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  #11  
Old 07-22-2008, 10:34 PM
Norman CYYJ Norman CYYJ is offline
 
Join Date: Feb 2005
Location: Victoria B.C.
Posts: 1,265
Default

Not only does the internal battery need to be replaced on hand-held GPS's but panel mount units also have the same problem after a few years. Changed many of them over the years.
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  #12  
Old 07-23-2008, 08:07 AM
Derrell Derrell is offline
 
Join Date: Jan 2005
Posts: 140
Default Radio shack P/N

Radio Shack #'s: CR1220 Battery Holder 270-0008
Battery CR1220 23-188

My total cost including tax was less than $7.00 in GA
Quite a savings over Garmin's $350. Tnx for the post

Derrell
RV7A Sold & flying
Zenith CH701 in progress
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  #13  
Old 08-02-2008, 08:20 AM
Dave62 Dave62 is offline
 
Join Date: Jul 2007
Location: Berea KY
Posts: 63
Default

Update...or info I have found from Garmin and others....

The problem with the internal clock is the battery....this has been established including how to change the battery....

The new info is that the battery is rechargable....as can be confirmed by the battery makers web site. Also Garmin is now saying this...depending on who you talk to. The issue is however that the internal clock battery only recharges when the unit is on...no when we charge the main battery.

It can take up to 24 hours of continuous use to completely charge the internal clock battery. Garmin is saying to use the unit at least 4 hours per month to keep the internal battery charged. Som of us dont fly that much....therefore the problem.

The solution is to hook the 396/496 to the external charger and turn the unit on for at least 8 hours per month. This keeps the "clock" battery happy. DO NOT SEND THE UNIT TO GARMIN without trying this first. They will change the board/battery and charge you $350!!!!! We fond this info out after a returned unit would still not keep time....and after multiple phone calls to Garmin.

I hope this helps save someone some money and agravation.

Dave62 (Swift Driver)
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  #14  
Old 08-02-2008, 04:33 PM
jmbaute jmbaute is offline
 
Join Date: Feb 2005
Location: Blacksburg, VA
Posts: 149
Default

I have been having this problem (not finding satellites) and talked to Garmin at OSH. They admitted it was a known issue and did a firmware update for me at the show, which was supposed to fix it. THey also said that dumping tracks/almanac data will help. They never mentioned the battery.

Just a data point. It could have been just a way to get the confrontational guy out of the booth.

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John B
Mooney M20C (KPSK)
RV7 Wings

www.pdfplates.com
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  #15  
Old 05-28-2009, 02:19 PM
longranger's Avatar
longranger longranger is offline
 
Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,867
Default This thread alone worth the donation!

Thank you Doug for making this community possible! This thread alone saved at least several times the amount of my annual donation. (And I'd rather see you get the $ than Garmin, anyway. )

Since last spring, life happened, and I went close to a year without using my 296. I powered it up a couple of weeks ago and it wouldn't acquire satellites, even after leaving it on for 5 minutes the satellite status page showed flatline on all channels. It had NEVER taken anywhere close to that long to find itself. I checked the manual, and the word "troubleshoot" does not appear ANYWHERE in it.

Before giving in and having Garmin look at it, I decided to search the VAF forums, and found this thread, among others. Before reading this, I had not even noticed that the clock was off. I left the unit on for 15 minutes and voila, it eventually started tracking satellites.

The next problem occurred almost immediately when I turned off the unit to let the main battery charge, and got a "Battery Missing" message. The unit would not power on unless connected to an external source. The main battery was obviously not "missing", so I reread this thread and noticed that that message refers to the clock battery, not the main battery... something that Garmin support folks don't even seem to know.

I also learned that the clock battery is rechargable (the unit has to be ON; that's why it died after months of disuse), so I didn't need to immediately go tearing into the unit to replace it. (There's also a thread here detailing how that is done, should it ever become necessary). Sometime during the second hour of ON time the unit finally decided that the battery wasn't missing after all, and life is now good. Now, by the time I get through the legalese screen, the unit is tracking a 3D solution.

Garmin Service: $350 saved. New main battery: $60 saved. VAF forums: PRICELESS!
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Miles (VAF# 1238, Paid up as of 2018)
RV-7 TU 904KM (reserved)
Wings Fitted and Finish Kit on site

Construction Log
Picasa: Empennage Album, Wings Album, Fuselage Album

1955 Cessna 170B flying since 1982

'To get something you never had, you have to do something you never did.' -Unk.
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  #16  
Old 05-28-2009, 03:03 PM
andrew phillips's Avatar
andrew phillips andrew phillips is offline
 
Join Date: Dec 2006
Location: Carp, Ont
Posts: 347
Default battery danger

what happens to the guys who replaced the battery with one that is not meant to be recharged? Maybe the current level is so low it doesn't matter but with regular batteries there is fire or rupture potential by using non rechargeable batteries in a charger.
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  #17  
Old 05-28-2009, 07:57 PM
bhester's Avatar
bhester bhester is offline
 
Join Date: Jan 2005
Location: Hopkinsville, KY
Posts: 956
Default Instructions and picture here!

I replaced my battery back in Feb. 09 and it has been working great.
The details and pictures are on this web page scroll down to Feb. 17 and 22.

http://home.newwavecomm.net/bobbyhes...JulyFlying.htm
__________________
Bobby Hester - Builder/Pilot/A&P
Surfing the web from Hopkinsville, KY
N857BH RV7A XP-O360 - Garmin G3X ADS-B IN/OUT 2020 Compliant
Web site: http://www.newtech.com/bobbyhester/RVSite.htm
Dec. 2019 VAF donator - alot better than any magazine subscription
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