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Garmin Zumo 390 LM charging issue

Discussion in 'Technical Discussion' started by Stuart D, Apr 10, 2019.

  1. Stuart D

    Stuart D Active Member Forum Supporter

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    I have a 390 which I have used on my @ without a problem until now. When I put the Zumo on mains charge the green battery light gains a charge (lightening flash) BUT when I put on my @ & my Varadero the green battery light doesn’t change. The mount & cable on my @ is 3 years old but on my Vara is brand new, I’ve put a meter on the pins on both bikes & both showing 5.1-5.2v, the cables are wired into additional fuse boxes & fused at 3A.
    Any suggestions or recommendations for Garmin repairs please?
     
  2. Lutin

    Lutin Administrator Staff Member Forum Supporter

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    This is an odd one alright. Sorry to ask the question, but are you sure that the unit's not charging when on the bike?
     
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  3. Dee Dub

    Dee Dub Active Member Forum Supporter

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    I have the same problem. Charge from mains and the battery will last for a while. But after it's been in the cradle for a while, it lasts just a few minutes. Sorry, that doesn't help you!!!
     
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  4. Stuart D

    Stuart D Active Member Forum Supporter

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    It’s not showing the ‘lightning flash’ symbol when on either bike but does on mains. I haven’t used it since September & that was on my @ but I went out with DeeDub on @ a fortnight ago & it went flat, last weekend on my Varadero & went flat on that. I’ve raised the issue with Garmin & they haven’t highlighted the fact that it doesn’t show the charging symbol on the motorcycle mount.
     
  5. Lutin

    Lutin Administrator Staff Member Forum Supporter

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    Hmm. not come across this "lightening flash" symbol before - it's not on my 340LM model.
     
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  6. Lutin

    Lutin Administrator Staff Member Forum Supporter

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    It would appear that the 390 is very similar to my 340. At least, the only manual I've come across covers the 3x0 series - and the images of the units look very similar.

    Anyway, try this -

    340LM Start Up screen.jpg

    On the start up screen, touch the screen in the upper right hand corner (over the battery symbol) and hold it there for 3 seconds. (I have to use the very tip of my little finger for this.) The screen will change to something like this -

    340LM Info Screen.jpg

    Here you can see all sorts of useful information - software version, current time (live - it updates constantly), battery voltage (again updates constantly), battery capacity etc etc.

    From the above photos, my unit's battery symbol (on the start up screen) is not quite fully green, so is not at full capacity - and on the info screen the "Battery Capacity" is given as 87. The "Battery" is also shown as "Ok Cap".

    Any use to you?
     
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  7. Stuart D

    Stuart D Active Member Forum Supporter

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    That’s interesting, do you still have your 340? If you do does the battery indicator change when you install it into the bike mount? ie does it gain the charge symbol like it does when charging on the mains please?
     
  8. Lutin

    Lutin Administrator Staff Member Forum Supporter

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    Well look at that, there is a lightening symbol after all -

    340LM On-Bike Start Up screen.jpg
    How did I miss that? Must be such a long time since I've used it. :whistle:


    And here's the on-bike info screen -

    340LM On-Bike Info Screen.jpg

    As you can see, the "VMAX" reading has changed, "Battery" is now "Charging", "Batt Current" is 353 mA (this updates constantly), "Batt Voltage" is 4.13V, etc etc
     
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  9. Dee Dub

    Dee Dub Active Member Forum Supporter

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    If you aren't getting a charging symbol when it's in the cradle, the obvious thing to check is that the connectors are clean. I'm still not much help am I?

    My old Zumo 550 got really, really wet a few years back and thereafter refused to charge from the cradle. I was never able to discover the problem and ended up replacing it.

    I'd better stop contributing!
     
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  10. Stuart D

    Stuart D Active Member Forum Supporter

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    In your last post was the sat nav on the bike for both pictures ie home screen & info screen? Apologies for asking a stupid question.
     
  11. Stuart D

    Stuart D Active Member Forum Supporter

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    765BE9BF-2068-4E1A-A82D-1CD6BFF6AA5E.jpeg CCFBFD27-A4F2-4B2F-96AA-FA49BF75E2EF.jpeg Well the plot deepens, just tried it in both bikes & it detects it’s in a mount! First photo is in my hand, second was the same for both bikes.
     
  12. Lutin

    Lutin Administrator Staff Member Forum Supporter

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    Ah, it might detect that it's in a mount but I don't think that it's charging.

    "Power SRC" in both cases is "BAT" and not "EXT".

    My unit shows "Power SRC" as "BAT" on the bench and "EXT" when on the bike.
     
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  13. Stuart D

    Stuart D Active Member Forum Supporter

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    Many thanks, I’m now fairly sure it’s the sat nav unit. I previously used it in September when I followed the Touratech Country Tracks Portugal & it performed faultlessly. Awaiting Garmin’s response.
     
  14. Lutin

    Lutin Administrator Staff Member Forum Supporter

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    Glad to be of some help.

    Keep us informed of how you get on.
     
  15. hotbulb

    hotbulb Active Member

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    I've a 390....... a while ago it didn't seem to be charging in the bike mount, and I found that one of the tiny gold pins in the mount wasn't sliding in and out as it should. A quick poking, and a drop of ACF50, and it's been fine ever since.
     
  16. Stuart D

    Stuart D Active Member Forum Supporter

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    The one mount is a few years old but the other mount on my Varadero is less than a month old, I did check the pins were springy, thanks.
     
  17. Stuart D

    Stuart D Active Member Forum Supporter

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    Garmin support have emailed me today agreeing that it’s an internal problem and unfortunately the unit is out of their 2 year warranty. They’ve offered me a factory reconditioned replacement for £85, My unit is at least 4 years old so I think I’ve had a result. Thank you Garmin & many thanks to all who’ve offered constructive advice to my plight.
     
    Last edited: Apr 16, 2019
  18. Lutin

    Lutin Administrator Staff Member Forum Supporter

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    Hopefully your replacement unit will see you getting lost in some new and interesting places. :)
     
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  19. Lutin

    Lutin Administrator Staff Member Forum Supporter

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    Just in case anyone's interested, I've just discovered how a Garmin unit knows when it's in a mount. There's a small magnet fitted into the mount that affects a reed switch (or possibly a hall effect device) inside the unit. Which will be why Stuart's unit knew it was in a mount, even though it wasn't charging.

    The only reason I discovered this is that I've just taken delivery of a car mount for my unit and there's a rather obvious small round magnet (and yes, I've checked that it is a magnet) built into the mount. The small round silver whatsit in the photo below -

    Car mount.jpg

    The position of the magnet corresponds to the top edge of the unit.
     
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  20. Stuart D

    Stuart D Active Member Forum Supporter

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    4F3D7923-E970-42F2-9707-01B402959C62.jpeg Well refurbished Zumo has arrived & hey presto when fitted to both bikes I now get a charging symbol
     
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