Fukuda Denshi DSL-8001, Operation Manual

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The battery LED does not light during battery charge.
Cause : The battery temperature is high.
Solution : For safety reasons, if the battery is charged in a repetitive manner,
its temperature will be high and the charging operation will be in a
standby mode until the battery temperature decreases. When the
battery temperature decreases, the charging operation will
automatically start.
The <Charge Battery> message is displayed.
Cause : Due to low battery condition, the operable time is less than 5
minutes.
Solution : Plug in the AC power cable.
The <Low Battery> message is displayed.
Cause : Due to low battery condition, the operable time is less than 15
minutes.
Solution : Plug in the AC power cable.
WARNING
The installation of the battery will be performed by our service
representative. Users should not perform this procedure as
electric shock may result to the patient and operator or
malfunction of the equipment may occur.
Operation
The <Night Mode Active> message is displayed.
Cause : The night mode is set.
Solution : Cancel the night mode.
The <Alarm Sound Suspend (xx)> message is displayed.
Cause : Alarm sound is suspended.
Solution : Press the [Alarm Silence] key for more than 3 seconds.
System
The <Battery Communication Error> message is displayed.
Cause : Communication error with the battery control circuit has occurred.
Solution : Reboot the equipment. If the same message is repeatedly displayed,
a failure of the equipment can be considered. Cease the
measurement and contact our service representative.
The <System Error (RTC)> message is displayed.
Cause : An error has occurred on the clock control circuit.
Solution : Reboot the equipment. If the same message is repeatedly displayed,
a failure of the equipment can be considered. Cease the
measurement and contact our service representative.