I had a weird Di2 (Ultegra 11-speed, internal battery, TT setup) problem that I couldn't figure out for weeks. The FD works flawlessly. The RD worked perfectly for 1 ride, and then stopped working at home for some reasons. The ride was 2hr without rain, no crash, etc.
I connected this to the e-tube software through the BCR1 charger with brand-new wires. With elimination, I finally narrow down to this repeatable observation:
Connection check detects the RD if:
RD-6870ss -----EW90B 5-port junction (to PC)
Connection check does NOT detect the RD if I include the battery:
RD-6870ss -----EW90B 5-port junction (to PC) ---BTR2 internal battery
First I thought perhaps the RD being stuck in recovery mode when powered up. I bought a new one and it's still the same behavior. Then, I bought new cables and junction box, and it did help @#$!
Have anyone experienced similar behavior and how did you resolve it? I have IMLP coming up in 3 weeks, and I'm contemplating going back to mechanical shifting for now.
Or.. buy another battery an continue this $$$ adventure.... Thanks.
More details:
If I press the junction box button, the adjustment (RED) LED wouldn't light up (It worked before), I later learn that this is the case if the junction box doesn't detect the RD. The battery, junction box and shifters look to be working, since when I press any shifter buttons, the junction box gives solid green (the other LED) for the battery level. If I disconnect and reconnect the battery, the junction box adjustment (RED) LED may light up for a few minutes and then ease working. Even if it light up, button presses didn't move the RD.
I connected this to the e-tube software through the BCR1 charger with brand-new wires. With elimination, I finally narrow down to this repeatable observation:
Connection check detects the RD if:
RD-6870ss -----EW90B 5-port junction (to PC)
Connection check does NOT detect the RD if I include the battery:
RD-6870ss -----EW90B 5-port junction (to PC) ---BTR2 internal battery
First I thought perhaps the RD being stuck in recovery mode when powered up. I bought a new one and it's still the same behavior. Then, I bought new cables and junction box, and it did help @#$!
Have anyone experienced similar behavior and how did you resolve it? I have IMLP coming up in 3 weeks, and I'm contemplating going back to mechanical shifting for now.
Or.. buy another battery an continue this $$$ adventure.... Thanks.
More details:
If I press the junction box button, the adjustment (RED) LED wouldn't light up (It worked before), I later learn that this is the case if the junction box doesn't detect the RD. The battery, junction box and shifters look to be working, since when I press any shifter buttons, the junction box gives solid green (the other LED) for the battery level. If I disconnect and reconnect the battery, the junction box adjustment (RED) LED may light up for a few minutes and then ease working. Even if it light up, button presses didn't move the RD.