Dell OptiPlex GXa, Service Manual, Page: 44 / 181

1-32 Dell OptiPlex GXa and OptiPlex NX Systems Service Manual
OptiPlex NX Computer Power Supply
The OptiPlex NX computers have an 80-W computer power supply. The power
supply can operate from an AC power source of 115 VAC at 60 Hz or 230 VAC
at 50 Hz. The computer power supply provides the DC operating voltages and
currents listed in Table 1-5.
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 and hard-disk drive.
.
Table 1-5. OptiPlex NX DC Voltage Ranges
Voltage Range Maximum Output Current
1
+3.3 VDC +3.14 to +3.47 VDC
6.0 A
1
+5 VDC +4.75 to +5.25 VDC
12.0 A
1
+12 VDC +11.40 to +12.60 VDC
1.0 A
2
–12 VDC –10.80 to –13.20 VDC 0.5 A
+5 VFP
3 +4.75 to +5.25 VDC 1.2 A
1
The combined load on the +5-VDC and +3.3-VDC outputs should not exceed 65 W.
2
Withstands surges of up to 3.0 A to support disk start-up operations.
3
VFP (volts flea power) — sometimes called “standby power.”