System Unit; System Power Supply - Dell 4100 Service Manual

S
ystem Unit
The following subsections provide service-related information about the system
unit.

System Power Supply

The 500-W system power supply can operate from an AC power source of 90 to
265 VAC at 50 or 60 Hz. When the power-supply paralleling board is installed,
the power supplies are hot-pluggable. When the red LED on the power supply is
lit (except during power-up), it indicates that the power supply has failed (see
Figure 1-5). When the green LED is lit, it indicates that +5 VDC is on. The sys-
tem power supply provides the DC operating voltages and currents listed in
Table 1-1.
NOTE: The power supply produces DC voltages only under its loaded condi-
tion. Therefore, when you measure these voltages, the DC power connectors
must be connected to their corresponding power input connectors on the system
board or drives.
.
Table 1-1. DC Voltage Ranges
Voltage
+3.3 VDC
+5 VDC
+12 VDC
–12 VDC
–5 VDC
2
+5 VFP
1
Maximum continuous DC output power shall not exceed 500 W.
2
VFP (volts flea power) — sometimes called "standby power."
Range
+3.135 to +3.465 VDC
+4.90 to +5.25 VDC
+11.40 to +12.60 VDC
–10.80 to –13.20 VDC
–4.50 to –5.50 VDC
+4.85 to +5.36 VDC
Maximum Output
1
Current
15.0 A
50.0 A
25.0 A
0.3 A
0.3 A
0.25 A
System Overview 1-11