Yamaha 4TX-AE1, Service Manual

Page: 115 / 332

3-56
Connect a charger and AMP
meter to the battery and start
charging.
Adjust the voltage so that the
current is at the standard charg-
ing level.
Set the timer according to the
charging time suitable for the
open-circuit voltage.
Refer to “Battery condition
checking steps.”
Set the charging voltage at 16 17 V.
(If the setting is lower, charging will be
insufficient. If too high, the battery will
be over-charged.)
Measure the open-circuit
voltage prior to charging.
Make sure that the current is
higher than the standard
charging current written on
the battery.
By turning the charging voltage
adjust dial, set the charging volt-
age at 20
25 V.
Monitor the amperage for 3 5
minutes to check if the standard
charging current is reached.
If the current does not exceed
the standard charging current
after 5 minutes, replace the
battery.
If charging requires more than 5 hours, it is advisable to check the charg-
ing current after a lapse of 5 hours. If there is any change in the amperage,
readjust the voltage to obtain the standard charging current.
Measure the battery open-circuit voltage after leaving the battery
unused for more than 30 minutes.
12.8 V or more --- Charging is complete.
R12.7 V or less --- Recharging is required.
Under 12.0 V --- Replace the battery.
YES NO
YES
NO
NOTE:
Voltage should be measured 30 min-
utes after the machine is stopped.
NOTE:
AMP meter
Charger
INSPECTION
INSP
ADJ
Charging method using a variable-current (voltage) type charger