Yamaha JW-II Service Manual page 40

Battery Charger
Function 6. Display function
<Lamp displays>
Preliminary charging in progress, temperature
standby
Fast charging in progress, follow-up charging
in progress
Charging completed, trickle charging in
progress
Refresh alert
Refresh in progress
Error display
Function 7. Error diagnosis function
Location of problem
Problem with
battery
Problem with
communication
Problem with Flash sequentially, in order of green, green,
charger (1) yellow
Problem with
charger (2)
Flash sequentially, in order of green, green,
(internal high
green, yellow
temperature
problem)
NOTE:
The charger is constructed so that it cannot be disassembled. If a problem occurs with the charger,
please consult the Service Center.
Charging in progress Refresh in progress
Green Yellow
Display
Flash simultaneously
Flash alternately
Names and Functions of Parts
Green lamp
Flashing
Lighted
Not Lighted
Not Lighted
Not Lighted
Various forms of flashing
(see the later section called "Error Diagnosis")
Replace the battery.
Replace the battery fuse.
Clean or repair the contact points.
Replace the battery.
Replace the charger.
Replace the charger.
Replace the charger.
Replace the cooling fan.
37
Yellow lamp
Not Lighted
Not Lighted
Not Lighted
Flashing
Lighted
Solution