Shimano SM-EC79 Service Instructions Manual page 5

3.
Disconnect the connector for the rear
derailleur (front derailleur). Insert the
derailleur connector of the checker into the
rear derailleur (front derailleur).
4.
Press the ENTER switch on the checker. The check will
start automatically and the judgment will be given.
* To try actual operation, press the ENTER switch several
times while turning the crank arm.
No problem
• If the judgment indicator (green)
turns on
Problem
- - - - Replace the derailleur.
• If the judgment indicator (red) turns on
• If the judgment indicator (green) turns
on, and then after 1 or 2 seconds the
judgment indicator (red) flashes
• If there is no reaction from the
derailleur after 10 seconds from ENTER
switch input and the orange indicator
turns on, and the judgment indicators
turn off after 10 seconds
6
Illuminates green:
No problem
Illuminates red:
Problem
Illuminates green
and flashes red:
Problem
Illuminates orange,
then turn off after
10 seconds:
Problem