Yamaha JW-II Service Manual page 41

Battery Charger
•
Diagnosing communication problems in the charger
•
If the battery cannot be charged because of a communication problem, the following causes
should be considered: 1 the charger, 2 the battery, and 3 the contact points. Follow the proce-
dure below to inspect the charger, battery, and contact points.
<Diagnosis procedure>
diagnosis
Can the capacity be
displayed for the battery
Are the contact points
deformed, or is there foreign
matter on them?
Can charging be
done on a normal
battery?
Charger has broken
Replace the charger
Start
alone?
YES
NO
NO
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Names and Functions of Parts
Has the current fuse
NO
blown?
Replace the fuse
Repair and clean the
YES
contact points
Battery control unit in
YES
the battery has broken
See the section on
diagnosing failures in the
battery control unit
38
NO
YES
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