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LX600 16" Motor Malfunction/Handbox Dies-Chapter Two

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#1 jmdonohue

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Posted 08 October 2019 - 10:15 PM

Shoutout for next step Suggestions:

Over my last 2 observing sessions ( totaling ~8 hours) my scope has experianced several different malfunctions. Now AutoStar 2 ( 1.1H ) does not start up on power on. On power on autostars screen is blank. Just a dim red glow (indicating power) but no script. No welcome to AutoStar, or "0 for align or mode for menu" message. Additionally the handbox arrow keys to not activate the Dec or Ra motors. The handbox is a dead terminal at this point. Front panel Power light IS illuminated. This scope failure started like this:

 Observing session #1 two weeks ago Dec motor, out of the blue, followed by Ra motor started running on there own, I powered off to initiate a stop. When powered on again all scope functions were normal for 5- 10 minutes. During that 5-10 minutes the handbox functioned and I had access to autostar menu screens. Then  both motors malfuctioned , 1st Dec then Ra with self intiating at full speed ( Dec downward/Ra counterclockwise). I shouted out for help. Meade support felt dual motor malfunction was odd and thought faulty power supply likely. I replaced power supply ( and new handbox and cable) and all seemed fixed.

 Session # 2 last night ( clear skies, 1st in 2 weeks) Scope started up normally. I reset, autoaligned,erased Ra & Dec Pec for fear of corruption.

Trained Pec and performed several flawless goto's, observed for several hours until drive motors malfunctioned again.

I changed to a new power suppy,new handbox, new cables, secured all connections even under main control panel. After powering on again all functions seemed normal. Per "Cloudy Nights" (after session #1 malfunction) I turned off Starlock. I realigned and several goto"s executed perfectly..Then on next goto handbox indicated " not Aligned" a new message for me. I performed another autoalignment, scope again functioned normally. The loss of alignment, out of the blue, concerned me. So I parked the scope and powered down normally. When powering on again the scope is dead , non responsive. Just dim red glow on hand controller. 

Any thoughts on the source of this type of scope failure? Any suggestionson on returning LX600 to normal function?

Thanks for reading this farconfused1.gif



#2 jmdonohue

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Posted 03 November 2019 - 07:19 AM

Meade support felt , at least, bad power panel. I'll install new power panel once it arrives.

Any other sugesstios to correct runaway slewing in both Dec and Ra?



#3 Digital Don

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Posted 03 November 2019 - 05:26 PM

Hi jm,

 

What are you using to power the scope?

 

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#4 dcaponeii

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Posted 06 December 2019 - 05:08 PM

That what happened with my LX-600 a few months back in RA.  Meade had to replace a bad board in the scope to correct the problem.  Scope came back over the summer and all has been find since.  I thought it was a bad RA encoder (sensor) but they said the board was bad.  One note of caution, when the scope returned from the factory one of the Dec locks had spun itself all the way off of the spindle.  Scope has been working fine (about three months now).


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#5 carolinaskies

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Posted 08 December 2019 - 01:41 PM

Definitely OP issue sounded like a bad board.  When power up/down causes inconsistent results that's a clear sign of board component failure.  


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#6 jmdonohue

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Posted 02 February 2020 - 12:27 AM

 On this LX 600,16", replaced with new both front panel control board and dec motor driver board. Again secured all connectors.

 switched to several new power supplys ,hand controlers and their cables.

 When powering on hand set does not get past Meade screen. Occansionally the dec motor starts running without commands and only stops with powering off.

Ra motor will on ocassion runnaway on its on but stops on its on after less than a minute.

 Have not yet examended the Ra board and RA motor gear box and their connedtion due to the need to completely disasemble the 320 lbs scope and mount to flipit offer. But I guss that what is next.

Does any one know someone whom can bench test all cercit boards and connescts if I commpltely gut them

from scope frame?




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