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demojohnny
journeyman


Reged: 11/26/12

Etx 105 not stopping at home position
      #5556900 - 12/06/12 05:14 AM

Hi, My Etx is just spinning it will not stopping anywhere so can't put in home position.

Firstly how easy a fix?
Secondly what is the best way to set it up so that it will align if I can't find the exact home position?
Thanks
Johnny


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Christopher EricksonModerator
Carpal Tunnel
*****

Reged: 05/08/06

Loc: Waikoloa Village, Hawaii
Re: Etx 105 not stopping at home position new [Re: demojohnny]
      #5556907 - 12/06/12 05:39 AM

Could be low batteries, bad power, bad cable or an Autostar/Audiostar hand controller that was swapped from another scope.

If it is a swapped hand controller, leave the clutch unlocked and after about 10 seconds or so, the motor will eventually stop and the Autostar/Audiostar will display a MOTOR FAULT error message. Hit ENTER and the scope should stop, do a short recalibration burst on each motor, the Autostar/Audiostar should then reboot and then all should be fine.

I hope this helps.


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demojohnny
journeyman


Reged: 11/26/12

Re: Etx 105 not stopping at home position new [Re: Christopher Erickson]
      #5557452 - 12/06/12 12:30 PM

Sorry not described this properly.

Before going to do an align with the clutch off the telescope I can manually spin the telescope through the 360 degrees and keep going. It never catches the at the home position.

Cheers


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Christopher EricksonModerator
Carpal Tunnel
*****

Reged: 05/08/06

Loc: Waikoloa Village, Hawaii
Re: Etx 105 not stopping at home position new [Re: demojohnny]
      #5557519 - 12/06/12 01:09 PM

I assumed that it used to stop at the home position?

How old is the scope?


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demojohnny
journeyman


Reged: 11/26/12

Re: Etx 105 not stopping at home position new [Re: Christopher Erickson]
      #5557558 - 12/06/12 01:30 PM

3 years, yeah used to stop until last night.

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Christopher EricksonModerator
Carpal Tunnel
*****

Reged: 05/08/06

Loc: Waikoloa Village, Hawaii
Re: Etx 105 not stopping at home position new [Re: demojohnny]
      #5558663 - 12/07/12 04:13 AM

Quote:

3 years, yeah used to stop until last night.




Sounds like a broken plastic tab inside!


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demojohnny
journeyman


Reged: 11/26/12

Re: Etx 105 not stopping at home position new [Re: Christopher Erickson]
      #5562285 - 12/09/12 11:43 AM

Yeah think the tab inside is gone. Could anyone let me know what the Az number on the scale round the sides is when they their etx hits the furthest point / home position. I will just have to rig a temp fix till I can send it away.
I have take the base off but the hex needed to take the clutch lever is tiny 0.5m maybe so can't get inside to have a look.


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Christopher EricksonModerator
Carpal Tunnel
*****

Reged: 05/08/06

Loc: Waikoloa Village, Hawaii
Re: Etx 105 not stopping at home position new [Re: demojohnny]
      #5562398 - 12/09/12 12:41 PM

The Az scale slides around so I am not sure if there is much help there.

Be careful not to twist up the wires through the Az bearing too much...


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radial195
member


Reged: 08/31/12

Re: Etx 105 not stopping at home position new [Re: Christopher Erickson]
      #5593371 - 12/28/12 09:29 PM

I bought an ETX 105 for a Christmas present for my daughter (31, doctoral candidate @ LSU). We found the scope would not stop in the home position as well. Solution---remove the base, wiring, clutch screw, gearing and motor, fabricate a pin wrench to remove the large round nut holding the lower base assembly to the upper section (the fork arms are bolted to this part). The round plastic stop was found to be in perfect condition. There are 2 aluminum pegs cast on the upper and lower assemblies that the arms of the plastic thingy hit to stop rotation at the stops. The upper peg was broken o

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radial195
member


Reged: 08/31/12

Re: Etx 105 not stopping at home position new [Re: radial195]
      #5593382 - 12/28/12 09:34 PM

continuing-off, I drilled and tapped the upper plate and loctited an 8/32 setscrew in place. you will need to partially re-assemble the unit to test clearance with the lower peg, screw in the new 8/32 peg so unit will rotate 700 degrees. If done properly stops will work. You will need to cut the 4 wires going to the dec motor to get the clutch parts off and remove the big nut. Radio Shack has 4 pin polarized connectors to put the wiring back together.

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demojohnny
journeyman


Reged: 11/26/12

Re: Etx 105 not stopping at home position new [Re: radial195]
      #5624766 - 01/15/13 04:35 PM

Cheers, I line it up manually and then let it align it works fine. Spoke with Meade and the issue continually winding the cable loom. So as long as I don't wind to much in either direction it will work ok.

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demojohnny
journeyman


Reged: 11/26/12

Re: Etx 105 not stopping at home position new [Re: demojohnny]
      #5852186 - 05/10/13 02:57 PM

What is on the Az when you have your scope locked is it 16/8 or 8/16 or something else.

Thanks


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demojohnny
journeyman


Reged: 11/26/12

Re: Etx 105 not stopping at home position new [Re: radial195]
      #5853859 - 05/11/13 01:56 PM

Hi how do you unscrew this part? Which allows the bottom and top to be separated to get access to fix the hard stop?

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radial195
member


Reged: 08/31/12

Re: Etx 105 not stopping at home position new [Re: demojohnny]
      #5855160 - 05/12/13 10:29 AM

Loosen the set screw on the az lock handle, remove it, hold the clutch and unscrew bolt az lock handle attaches to. Az lock handle is used to unscrew bolt, 1/8 turn at a time. Once bolt is backed out enough clutch will clear 2 slots in gear and can b unscrewed by hand the rest of the way.

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radial195
member


Reged: 08/31/12

Re: Etx 105 not stopping at home position new [Re: radial195]
      #5855166 - 05/12/13 10:34 AM

The round thing below the gear, with the hole visible @ 2 o'clock is a nut that's locktited to the shaft. That's what you need the pin wrench for mentioned higher up in this thread. It helps to have a very small torch to heat the nut to break the loctite bond. Check Weasner's ETX site for more info.

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radial195
member


Reged: 08/31/12

Re: Etx 105 not stopping at home position new [Re: radial195]
      #5855192 - 05/12/13 10:46 AM

Remove all the circuit boards, etc. before surgery so you don't accidently break/melt them. You can't buy replacements anymore. As u unscrew clutch bolt push down to let clutch clear slots in gear. Where r u located?

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demojohnny
journeyman


Reged: 11/26/12

Re: Etx 105 not stopping at home position new [Re: radial195]
      #5855434 - 05/12/13 12:51 PM

I was planning fabricating something to create a hard stop, as pegs have snapped. Have put it back together as have some real work to be going on with.

Is there any hard stop fix out there I have seen the one on weasner but that looks like a jump of a peg. All the plastic teeth are broken of my disc that goes round the shaft. Both upper and lower metal pegs are in place.


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radial195
member


Reged: 08/31/12

Re: Etx 105 not stopping at home position new [Re: demojohnny]
      #5861837 - 05/15/13 10:38 AM

Good Luck! Only solution now is to find some plastic and make a new disc. Hope it works for you!

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