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joeke3el
member
Reged: 02/04/07
Posts: 38
Loc: Saylorsburg, PA
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Recently I noticed that battery power no longer works on my ETX 90AT. I use a power supply all the time but recently tried battery with no luck. As an amateur radio operator I have some experience with circuit boards but I can't detect anything wrong visually. Power makes it to the board but that's all. It runs fine on the external supply.
This is a drag as I wanted to sell it. I'm willing to drop the price but really prefer selling things in 100% condition.
Has anyone else here had this problem with an ETX?
Thanks,
Joe
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Orion Atlas 10 EQ-G Reflector with GoTo Controller
Astro-Tech 66mm f/6 ED Refractor
Meade ETX 90AT UHTC, 497 Autostar, 884 tripod
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Treehopper
professor emeritus
Reged: 07/29/08
Posts: 582
Loc: Upstate NY
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It's not unheard of for the battery leads to work themselves loose over time, but if you've already checked continuity and they're juicing the board, then I'm stumped. Have you checked Weasner's website yet? They have some uber-tech folks over there that might offer more insight.
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Tim
Champion of small aperture scopes everywhere!
Meade ETX-125PE
Meade ETX-80
Celestron FirstScope 76mm Mini-dob
 Updated: 09/16/2009
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astrowolf67
member
Reged: 12/15/07
Posts: 94
Loc: Western Kentucky
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I don't know what type of AC adapter jack the 90's have, but, on most electronics, the adapter jack has a built in switch, which breaks the circuit from the battery pack. It's usually a spring steel connector in the jack itself. If the 90 is designed this way, is it possible that the switch could be worn out?
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David
"Seek the Spirit of the Wolf, for He holds the Secret of Life."
Edmund Astroscan/Meade DS 2000 tripod
Meade ETX 60
Tasco 60mm EQ
Meade 114 NT/LXD75
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Joe Lalumia
Post Laureate
Reged: 01/24/07
Posts: 3606
Loc: Rockwall, Texas, USA
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astrowolf is correct. The switch is bad. Open it up and take a look. When you use an external power source it turns OFF the battery power. The spring is stuck most likely.
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LX90 8" LNT, SV Nighthawk & TelePOD, SV 80/9D & M4 mount, ETX 90, Orion XT10i, 20x80 binoculars, SV-BV3s-- www.texasastro.org
"Great minds discuss ideas;Average minds discuss events;Small minds discuss people." Unknown
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joeke3el
member
Reged: 02/04/07
Posts: 38
Loc: Saylorsburg, PA
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Quote:
astrowolf is correct. The switch is bad. Open it up and take a look. When you use an external power source it turns OFF the battery power. The spring is stuck most likely.
Thanks guys, I'll be checking it tonight!
Joe
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Orion Atlas 10 EQ-G Reflector with GoTo Controller
Astro-Tech 66mm f/6 ED Refractor
Meade ETX 90AT UHTC, 497 Autostar, 884 tripod
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Treehopper
professor emeritus
Reged: 07/29/08
Posts: 582
Loc: Upstate NY
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Completely forgot about the micro-switch in the adapter coupling. I haven't had one gum up or get stuck in any device in quite a few years, but it can happen. A small pick can gently persuade the switch. In some rare cases, the switch itself can just "wear out" and stick in either a short or open condition. At that point, you may need to head down to the local Radio Shack and replace the assembly.
Look at it as a means to keep your soldering skills honed. 
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Tim
Champion of small aperture scopes everywhere!
Meade ETX-125PE
Meade ETX-80
Celestron FirstScope 76mm Mini-dob
Updated: 09/16/2009
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