Service Manual Chapter5. Power Supply
© 2013
Nautilus Hyosung Inc.
All Rights Reserved.
5-1
Overview
► The power supply unit converts AC power to DC power and provides that voltage to
various modules within the system. The power supply unit allows the user to turn on/off
the system, enter power-failure mode, and perform other sequences.
Functional Description
► LED and Switch Functions
1. [AC IN]: Illuminated when AC power is supplied to the assembly.
2. [DC OUT]: Illuminated when DC output is present.
3. [BATT ALM]: Illuminated when the battery voltage is 21V or less or when the battery
cable is disconnected.
4. [MAIN S/W]: Turns on or off the main power to the supply.
5. [STAND-BY S/W]: Turns on/off the system.
6. [BATT OFF]: Connects or disconnects the power supply unit with the battery. In the
normal state, set to “I” position.
► Switch Status
1.
[Main S/W] is pressed on “I” position
AC power is being supplied to the power supply unit, and only [AC IN] LED is turned
on.
2.
[Main S/W] is pressed on “O” position
AC power is not supplied to the power supply unit and all status LEDs are turned off.
3.
[STAND BY S/W] is pressed on “ON” position
The system is turned on and [AC IN] and [DC OUT] LEDs are turned on.
4.
[STAND BY S/W] is pressed on “OFF” position
<System Off> procedure starts (shut down) and only [AC IN] LED is turned on.
5. In case of a power failure during normal operation, the system will enter a <Power
Failure Mode> and only [DC OUT] will be turned off.
6.
[BATT OFF] S/W shall be pressed on “I”.
If [BATT OFF] S/W is pressed on “O” position, the system will not enter <Power
Failure Mode> and will be turned off.
