Dell 200, 4100, 180 service manual System Unit, System Power Supply, DC Voltage Ranges

System 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.

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Table 1-1. DC Voltage Ranges

Voltage	Range	Maximum Output
		Current 1
+3.3 VDC	+3.135 to +3.465 VDC	15.0 A
+5 VDC	+4.90 to +5.25 VDC	50.0 A
+12 VDC	+11.40 to +12.60 VDC	25.0 A
–12 VDC	–10.80 to –13.20 VDC	0.3 A
–5 VDC	–4.50 to –5.50 VDC	0.3 A
+5 VFP 2	+4.85 to +5.36 VDC	0.25 A

1Maximum continuous DC output power shall not exceed 500 W.

2VFP (volts flea power) — sometimes called “standby power.”

System Overview 1-11