Audible alert on rear Dura-Ace mech

Jun 27, 2021
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I've notice in the last few weeks, the rear gear change occasionally not responding to a gear change "click". Last Sunday a clicking sound developed from the rear mech when clicking a gear change but no change was taking place. Then today I lost my rear gear change all together and was getting a louder audible alarm when pressing the rear gear shift. The alarm came on when I clicked to change up and switched off when I clicked to change down.

Any experience of this/ideas? I’ve had the battery on charge extensively but suspect it may not be charging properly. Would a low battery charge cause an alarm from the rear mech? The front mech was OK but that one is playing up similarly now as well.
 
Interesting. Thanks. How do I get it out of that mode if that is the issue? Martyn
Here's a video:

View: https://www.youtube.com/watch?v=rUkKqNN7HVI


The important part is that you spin the cranks while holding the button down (really they should have noted that first in the video) as it'll automatically cycle through the gears. I'm also unsure if this correlates with the FD causing you problems, but I think it's worth a check.
 
I’ve tried this but it didn’t work. I’m taking it into my bike shop tomorrow so will let you know what they say.
That's frustrating. Fingers crossed they can sort it for you without a large cost. I tried to open the user and dealer manuals on Shimano's website to see if they had a trouble-shooting page, but they wouldn't open for some reason.
 
Jun 27, 2021
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Yes, I tried the Shimano user guides also without success. Anyway, my man tested the battery this morning by plugging in a replacement unit and it worked perfectly so its not a battery issue. We looked at sending the mech back to Madison but they said it would be at least a week before they could look at it and even if they fixed it it wouldn't have a warranty. So, decided to bite bullet and replace it. They are hard to comedy at the moment but w've found one so will be fitted in next couple of days hopefully. The old one is coming up for six years old so I guess it hasn't done that badly.
 
That's not bad going for a Di2 RD, but still frustrating. You're lucky that it's something they can get hold of, bike parts, particularly drive-chain components, are in very short supply at the moment. And yeah, gotta keep that group consistent!
 

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