Garmin 378 loses time and place

Discussion in 'Mapping & Navigation' started by Dagny_Taggart, Jul 30, 2009.

  1. Dagny_Taggart

    Dagny_Taggart John Galt - 2014

    Joined:
    Jun 30, 2006
    Oddometer:
    915
    Location:
    Flatlandistand, South West Ohio
    My refurbished unit is now 1 year old and has spent most of its life hardwired to my bike. Now if the bike is not ridden every 48 hours, the clock is off (about 8 hours for every 48 not locked on to satellite) and then it takes a really, really long time to find the satellites and start giving me position and speed.

    I don't spend that much time at warp speed that the clock should slow down that significantly.:hair The manual doesn't mention a keeper battery so...


    Yes, I tried search. It turns out Garmin 3 digit numbers, slow, time, and lost don't yield useful results in a GPS forum

    Thanks in advance for your help.

    Dags
    #1
  2. Dolly Sod

    Dolly Sod Red Clay Halo

    Joined:
    Aug 18, 2003
    Oddometer:
    14,072
    Location:
    Richmond, Va
    There's a watch battery soldered to the circuit board. You can disassemble the unit and swap it out.

    Here's a link to the topic

    LINK
    #2
  3. Dagny_Taggart

    Dagny_Taggart John Galt - 2014

    Joined:
    Jun 30, 2006
    Oddometer:
    915
    Location:
    Flatlandistand, South West Ohio
    Thanks, Gramps!!
    #3
  4. SnowMule

    SnowMule [angry moth noises]

    Joined:
    Jul 2, 2009
    Oddometer:
    19,104
    Location:
    I LIVE IN A GIANT BUCKET
    Yep, there is a small battery to keep the RTC operating. Keep in mind if you move the unit >200mi with it off, it'll take a while to figure out where it is again.

    At least that one has a shield over the receiver circuit... and make sure you put it back. My GPS12 didn't have any shield at all, and with it mounted on my sled the magnetos would generate enough noise to throw my position way off, or get a "Not Usable" message because it lost its lock. :splat
    #4
  5. Dagny_Taggart

    Dagny_Taggart John Galt - 2014

    Joined:
    Jun 30, 2006
    Oddometer:
    915
    Location:
    Flatlandistand, South West Ohio
    Thanks SnowMule. I mounted a Flip Video camera directly beside my GPS and the GPS went nuts. It did not like that electronic camera is such close proximity.

    I have ordered my battery from DigiKey... now I have to work up the courage to do the surgery. I really, really, really liked Garmin until this little undocumented issue came up.
    #5
  6. LeeU

    LeeU Been here awhile

    Joined:
    Dec 29, 2004
    Oddometer:
    326
    Location:
    Casa Grande,AZ
    Same thing happened to my 276C, disassembly isn't a big deal, just insure you have a steady hand when soldering the new battery in. My old battery was loose- off the circuit board and rolling around inside the case. The pics on the link showed me where to solder the new battery onto the circuit board. You'll need a real sharp soldering tip-- like pencil lead thin to insure you don't solder the leads together on the new battery. I ordered two just in case I screwed one up. You'll be amazed how small the battery is.:eek1
    Reassembly is a little more tricky-- I didn't have the brown ribbon connector connected properly and had no power when I tuned it on. Pics are great tool to help the repair!! Good luck!!:D

    Lee
    #6