From: mjb mjb (email@example.com) Without putting too finer a point on it, I have wound the collimation screws out too far and the mirror is now loose inside the tube. What next please ??Mike here: From our resident hardware expert, Dr. Clay Sherrod:
From: P. Clay Sherrod (firstname.lastname@example.org) Wow....you have made so much adjustments that you have disengaged the mirror? If this is the case, then there is absolutely nothing that YOU should attempt; it needs to go in for repairs. For those who have never attempted collimation on any closed tube MAK which must be dismounted from the mount to collimate, simple words: DO NOT. To attempt to do so will always lead to even worse collimation or serious troubles as we have here. Sorry for this, but you should have written sooner for some collimation advise OR consulted the articles posted on Mike Weasner's website about the does and don'ts of collimation of these telescopes. Dr. Clay ------------- Arkansas Sky Observatories Harvard MPC/ H43 (Conway) Harvard MPC/ H41 (Petit Jean Mountain) Harvard MPC/ H45 (Petit Jean Mtn. South) http://www.arksky.org/
thank you for your timely advice. Unfortunately I live on an Island in the South Pacific that doesn't have a repair service and to send it back to the States would cost more in freight than the scope cost me..used. It's either throw it out or let it lie...or try to fix myself. Such things are not unknown... Thanks
You can access the main mirror and behind it (so that you can re-engage the three alignment screws) by first taking out the THREE small cap head screws that are embedded in the holes found on the plastic rear cell of the OTA; take those out completely. Once out, take off the focus knob. Then pull the OTA out the FRONT of the fork arms....it will be tight, but it will come out easily once it breaks free. Once out, then unscrew the entire BLUE aluminum tubing from the very rear steel metal cell. This will expose the mirror, the mirror adjustment screws and everything that you need to reconnect. Best of luck. It is fairly easy, but go slow. Dr. Clay
Go back to the Tech Tips page.
Go back to the ETX Home Page.