Shimano Ultegra R8050 Series Dealer's Manual page 130

ADJUSTMENT
Adjustment of the rear derailleur
SM-EW90-A/B
(B)
(A)
4
EW-RS910
(C)
To be continued on next page
Press the button at junction A until the
button LED illuminates in order to switch
from gear shifting mode to adjustment
mode.
(C)
(D)
(B)
(A)
(D)
130
(A)
Junction A
(B)
LED window for button
(C)
Button
(D)
Red LED
NOTE
Note that if you keep pressing the button
after the button LED has illuminated, RD
Protection Reset will begin.
TECH TIPS
For details on RD Protection, refer to "About
RD Protection Function" in the user's manual
for the rear derailleur (DI2).