Figure 1-6. Dc Power Connector P1; Figure 1-7. Dc Power Connectors P2, P3, P4, P5, P6, And P9 - Dell Precision 400 Service Manual

–5 VDC (white)
common (black)
common (black)
common (black)
1
PSON# (gray)
11
P1
1
+5 VDC (red)
common (black)
+5 VDC (red)
common (black)
3
PWRGOOD (orange)
1
Pin 11 — PSON# should measure between +4 and +5 VDC except when the power button
on the front panel is pressed, taking PSON# to its active-low state.
2
Pin 19 — Thermal fan-speed control (TFSC) is a power-supply input signal used to control
power-supply fan speed in special applications.
3
Pin 5 — PWRGOOD should measure between +4 and +5 VDC when the power supply is
operating to indicate that all power-supply output voltages are within the ranges specified
in Table 1-1.

Figure 1-6. DC Power Connector P1

P2, P3, P5,
P6, P9
1 2 3 4

Figure 1-7. DC Power Connectors P2, P3, P4, P5, P6, and P9

12 13 14 15 16 17 18 19 20
2 3 4 5 6 7 8
P4
+5 VDC (red)
common (black)
common (black)
+12 VDC (yellow)
+5 VDC (red)
+5 VDC (red)
+5 VDC (red)
2
TFSC (brown)
+5 VDC (red)
9 10
common (black)
common (black)
–12 VDC (blue)
+12 VDC (yellow)
+5 VFP (purple)
1 2 3 4
+12 VDC (yellow)
common (black)
common (black)
+5 VDC (red)
System Overview 1-11