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Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
7-1
Drives
110/220 VAC
Chapter 7
POWER and SIGNAL
DISTRIBUTION
7.
Chapter 7 POWER SUPPLY AND DISTRIBUTION
7.1
INTRODUCTION
This chapter describes the power supply and method of general power and signal distribution in
the Compaq Deskpro INDY Personal Computer. Topics covered in this chapter include:
♦
Power supply assembly/control (7.2) page 7-1
♦
Power distribution (7.3) page 7-5
♦
Signal distribution (7.4) page 7-7
7.2
POWER SUPPLY ASSEMBLY/CONTROL
This system features a power supply assembly that is controlled through programmable logic
(Figure 7-1).
NOTE:
All signals shown entering and exiting the system board pass through the backplane card.
Figure 7–1.
Power Distribution and Control, Block Diagram
Power Supply
Assembly
+5 VDC
-5 VDC
+12 VDC
-12 VDC
+5 AUX
Slots, Chipsets, Logic
& Voltage Regulators
PS
On
Fan
Off
+3.3 VDC
System Board
Power On/Off
Front Bezel
Power On