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Shimano SM-EC79 Service Instructions Manual page 7

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2.
Before a further 10 seconds have passed, press the shifting switch for the
ST-7970 lever.
If there is no problem, the judgment indicator (green) on the checker will
turn one. If the green indicator does not turn on when the switch is
pressed, check the SM-EW79A.
< For the left lever >
* If the switch is pressed and held, the battery LED of the SM-EW79A will illuminate
green. If no other operation is carried out for 30 seconds after the switch input, the
power will turn off automatically.
< For the right lever >
8
Illuminates green:
No problem

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