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Gemini 1 Failure Modes That Can Drain Internal Battery


 

Basically, what the title asks.

I have an older Gemini 1, L1.02 control unit.? It seems to go through batteries, draining them in a matter of minutes, getting CMOS resets only minutes after changing the battery out.? But the unit works fine immediately after a battery change, even when quickly rebooted after the battery change.? Then, after being shut down for maybe 10 minutes, upon power up I get those normal "......"'s then an "X" before the display begins the start up scroll and a CMOS reset happens.? Once the mount and location data is reloaded, everything works fine.? Just don't shut it off.??

If this is indeed a known with some units, can it be fixed?

Jeff


 

Jeff

i??? Is it one with the CR2032 battery??

If "yes" .....the battery holder positive has 2 small "finger" clips that either one or both have a habit of getting caught under the battery, as a new battery is inserted.?? This shorts the battery positive to negative.? The result......your battery drains rapidly.? Seen this before, more than once.

Other than that there could be a bad SRAM IC (U9) or RTC IC (U2).? If this is true then one of them will be getting quite warm to finger touch.?

The battery can be fixed by bending the contact back up but might be best to send it to have the battery holder replaced.?? If its not the battery holder and is anything else.....needs to be sent for repair and a firmware update.? SRAM ICs are a known issue in failing easy enough to replace.?

Repairers for G1s are Michael Herman (USA), David Partridge (UK) and my self (Australia), contactable in this forum.? If you send it for a battery holder replacement ensure you tell the repairer so they have one waiting for replacement.

Cheers get back if you need any further help.?? All G1s are quite repairable.
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Brendan


 

Thanks for the reply and contact info Brendan.? It has the 2354 battery, but I also managed to break off the "+" tab last night but got it soldered back in place.? ?However, that's a good excuse to contact Michael Herman here in the States to get it serviced and checked out.

Jeff


 

BTW, I'm not very experienced in this group but how do I contact Mr. Hermann for servicing of my G1 unit?? He is not listed on the gemini-2 site and I can't find a member search function here.

Thanks!

Jeff


 

Jeff

try this email.? Best to find him in the Gemini 1 or Losmandy iO group forums.
mherman346@...

There was a mod for older units ....but from memory (pardon the pun) this took a few days to drain....but I could be wrong!

cheers

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Brendan


 

Hi Jeff

Michael is a long-time veteran here, i'm sure he'll see this :)

Brian

On Wed, Aug 5, 2020 at 5:31 PM Jeff B <mnebula946@...> wrote:
BTW, I'm not very experienced in this group but how do I contact Mr. Hermann for servicing of my G1 unit?? He is not listed on the gemini-2 site and I can't find a member search function here.

Thanks!

Jeff



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Brian?



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