Input Section - HP 9000 Series 310 Service Information Manual

CAUTION
Before installing assemblies in the the computer or bus expander ac-
cessory card slots, ensure the total maximum power consumed by each
accessory and I/O card for each voltage does not exceed the power
available at each voltage for the backplane. If the accessory and I/O
cards installed require more power than is available, damage to the
accessory /1/0 card or computer/bus expander may result.
Figure 3-1 is a block diagram of the 0950-1760 power supply.
Commercial
Line
V Sel
bridge
~
~
+12V
~~
post reg.
Fuse
Input Section
rectifier ~--~
&
energy
storage
Transformer
Figure 3-1. Power Supply Block Diagram
+5V
+12V
-12V
- -
~
reset
t=
+5V
PURESET . 't
. circul ry + 12V
Ac line voltage is supplied to the input section through the power cord. Functions of the input
section are:
• High Frequency Filtering
• Fuse
• On-Off Switching
• Input Voltage Selection
• Low Frequency Filtering
38
Functional Description