Power Subsystem Block Diagram - DEC 4000 AXP Service Manual

Figure 6–9 Power Subsystem Block Diagram
System Backplane
Futurebus+
6 5 4 3 2 1
3.3 VDC
AC
FEU
Input
PSC
Fan
Power
Control
48 48
* 48 VDC BUS_DIRECT
Cooling Fans
Fixed-Media Devices
Removable-Media Devices
6–18 System Configuration and Setup
I/O
Memory CPU
3 2 1 0 0 1
12 VDC
5 VDC
5 3.3 12
DC5
DC3
Switched 48V
* Note: BUS_DIRECT is always energized
when AC power is present.
Storage Backplane
Disk
12 VDC
LDC
5 VDC Drives
5 VDC Vterm
Disk
12 VDC
LDC
5 VDC
Drives
5 VDC Vterm
Disk
12 VDC
LDC
5 VDC Drives
5 VDC Vterm
Disk
12 VDC
LDC
5 VDC Drives
5 VDC Vterm
Drive/s
Drive/s
LJ-02482-TI0