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Chapter 7 Power and Signal Distribution
Compaq Deskpro 4000N and 4000S Personal Computers
First Edition - September 1997
7-6
7.4 SIGNAL DISTRIBUTION
Figure 7-4 shows general signal distribution between the main subassemblies of the system unit.
NOTES:
[1] Deskpro 4000S only
[2] No cable used for interface; direct connection between PS assembly and system board.
CD Models only. An audio card must be added by the user if audio is desired.
Figure 7–4
. Signal Distribution Diagram
System
Board
32-Bit PCI Bus
16-Bit ISA Bus
Riser Card
ISA Connector [1]
PCI Connector
+3.5, +/- 5,
+/- 12 VDC [2]
IDE I/F
IDE
Hard Drive
5, 12 VDC
Riser
Card
Conn
Power
Conn
IDE
Conn
IDE
Conn
IDE I/F
CD-ROM
Ke
y
board
Mouse
Dsk.
Conn
Dsk I/F
Diskette Drive
J4
P17
P20
P21
J1
J14
SW/LED
Conn
P16
Power On
HD Activity
PWR SW, PWR LED, HD LED
5, 12 VDC
5, 12 VDC
Mouse
Conn
Kybd
Conn
J13
Power
Supply
Assembly
Power Button