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Hi Folks,

Wonder if anyone can help me, or has had a similar problem.

I have a 6870 front derailleur that doesn't want to go into micro adjustment mode, when I click either of the left shifters (having pushed the button on junction A) it doesn't micro adjust, the red light just flashes on the junction box.

I can't find any thing in the documentation, nor anywhere on the web, about the junction light flashing or an error or anything.

Otherwise it all works and shifts fine. Strange! It also had been micro adjusting fine up until yesterday too.

Anyone had any similar problems?

Cheers,

Jim

6 comments

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dave atkinson [6258 posts] 2 years ago
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All of the front derailleur adjustments are mechanical, using the limit screws on the body of the unit.

Here's a helpful vid:

https://www.youtube.com/watch?v=PU2kQp9IeBc

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Cyclosis [73 posts] 2 years ago
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Hi Dave,

Thanks for the reply, but that video is for the 6700. I'm using the newer 6800 which does have electronic adjustment.

It was working fine until yesterday, now all I get is the flashing red light, which isn't mentioned in any of the documentation.

Jim

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movingtarget [144 posts] 2 years ago
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Don't know if you've already come across this but someone on one of the tri forums had probs getting his FD to micro adjust too. The OP didn't follow up so don't know how things turned out but they referred him to pages 57-58 in the Shimano manual for doing micro adjustments.

http://si.shimano.com/php/download.php?file=pdf/dm/DM-UL0001-00-ENG.pdf

Here's the tri forum thread too if that helps

http://www.forum.slowtwitch.com/forum/Slowtwitch_Forums_C1/Triathlon_For...

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Cyclosis [73 posts] 2 years ago
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Ah! That Tri forum one is a helpful link, thanks! I'll see if any of the advice there helps.

Cheers!

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wellcoordinated [209 posts] 2 years ago
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The battery needs charging? When the battery gets depleted only the rear derailleur works.

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M3IT [1 post] 3 months ago
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I know this page is old, but it was one of very few hits from a search about this problem, so I thought I'd post the solution (that I found by finally RTFMing) in case it helps someone else.

For Di2 front deraileur microadjustment, the adjustment entry mode (entered by holding the button on the junction box), has to be entered with the chain on both big cogs - both front and back.  Refer diagram from page 57 of the manual.