Problem with Dura Ace di2 9070

pcfro

After a fall with my bicycle I realized that the rear derailleur doesn't work properly. Specifically when I tap the button once, it shifts the entire cassette one by one the cogs.
Any help?
Thanks in advance

paul2718

I think this may be related to the protection function, but I've never experienced it and it seems ill documented.

Try turning the transmission while pressing the button on the front junction box for more than 5s. Then if the red light stays on, press it again.

Paul

neal1984

Could be the crash protection mode as noted above. I think when I had to reset mine I had to push and hold the button on the junction box for 10 seconds. Google that and report back if that works.

pcfro

Thanks both of you paul2718 and Neal1984.
At the moment the deraileur is at shimano service center in Greece. Because I received a message that it cannot be repaired I tried to have other opinions.
I will transfer your advice and soon inform for the result
The main problem is that I was riding very slowly, nothing else happened in the bicycle and one of the most expensive parts of shimano was damaged. It is not good for shimano if this is true.
Thanks again for the immediate answer
Panagiotis

sloppyschleckonds

pcfro wrote:

The main problem is that I was riding very slowly, nothing else happened in the bicycle and one of the most expensive parts of shimano was damaged. It is not good for shimano if this is true.

Why is this not good for Shimano? Do you have to buy a replacement or will they replace it for free?

pcfro

I mean that a part with such a cost should be more tolerant. I wrote that I was riding very very slow. Nothing happened to me nor to the bicycle. The only part which was damaged (I hope not) is the derailleur.
Of course I was asked to buy a new one
P.S. The damaged one is less than 2 weeks in use

ugo.santalucia

As seen on TV... the same happened to Richard Hammond in St. Petersbourg, if I am not mistaken...

debeli

I have a cunning system on my bicycle (Camagnolo rather than Japanese) involving cables running from a ratchet-governed gear selector within the brake hoods and operated by a thumb button and a lever behind the brake lever on each end of the handlebar.

Could this system be adapted to fit your bicycle with a bit of bodging?

I must say, I've found it faultless over a number of years and easier to use when out of the saddle than the traditional downtube shifter.

I hope I have helped, but fear I may only have annoyed.

nferrar

A fall at low speed can be more damaging (to rider and bike) than at higher speed as all the force goes straight into the initial contact point, if you/your bike crash at higher speed then you often slide/bounce/roll which can reduce the impact on a specific point. I was quite impressed how Richie Porte's mech stood up to his crash in Paris-Nice, you can see it scraping down the road but he's able to get straight back on and continue without a bike change). That said one of the reasons I didn't stretch my budget to get Di2 on my main bike was I didn't want to be faced with big repair bills in the event of a crash.

DKay

ugo.santalucia wrote:

As seen on TV... the same happened to Richard Hammond in St. Petersbourg, if I am not mistaken...

Hammond's problem was a lot more obvious - he broke the rear mech hanger off.

DKay

pcfro wrote:

I mean that a part with such a cost should be more tolerant. I wrote that I was riding very very slow. Nothing happened to me nor to the bicycle. The only part which was damaged (I hope not) is the derailleur.
Of course I was asked to buy a new one
P.S. The damaged one is less than 2 weeks in use

The rear mech sticks out further than any other part at the rear of the bike, so it usually takes the brunt of any drive side crash. The fact you were riding slowly just means that you didn't scrape it along the floor, but the impact force wouldn't neccessarily be any less.

desweller

To be fair, this is the sort of failure that the mech hanger is supposed to prevent.

DKay

The thing is, Di2 rear mechs have a protection mode, which disengages the worm gear in the event of a crash to prevent damage to the motor. It also saves the mech hanger from breaking. Resetting it should just be a case of pressing the button on junction box A for a 5 seconds or more. If the connection is not restored, push/pull the cage sideways or move it forward and backward by hand. Operate the shifting switches to check that the connection has been restored.

pcfro

Thanks all of you for your time
The person who checked the deraileur told me that the motor doesn't work. I am waiting for an official answer.
It seems that the protection mode didn't work (my point of view)

Bar Shaker

The motor connects to a detachable end connection. It won't work until it is selected to come out of protection mode. If that hasn't been done it will not work.