ER-301/Maintenance and Repair
Replacing the CPU Board
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.
- Purchase a replacement CPU board (AM3352-SOM) from Olimex for about 37EUR: https://www.olimex.com/Products/SOM/AM3352/AM3352-SOM/
- Remove the rear uSD from the old CPU board and insert it in the SD slot on the new CPU board.
- 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.
- 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:
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: