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H-2
ePCI-101 User’s Guide
If it does not work, contact your backplane vendor’s technical support.
With the latching pushbutton configuration, the control signals do not go through the SHB. If it
does not work, it is a backplane configuration problem. Consult your backplane documentation.
H.4 SHB Used in a Backplane With ATX Control
When in doubt, try the SHB and backplane in stand-alone non-ATX configuration (see section H.2)
to make sure they are both functional.
Set any backplane ATX configuration jumpers to “Controlled by SHB”.
Next, connect the push button the backplane. If it does not work, contact your backplane vendor’s
technical support.
H.4.1 Power Supply Does Not Stop (Softoff Does Not Work)
Make sure that there is no jumper on J2.
When you turn off the board, press the ATX pushbutton for a minimum of 4 seconds. Press the
pushbutton for up to 10 seconds to make sure board turns off.
H.4.2 Bad Behavior Following an AC loss
Following an AC loss, you can choose to leave the board off or put it in the state is was before the AC
loss (i.e. mimic a non-ATX power supply behavior).
This is a BIOS setup option in the Power Menu.
H.4.3 SHB Stuck in Reset
The following table gives possible causes that can keep the board in reset.
Possible Occurences Possible Fixes
Power supply does not assert its “PowerGood” signal.
Check Pin P1-B2 (second finger of first connector on
primary component side). You should see a voltage above
2.4V. If not, try another power supply.
One or more supply is too low.
Take a voltmeter and measure the following voltages on
the backside of the SHB, in the pins of its stand-alone
power connector:
+3.3V, +5V, +12V, +5Vsb. Those supplies should be within
5%.
Shorted reset switch.
Make sure Pin #13 of multi-function connector (J8) is not
grounded. Unplug any cable on J8 to be sure.