Power Distribution; 5/12 Vdc Distribution - Compaq EN Series Technical Reference Manual

7.3

POWER DISTRIBUTION

7.3.1

3.5/5/12 VDC DISTRIBUTION

The power supply assembly includes a multi-connector cable assembly that routes +3.3 VDC, +5
VDC, -5 VDC, +12 VC, and -12 VDC to the system board as well as to the individual drive
assemblies.
Power Supply
Assembly
(SP# 334112-001)
Connector Pin 1
P1 +3.3 +3.3RS
P1 [1] +3.3
P3-P5 +12
P6 +5
NOTES:
[1] This row represents pins 11-20 of the P1 connector.
All + and - values are VDC
RTN = Return (signal ground)
GND = Power ground
RS = Remote sense
= Deviation from ATX standard. PWR GD signal is produced by the south bridge component.
Figure 7–2. Power Cable Diagram
P6
P5
P3 P4
P2 P3
P1
Pin 2 Pin 3 Pin 4
RTN +5
-12 RTN PS On
GND GND +5
GND GND +12
.
Compaq Deskpro EN Series of Personal Computers
Third Edition - September 1998
Drive
Assemblies
11
Backplane
1
Board
Pin 5 Pin 6 Pin 7
RTN +5 RTN
RTN RSRTN RTN
Desktop and Minitower Form Factors
Technical Reference Guide
P6
4 3 2 1
P3-P5
1 2 3 4
P1 (ATX-type)
12 13 14 15 16 17 18 19 20
2 3 4 5 6 7 8 9 10
Pin 8 Pin 9 Pin 10
Fan Off +5AUX +12
-5 +5 +5
7-5