Yamaha UMAX, Service Manual

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ELECTRICAL COMPONENTS (YUM2E)
8-70
Troubleshooting
1. LED Error Codes (For Battery Condition)
WARNING
Incorrect reassembly may result in a risk of electric shock or fire. The following procedures are
intended only to determine if a malfunction may exist in the charger.
WARNING
To reduce the risk of electric shock, always disconnect the charger’s AC cord set plug from AC
power and its DC cord set plug from batteries before attempting any maintenance or cleaning.
WARNING
Do not operate the charger if it is malfunctioning. Personal injury or property damage could re-
sult.
If a fault occurs, count the number of red flashes between pauses and refer to the table below:
WARNING
Have qualified service technician inspect if problems persist.
2. Hardware System Faults
Red Flashes Cause Solution
Battery High Voltage Check battery size and condition and reset
charger (interrupt DC connection for 15
seconds).
Battery Low Voltage Check battery size and condition and reset
charger (interrupt DC connection for 15
seconds).
Charge Time-out caused by battery pack
not reaching required voltage. Check connections.
Charger output was reduced due to high
temperatures. Operate charger at a lower ambient tem-
perature.
Check Battery:
Battery could not be trickle charged up to
minimum voltage. Check for shorted or damaged cells.
Over-Temperature:
Charger shut down due to high internal
temperature. Ensure sufficient cooling airflow and reset
charger (interrupt DC connection for 15
seconds).
Charger Internal Fault Reset charger (interrupt AC power for 15
seconds). Return to qualified service de-
pot if fault persists.
Problem Description Cause Remedy
Charger does not start.
No LEDs illuminate or blink when
AC cord is connected. No AC power to charger. Ensure correct voltage at AC out-
let. Check AC cord connections.
Replace AC cord if damaged.