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System Overview 1-9
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The following subsections provide service-related information about the
computer.
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The 330-W system power supply can operate from an AC power source of
115 VAC at 60 Hz or 230 VAC at 50 Hz. The system 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 sys-
tem board or drives.
.
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The power-supply output voltages can be measured at the back (wire side) of
the connectors without disconnecting them. Figures 1-6, 1-7, and 1-8 show the
wire side of the connectors.
+3.3 VDC +3.15 to +3.45 VDC 18.0 A
+5 VDC +4.75 to +5.25 VDC 35.0 A
+12 VDC +11.40 to +12.60 VDC 14.0 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
+4.75 to +5.25 VDC 1.2 A
1
Maximum continuous DC output power should not exceed 330 W. Maximum combined
load on +5 VDC and +3.3 VDC cannot exceed 200 W.
2
VFP (volts flea power) — sometimes called “standby power.”