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Last updated: 15 April 2012

Mike here: Consider this a "better safe than sorry" warning. I have never had this problem with any of my AutoStars. If you have, please let me know at Thanks.

Subject:	Autostar Quick Battery Check
Sent:	Monday, August 8, 2011 05:59:37
From:	Mike Hogan (
I've noticed that you often recommend changing batteries or power source
as the first step when troubleshooting many problems. If the Autostar is
working, there is a quick way to check the status of the power using the
'Status' Menu (MODE for 2 seconds). The last item in the menu is
'Battery Level' and shows voltage of the power source as a percentage.
I've found that the 'scope may start behaving erratically when this
value drops to about 75% but I recharge my external Power Pack when it
falls to 85% just to be on the safe side. If the level falls too low, it
can corrupt the memory, requiring a RESET or even a reload of the ROM.

Just thought I'd pass this along.
Mike Hogan
Mike here: If low battery power can corrupt the memory, that could be a serious problem with the AutoStar #494, which does not have a user reload ROM capability.


I don't have any experience with the #494 so don't know if low power
will have the same effect. I know my #497 got corrupted once and I think
it was low power but can't be 100% positive.

Subject:	Low Battery Warning [NEW!]
Sent:	Thursday, April 12, 2012 21:01:22
From:	gary chance (
This is a great site with alot of great info! I juts wanted to add to
the low battery problem, and how it can relate with a 494 autostar. A
few weeks ago i bought a etx 70at from ebay. When i got the scope it
looked great, i then found the flip mirror had come unglued and was
lodged below the flip holder. I used your site and repaired it myself
(thank's to this site) I powered up the scope (a battery was already in
it and when i flipped the switch i came on so i went with it. The
autostar went through setup screens and then tried to slew to cirrus.
After playing with it for awhile during a slew the screen keep
flickering, would even go out for a bit, then come back on. Then it gave
me a motor fault. SO it went to train motors then died again in the
middle of this. Come to find out the person i had bought the scope from
must have lost the battery pack and just had a single 9 volt installed.
I ordered a external dc adapter and ac kit, and now use a jump start
battery pack with the dc adapter which works great. But i think the low
power must have fried my 494 autostar, because it go's through the setup
menus, but gets stuck at daylight savings time. All i can do is use the
autostar to control the scope which it still does. So i think the low
power did fry it. I have a new 494 controller should be here tomorrow
sure hope this one does not get fried to, but after reading what i have
here, i think it was the 1 9 volt battery and being under powered. Hope
this helps someone else not to fry there 494 (there hard to find)

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