Last updated: 4 September 2002

ETX-105EC DEC Wiring

Sent:	Monday, September 2, 2002 07:45:03
From: (Clay Sherrod)
To:	Markus
I can locate the wire positions, but right now I do not have a current
model to make sure that the board has NOT been changed.  Here is my
description of how the wires must go to the DEC motor control board

[hold board so that MOTOR is in the lower left corner and the four wire
junctions are at top right]
from R to L:

[hooks with blue wire connector clip....this order is from LEFT to R
with control panel at the BOTTOM of the drive base if you have the unit
laying on a table, bottom facing you]

How did the wires get pulled out of the blue wire/panel four-pin

Hope this helps.

Dr. P. Clay Sherrod
Arkansas Sky Observatory

----- Original Message -----
> In the declination arm there is a small circuit board (ntt motor controller)
> with a rotation sensor and some circuitry to drive the motor.  There are
> four wires (black, red, yellow, and blue) that were attached to the board at
> a jumper location marked jp2.  Those wires go through the groove in the
> center of the right ascension tension bolt.  The wires were also severed
> where they emerge from the tension bolt and the clutch assembly.
> From there, the wires go to the circuit board where the Autostar and
> accessories are attached.  I was able to replace the wiring from the motor
> controller, through the tension bolt, to the circuit board on the base, and
> replace the clutch assembly.  I don't know the order of the wires on the
> controller for the declination motor and in my hasty attempt to repair the
> scope before nightfall yesterday I failed to make note of how the two
> connectors plug into the board in the base.
> I appreciate your willingness to help and your prompt reply.  I've been
> kicking myself all morning...I should have just taken the time to send it in
> for warranty repair...I just didn't want to be without it because of
> something as silly as a bolt coming off of the RA drive mechanism.  I'll
> call Meade on Tuesday and ship it off.  In the meantime, I guess I'll do my
> observations in a pre-Lippershey fashion, or maybe it's time to buy that
> upgrade that I've been wanting.
> Thanks,
> Markus
> -----Original Message-----
> Hey Markus....tell me which wires pulled away from which boards....the
> damage can go either way and there can be as many as four wires involved.
> Let me know and I can help you....
> Clay
> ----- Original Message -----
> > Dr. Sherrod,
> >
> > I'm one of those morons that severed the wires leading to the declination
> > motor controller on an ETX.  I have an ETX105EC.  I can fix the problem, but
> > unfortunately when the wires were severed they were also pulled away from
> > the controller, so I don't know the order.  I suspect that you're going to
> > suggest that I ship my scope to Meade, but I thought that I would at least
> > ask to see if you know the correct order of the wires on the board.
> >
> > Thanks,
> > Markus
From:	Markus
Thanks Dr. Sherrod.  Your help is very appreciated.  According to your
notes I had the wiring correct.  I must have just plugged the blue
connectors into the circuit board in the base incorrectly and damaged
the handheld controller.

I don't want to take a chance on damaging my Autostar, so I'm set on
contacting Meade, giving them a run down on the damage, and taking the
cost as a lesson learned.  I have talked my wife into letting me order
an 8" LX200 to use while my ETX105 is out for repair.  That'll give us
two scopes to use and a good scope for our astrophotography projects.

Thanks again,


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