Problem Location Procedure Using The Checker - Shimano SM-EC79 Service Instructions Manual

Using the checker
The two functions of this checker are to
determine locations of problems and to
change the switch directions.

Problem location procedure using the checker

Derailleur (front
derailleur or rear
derailleur) does
not operate
Problem with
derailleur operation
Problem with input
(SM-EW79A/ST-7970
lever) operation
Check the continuity
in the EW-7970.
NOTE:
This checker may not be possible to
determine the locations of some types of
problem.
Replace the
derailleur.
Check the
SM-EW79A.
Replace the
ST-7970 lever.
Replace the
EW-7970.
4
No problem
Problem
Replace the
SM-EW79A.