Question about Meade ETX-90EC (325 x 90mm) Telescope

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I purchased a used etx90ec. Two of the battery terminals are moderately corroded. The lights on the control do not come on and it doesn't work.

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If you can clean up the battery terminals with sandpaper, then you will need to try an outside power source.

Buy either the 110 volt adapter or BETTER but a 12 volt power pack at Wal Mart (the kind you use to start a car) make sure it has a 12 volt cigarette lighter style plug.

You can buy either the 12 volt power cable or tthe 110 volt adapter from www.scopestuff.com. I never use the internal batteries, always a 12 volt power pack. The ETX likes steady 12 volt current.

If it does not work with the outside power source then something is burned out on the main board. You will need to return it to Meade for repairs. Here are several links you need.

http://www.meade.com/support/index.html

http://scopestuff.com/ss_cig1.htm the 12 volt cable

Posted on Dec 10, 2009

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Fist thing to try for a quick fix would be to clean terminal posts. It's a pretty easy do-it yourself project.

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I used your site to research the problem further. I found an answer which recommended rubbing the suspect terminal lightly with a pencil eraser. It worked! I now have battery power and my headset works fine.

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