Garmin GPS 12map

• Garmin GPS 12map
  Posted by rz on 07 Nov, 2019 15:35
• I've got a dead Garmin GPS 12map. It doesn't switch on, no display and welcome screen. I opened the case and tested the memory battery voltage, 0.5v. So, I desoldered the memory battery. After that I tested some voltages. When I push the power on button, Vcc of 80386 and AM29LV160BT are about 3.0V. Vcc of LP324 is about 25v. Frequency CLK2 of 80386 is 33MHz,  CLKOUT is 16.5MHz. RESET pin is 3v, and no high-to-low transition. That's all I have tested.
  
  Is there some service manual or knowledge to repair this GPS? I like the GARMIN GPS 12 series very much, quality PCB and components, solid case, simple and clear display. Hope it can works again.
  
  Thank you.

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• #1 Reply
  Posted by DRM2 on 26 Apr, 2020 15:27
• same exact issue here.
  did you ever resolve it?
• #2 Reply
  Posted by coromonadalix on 26 Apr, 2020 16:48
• An intel 386 sx in there ?  seems to pack some punch ??
  
  
• #3 Reply
  Posted by rz on 31 Mar, 2023 04:28
• Quote from: coromonadalix on 26 Apr, 2020 16:48

  An intel 386 sx in there ?  seems to pack some punch ??
  

  
  it's a intel 386ex, embedded variant of 386sx.
• #4 Reply
  Posted by eTobey on 31 Mar, 2023 05:50
• I once fixed my HDD with reflowing it in a pan. This might work here too?