Computer Service; Computer Power Supply; Table 1-1. Dc Voltage Ranges - Dell OptiPlex Gn Service Manual

C
omputer Service
The following subsections provide service-related information about the
computer.

Computer Power Supply

The low-profile computers have a 145-W computer power supply, whereas the
midsize and mini tower computers have a 200-W computer power supply. Both
computer power supplies 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 oper-
ating 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 Range
+3.3 VDC +3.15 to +3.45 VDC
+5 VDC +4.75 to +5.25 VDC
+12 VDC +11.40 to +12.60 VDC
–12 VDC –10.80 to –13.20 VDC
–5 VDC –4.50 to –5.50 VDC
3 +4.75 to +5.25 VDC
+5 VFP
1
The combined load on the +5-VDC and +3.3-VDC outputs should not exceed 105 W on
the low-profile computers or 140 W on the midsize and mini tower computers.
2
Withstands surges of up to 11.0 A to support disk start-up operations.
3
VFP (volts flea power) — sometimes called "standby power."
Maximum Output Current
1
12.0 A (low-profile computers)
1
14.0 A (midsize and mini tower
computers)
1
18.0 A (low-profile computers)
1
22.0 A (midsize and mini tower
computers)
2
3.0 A (low-profile computers)
2
6.0 A (midsize and mini tower
computers)
0.3 A (low-profile computers)
0.3 A (midsize and mini tower
computers)
0.3 A (low-profile computers)
0.3 A (midsize and mini tower
computers)
1.2 A
System Overview 1-13