Question about Cycling
I have a FERRARI bike CX70 with the team Shimano NEXUS DI2, but does not work, you can also charge the battery and i do not have the user manual.
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Posted on Jan 02, 2017
It is apparently critical for the success of the pairing operation that initial power-up of the component to be paired be done cleanly, with little or no contact bounce when the battery is inserted. Since this is done with low power high frequency radio signals, interference and reflections can be an issue. If you have extraneous gear such as metal water bottle brackets mounted near the system controller / battery pack, remove it for this operation. Do not let anyone play with R/C toys within 30 feet while you are doing the pairing, and turn off Bluetooth devices to be really sure.
The graphics shown in the SC-7900 supplemental manual imply that the right and left shift levers are separate devices, but they are powered from the same battery and connected to the system at a single point. While Shimano's online documentation on this is rather sparse, the Di2 7900 system description says the system logic and communication circuits are inside the front derailleur. I do not expect step 6 will be needed. If you go through step 6 and it doesn't work you may need to disconnect the shift levers individually and try again. Once a device is paired, you should not have to disconnect it or remove power from it to continue the process with other devices.
If none of this works to pair your shifting system with the SC-7900, then the wireless circuitry in the shift system is defective (as I mentioned previously, this is probably in the front derailleur). Even if it is out of warranty, you may be able to get a warranty replacement since it is a newly discovered defect that could have existed from the factory. You will probably have to talk directly to the Shimano service department for this.
Posted on Jun 11, 2011
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