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 Post subject: Re:
PostPosted: Mon Aug 01, 2011 12:21 pm 
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in the industry
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Joined: Sun Nov 21, 2004 2:45 pm
Posts: 2669
Location: London, UK
laager wrote:
This is very interesting and I'm also curious as to the final diagnosis and resolution.

In the meantime, I'm going to go and give my 2011 SR a great big hug. :lol:

It is indeed! I wonder how much working around Campagnolo's existing patents compromised DI2's reliability?


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 Post subject: Re:
Posted: Mon Aug 01, 2011 12:21 pm 


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 Post subject: Re: Di2 RD Problem...
PostPosted: Mon Aug 01, 2011 10:53 pm 
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Joined: Thu Jan 25, 2007 3:56 pm
Posts: 775
Hey guys, apologies for not checking on this post for so long, I really appreciated the help I got trying to isolate this problem.

I ended up buying a new Di2 RD ASAP and replacing it. my Di2 on my road and TT bike has worked flawlessley aside from this problem which I think could have been caused by the crash. I think it may have just been bad luck when it did start malfunctioning 6 months after the crash, I have no way of telling how close it was to failing before this, maybe it was just a particular bike washing episode that allowed water in through a crack or damaged spot that had until then luckily avoided it :noidea:

It was expensive and I'll admit to being lazy when it comes to sending stuff in for warrenty work, but I ride my bike every day, and get most things (Shimano included) at trade price through a friend.

I don't know how common these problems are with Di2, I really enjoy using Di2 so this hasn't put me off.

In it's defence although the RD only had scuffs to it and I was able to ride an home without any adjustments to the RD I have no idea how hard it hit the road. I needed 18 stitches in my hip from the crash so it did better than me :thumbup:


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 Post subject: Re: Di2 RD Problem...
PostPosted: Thu Jul 05, 2012 7:56 am 
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Joined: Mon Oct 20, 2008 5:06 am
Posts: 74
Location: Minas Gerais, Brazil
one more here...

history: 2 years old external wired DA Di2 installed on a Scott Addict R2
bike used almost daily, 30-80mi/day (depending on training schedule)
for the last 30 days I haven´t cleaned it up and the bb area (and wires) is very very very dirty (dry mud, it´s been raining sometimes)
NEVER crashed

2 days ago I noticed something was wrong, it happened only 3-4 times and then continued to work fine
but today the problem showed up frequently and I could replicate it at home
I thought it could be the battery, but I charged it and the problem is still there

here´s what´s happening:
everytime I shift the RD, it moves the chain to the next sprocket correctly - BUT after a few seconds, the junction box blinks red twice and then the derailleur moves by itself again in the direction I had shifted before (up or down) - causing another (unwanted) shift...
my RD is ghost shifting...

as others have mentioned, I think I have a faulty RD too.
but isn´t it kinda "strange" that it´s happening after about 2 years of use - like with some other people who related the issue?

now let´s try to have it solved under warranty...

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Ride safe!
Eduardo
2011 Look 695 SR


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 Post subject: Re: Di2 RD Problem...
PostPosted: Thu Jul 05, 2012 9:13 am 
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Joined: Sun Oct 05, 2008 8:09 pm
Posts: 1188
Location: Aix en Provence
hum... I hope Shimano takes care of you quickly.


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 Post subject: Re: Di2 RD Problem...
PostPosted: Thu Jul 05, 2012 7:17 pm 
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Joined: Thu Feb 10, 2011 8:58 pm
Posts: 155
Try blowing out the connection at DR with compressed air. I had a riding buddy that had some rear DR issues and he had pulled the wire out when pulling it off a car rack and quickly pushed the wire back in before the ride. He didn't end up pressing the wire fully in and weeks later he had shifting issues. He inspected the DR to find moisture and dirt in the connection. It was cleaned with a q-tip and a bit of electronic connection cleaner and it works without issues again.


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 Post subject: Re: Di2 RD Problem...
PostPosted: Thu Jul 05, 2012 11:26 pm 
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Joined: Mon Oct 20, 2008 5:06 am
Posts: 74
Location: Minas Gerais, Brazil
thanks civdic, i will give it a try

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Eduardo
2011 Look 695 SR


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 Post subject: Re: Di2 RD Problem...
PostPosted: Wed Aug 08, 2012 11:42 am 
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Joined: Mon Oct 20, 2008 5:06 am
Posts: 74
Location: Minas Gerais, Brazil
here's a video of the malfunction:

http://www.youtube.com/watch?v=QrIY0hm2RBw&feature=plcp

Despite Shimano International says Dura Ace components have a 3-year warranty, Shimano Brasil refused to take care of the problem - and claimed that the warranty is for 1-year only... go figure...

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Ride safe!
Eduardo
2011 Look 695 SR


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 Post subject: Re: Di2 RD Problem...
PostPosted: Wed Aug 08, 2012 1:48 pm 
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Joined: Sat Dec 13, 2003 2:25 am
Posts: 4621
Location: Canada
Thanks for posting that video. We have heard lots of talk about the 'ghost' shifting, but that is the first time we have actually seen it. Have you sent that to Shimano in Japan?


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 Post subject: Re: Di2 RD Problem...
PostPosted: Wed Aug 08, 2012 1:52 pm 
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Joined: Mon Oct 20, 2008 5:06 am
Posts: 74
Location: Minas Gerais, Brazil
i couldn't find an email address from shimano japan to send them the link...

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Eduardo
2011 Look 695 SR


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 Post subject: Re: Di2 RD Problem...
PostPosted: Wed Aug 08, 2012 2:48 pm 
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Joined: Thu Mar 17, 2005 3:25 am
Posts: 2203
Location: Southern Indiana USA
Not only is it ghost shifting, but it seems a little slow on the shifts compared to other 7970 systems I have seen.

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 Post subject: Re: Di2 RD Problem...
PostPosted: Mon Jul 20, 2015 11:30 pm 
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Joined: Wed Mar 19, 2008 8:38 pm
Posts: 14
Just bought a DA 7970 group (via PayPal - goods or services) on Craigslist.

The seller said the front junction box was faulty. It arrived. I plugged it all in. SURPRISE!!

The rear derailleur is FUNKY!

The rear derailleur moves down (smaller cogs) 3 or 4 or 5 gears.. Then stops and inches down more.
If you shift up (bigger cogs) it goes 1 and stops. Then inches slowly to the top and the front junction blinks red 5 times.

It's FUBAR'd. He didn't think I would notice? He doesn't think PayPal will give me my money back?

I called Shimano USA (irvine california) and asked some basic questions. Their response it that it is broken and needs to be replaced. End of story. No warranty now that it's past 3 yrs old.

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Eric in San Mateo, CA


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 Post subject: Re: Di2 RD Problem...
PostPosted: Tue Jul 21, 2015 7:43 am 
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Joined: Fri Dec 12, 2008 5:19 am
Posts: 710
Location: Brisbane, Oz
I had 2 or 3 RD fail in this manor, and have heard of many others. I'm sure it would be fixable if you could get into the RD. Lucky I stockpiled a few spare RDs in the last year or so. :)


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 Post subject: Re: Di2 RD Problem...
PostPosted: Tue Jul 21, 2015 12:35 pm 
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Joined: Mon Dec 08, 2014 11:54 am
Posts: 55
egebhardt wrote:
Just bought a DA 7970 group

There's the first problem, you bought an obsolete groupset.

Quote:
junction box was faulty

Second problem. 7970 parts are very hard to find.

Just stay clear of it.


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 Post subject: Re: Di2 RD Problem...
PostPosted: Tue Jul 21, 2015 5:04 pm 
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Joined: Sat Jan 26, 2008 10:25 am
Posts: 298
Location: Cantabria
Johhny Bravo wrote:
here's a video of the malfunction:

http://www.youtube.com/watch?v=QrIY0hm2RBw&feature=plcp" onclick="window.open(this.href);return false;

Despite Shimano International says Dura Ace components have a 3-year warranty, Shimano Brasil refused to take care of the problem - and claimed that the warranty is for 1-year only... go figure...


Known problem. It happened to me with two different 7970 derailleurs, but I have seen more cases.

The most usual cause is the potentiometer used to check position of the derailleur givng a noisy signal.

There is no easy fix and Shimano will never accept a claim.


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 Post subject: Re: Di2 RD Problem...
Posted: Tue Jul 21, 2015 5:04 pm 


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 Post subject: Re: Di2 RD Problem...
PostPosted: Tue Jul 21, 2015 5:29 pm 
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Joined: Tue May 23, 2006 9:39 pm
Posts: 474
@ yourdaguy

also, don't forget to realign your RD hanger since you had a crash. that can wreck havoc as well down the road, so to speak.

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- AX Lightness Vial EVO D + DA9070 + Enve SES 4.5 CK hubs
- Parlee Z5 SLi + DA9070 + Enve 3.4 Tune/Dash hubs
- Parlee ESX + DA9070 + Enve SES 6.7 CK hubs
- Independent Fabrication Ti FLW + Campy SR11 + Enve 3.4 CK hubs


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