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Publication No.
500-9300007876-000
Rev. C.0
Power-up/Booting 33
4 • Power-up/Booting
4.1 Power Supply
For exact power supply values, see
For rough data, a current of up to 9.5 A at the 5 V rail and 3.5 A at the 3.3 V rail
must be taken into consideration for a basic XVR16 power on. (Typical values, and
does not include backplane termination power, or external drive power.) The
XVR16 does not use +/-12 V but they are provided to the PMC connectors for the
mezzanine which uses these voltages. If there are hard disk or PMC modules
attached to the XVR16, their power consumption must also be calculated.
Standard power supplies often require minimum loads on every supply voltage
for proper operation. It may be necessary to add a load to the +12 V to ensure
correct voltage levels on 3.3 V and 5 V.
If there are problems starting the board or doing resets at random states, check the
voltage of the two supply voltages at the backplane. Attach a standard digital
multimeter to the backplane at positions where no high current is flowing.
It is advisable to use rear contacts of the bus connectors or unused power
connectors for measuring. Measuring the voltages at the used power connectors
can result in wrong values which are caused by the high current flowing.
The 5 V and 3.3 V should reach their nominal value when measuring with a
multimeter. If the voltages are less than 5.0 V or 3.3 V, when the CPU or memory
perform intensively the voltage may drop causing the XVR16 to reset.
4.2 Setup
To enter the UEFI Firmware Setup, press the keyboard <DEL> or <F2> key at the
right moment. When using a slow starting monitor, it is advisable not to wait for
the CRT to show the message
ʹ
Press DEL to enter Setup
ʹ
. When using add-on
cards with external Option ROM
ʹ
s UEFI Firmware, press the DEL, F2 key while
their program runs.
If the right moment was missed to press the <DEL> or <F2> key, use the power
button on the front panel to restart the power up sequence or switch off the power
supply for a few seconds and restart it.
4.2.1 Clear CMOS/RTC/Password
NOTE
The BIOS has the capability of password protecting casual access to the unit’s CMOS setup screens.
Clearing the CMOS allows the user to clear the password in case of a forgotten password. This also
clears all CMOS settings and restores factory defaults.
To clear the CMOS password:
1. Turn off power to the unit.
2. Remove the board from the chassis.
3. Remove the onboard lithium battery for one minute. See