ER-301/Maintenance and Repair

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< ER-301
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Replacing the CPU Board

This is the CPU board on the back of the ER-301. It holds the CPU, RAM and uSD card which contains the firmware. This CPU board is manufactured by another company called Olimex.

Sometimes it is necessary to replace the CPU board on the ER-301. This process is easy and safe as long as you take your time, take basic anti-static precautions and do not force anything.

  1. Purchase a replacement CPU board (AM3352-SOM) from Olimex for about 37EUR: https://www.olimex.com/Products/SOM/AM3352/AM3352-SOM/
  2. Remove the rear uSD from the old CPU board and insert it in the SD slot on the new CPU board.
  3. Carefully pull off the old CPU board by prying up each side little-by-little. Do NOT try to forcefully pull it off all at once.
  4. Carefully align the pins and push on the new CPU board.

Also, here is a very informal video showing how:

The section that deals with removing the CPU board starts at about 2 minutes into the video.

Re-aligning the Small Display

If for whatever reason the small (sub) display becomes slanted due, here is a video showing how to realign it without having to remove the front panel:

Replacing buttons

If you feel confident removing the panel on your ER-301 and replacing button caps, you can try doing it yourself. The part number for the gray buttons is D6C10-F1-LFS:

Mouser https://www.mouser.com/ProductDetail/CK-Components/D6C10-F1-LFS (Ignore the round green button in the picture.)

Digi-key https://www.digikey.com/products/en?WT.z_se_ps=1&keywords=D6C10-F1-LFS (Ignore the black button in the picture.)

I find that prying off the button caps is most conveniently done with a 2mm flathead screwdriver. Here is what the process looks like: