Compaq 850 manual Power Distribution, 1 3.3/5/12 VDC Distribution, Conn Pin, Rtn, RTN Rsrtn

Technical Reference Guide

6.3POWER DISTRIBUTION

6.3.1 3.3/5/12 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. Figure 6-2 shows the power supply cabling for Deskpro EXS and Workstation 300 series units.

Power Supply

Assembly

(SP# 195196)

P6	P7							P7
P4	P5	To
		Drive					4	3	2	1
		Assemblies	P2-P6
	P2
										P3
	P3	1	2	3	4				2		1
		To							3		4
	P1	System
		Board					P1
		13 14 15 16 17 18 19 20 21 22 23 24
		1	2	3	4	5	6	7	8	9	10 11 12

Conn.

Pin 1

Pin 2

Pin 3

Pin 4

Pin 5

Pin 6

Pin 7

Pin 8

Pin 9

Pin 10

Pin 11

Pin 12

P1

+3.3

+3.3

RTN

+5

RTN

+5

AuxRtn

FO

+5 Aux

+12

+3.3Aux

FSpd

P1 [1]

+3.3

-12

Rtn

PS On

RTN

RSRTN

RTN

-3.3

+5

+5

+3.3RS

FS

P2, 4-7

+5

GND

GND

+12

P3

GND

GND

+12.8

+12.8

NOTES:

Connectors not shown to scale.

All + and - values are VDC. RTN = Return (signal ground) GND = Power ground

RS = Remote sense FO = Fan off FSpd = Fan speed FS = Fan Sink

[1] This row represents pins 13-24 of connector P1.

Figure 6–2. Power Cable Diagram

Compaq Deskpro EXS and Workstation 300 Personal Computers 6-5

Featuring the Intel Pentium 4 Processor

First Edition - December 2000