Ac
,...
+5
+ 'f'
-12V
POWER
SUPPLY
@
fRONT
PAN
LED
EL
Telt_
Point.
I
LARGE
fAN
I
-
"7
MOTHERBOARD
I
SMAlL
fAN
I
.~
I/O
BACKPLANE
Figure
3-3.
Bus
Expander
Power
Distribution
Power supply
outputs
are
distributed
through
the
motherboard.
Test points for power measure-
ment
are located on
the
motherboard.
Power is connected from
the
motherboard
to
the
I/O
backplane via a ribbon cable. In
the
computer,
boards
in
the
system slots are powered directly from
the
motherboard.
Two fans are connected
to
motherboard
power connections.
The
large fan is
tied
to
the
+
12
and
ground.
The
small fan
is
tied between
+5
and
-12
V dc.
Wires from
the
front-panel LED are connected
to
the
+
12
and
-12
V dc voltages on
the
moth-
erboard.
CAUTION
When
custom
designed accessory
cards
are
being developed for
the
I/O
card
cage,
their
power consumption
must
not
exceed
the
power
available
at
the
backplane.
Information
regarding
the
design
of
custom
accessory
cards
is contained in
the
HP
9000 Series 200/300 Accessory
Development Guide,
HP
Part
Number
09800-90011.
42
Functional Description
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