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LX200 gps declination tracking is dead

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#1 big bakerman

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Posted 04 November 2019 - 11:28 AM

Hi everyone,

after nine years I decided to start again with my telescope.The polar alignment works perfect but when I want to follow an object

it seems that the declination tracking doesn't work at all. I thought that the declination motor drive board was damaged and replaced it.

But the tracking still don't work at all.

Any suggestions?

BB.



#2 rferrante

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Posted 04 November 2019 - 01:01 PM

Does the declination motor work when you direct the scope with the arrow buttons, but not when it is tracking? That might mean it thinks it is in polar alignment mode instead of Alt-Az. But if it simply doesn't work no matter what, you should try to verify all of connectors/cables etc. are making good contact. That's a common source of problems especially with a long time in storage.

 

--Rob



#3 big bakerman

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Posted 04 November 2019 - 02:12 PM

Hi Bob,

thanks for the reply. The declination motor works perfectly  when using the arrow buttons and also during the alignment procedure.The problems begin after the alignment. I also tried the PHD2 software for guiding several weeks ago.

And I already have disconnected the connectors a few times.

BB



#4 OzAndrewJ

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Posted 04 November 2019 - 02:26 PM

Gday BB

Not sure i understand

In Polar, the DEC axis doesnt "track" as such

Have you done the calibrate process in PHD2, and if so, did it indicate you had a bad DEC backlash???

You may need to redo the Drive train and then up the backlash percentages to get it to reverse in a reasonable timeframe.

Andrew Johansen Melbourne Australia



#5 big bakerman

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Posted 04 November 2019 - 03:08 PM

Hello Andrew,

thank you for the reply..

I"m going to try this out .

BB



#6 big bakerman

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Posted 05 November 2019 - 12:29 PM

Hi,

today I did the " train drive". Everything was perfect.

Then I did a polar alignment (by daylight). After the alignment the message"motor stalled" suddenly appeared.

It said that overloading or a weak battery could cause this error. So I took the Tele Vue away.(I didn't mentioned it in my earlier posts that he was lifting)

And the battery in the base is renewed when I started up again my lx 200.

The problem isn't solved yet.

What now?

BB



#7 OzAndrewJ

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Posted 05 November 2019 - 04:26 PM

Gday BB

Motor Unit Fault is declared when either motor card gets a command to move and doesnt report any movement.

If the motor starts, and ramps up to full speed, the fault is normally in the encoder or its feedback loop.

If the motor wont work at all, then you need to find out why.

You can put raw 12V into the motor wires to see if the motor spins.

If it does, it starts to get more difficult tracing back

 

Andrew Johansen Melbourne Australia



#8 big bakerman

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Posted 06 November 2019 - 10:52 AM

Good afternoon,

today I tried  almost everything that's possible with the handcontroller.

First I've checked the voltage of every little wire of the main connector of the dec board.

Everything was ok. The dec motor reacted immediatly at every command with the arrow keys.

Calibrating home, calibrating sensors in Alt/az mode, then polar alignment.....without any problem .

Dec guiding north only: no tracking. Dec guiding north and south: no tracking.

Next step: reset to factory settings. and everything I've done before. No tracking.

Then it has to be the encoder?I've seen a lot of different pics of the dec motor on internet but I don't see any encoder wheel at the pics. Is it located on the left side in that thin part close to the gears ?

And if so, what can I do?

BB



#9 rferrante

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Posted 06 November 2019 - 12:20 PM

If you are polar aligned, the DEC motor normally would not be involved in tracking, only the RA motor.

 

You might want to try using the scope in Alt-Az instead, both motors would need to track and you can listen for one of them not running.

 

--Rob



#10 nitegeezer

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Posted 06 November 2019 - 02:04 PM

In polar mod the Dec motor does not need to move so it does not "track". It will run for the go-to which sounds like yours works, and then respond to guide inputs. If you are using a guide cable, I would check it and the connectors and then possibly the source. With pulse guiding from a computer, if RA guides then Dec "should" as they use the same hardware for the command, and then I would guess corrupt firmware.

#11 big bakerman

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Posted 08 November 2019 - 01:53 AM

Good morning,

thank you for the replies!

When I have the time to try this out, I;ll let you know the result.

A better polar alignment and only the telescope, no pc connected....

BB



#12 nitegeezer

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Posted 08 November 2019 - 02:32 PM

You mention guiding but are not using a PC. What are you using to guide with?

#13 big bakerman

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Posted 11 November 2019 - 11:15 AM

Hello Chuck,

I believe that I wasn't very clear in my explanation...My polar wedge and PHD2 are new stuff to me.

I already have my wedge for several years but I never used him. En because I want to start with taking pics,  I installed PHD2.

I have choosen for a lot of problems using them together for the first time.lol.gif 

But Saturday things went better. After a good alignment I followed Vega with an illuminated eyepiece. After 30 secs I've stopped counting.

And let's hope that tonight has a clear sky !

To be continued....

BB


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