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Di2 shifter fix: microswitch rebuild

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Di2 shifter fix: microswitch rebuild

Old 11-03-22, 09:58 AM
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BTinNYC
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Join Date: Oct 2021
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Di2 shifter fix: microswitch rebuild

After crashing and dropping the bike on the right side, the R shifter upshift lever no longer made a click or operated the RD. All the other levers worked. The electronic functions were checked OK with e-tube.

I've worked on switches in audio and computer equipment and was confident/hopeful it was the microswitch.
Micro switch attached with two #5 torx screws.


Besides the miniature torx driver, a couple thick towels are required to catch the tiny springs and things. I laid the handlebars into a big chair draped in towels so the parts only fell a couple inches. I didn't get many pictures because I was using all hands fiddling the bits.

The parts are; the wired switch, 2 small springs to activate switches, 1 big return spring, and a plastic guide piece.

The springs all have a plastic end, and that end goes toward the switch. The return spring sits concentrically around a switch spring, on the left in this picture.


Plastic guide held against the switch.


To put it all back together, place the plastic guide piece into the lever body (not like the photo above). Put the springs onto the switch and push that group into the guide piece and replace screws. Took me about ten tries, probably not the morning for 3 cups of coffee.

Shifter is back to normal. I bet the crash knocked the switch spring out of place.

Last edited by BTinNYC; 11-03-22 at 10:06 AM.
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