Dell OptiPlex Gs, Service Manual

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System Overview 1-9
C
omputer Service
The following subsections provide service-related information about the
computer.
System Power Supply
The low-profile computer has a 145-W system power supply, whereas the mid-
size computer has a 200-W system power supply. Both system power supplies
can operate from an AC power source of 115 VAC at 60 Hz or 230 VAC at
50 Hz. The system power supplies provide the DC operating voltages and cur-
rents listed in Table 1-1.
NOTE: Each system power supply produces DC voltages only under its loaded
condition. Therefore, when you measure these voltages, the DC power connec-
tors must be connected to their corresponding power input connectors on the
system board or drives.
.
Table 1-1. DC Voltage Ranges
Voltage Range
Maximum Output Current
1
+3.3 VDC +3.15 to +3.45 VDC
12.0 A
1
(low-profile computer)
14.0 A
1
(midsize computer)
+5 VDC +4.75 to +5.25 VDC
18.0 A
1
(low-profile computer)
22.0 A
1
(midsize computer)
+12 VDC +11.40 to +12.60 VDC
3.0 A
2
(low-profile computer)
6.0 A
2
(midsize computer)
–12 VDC –10.80 to –13.20 VDC 0.3 A
–5 VDC –4.50 to –5.50 VDC 0.3 A
+5 VFP
3 +4.75 to +5.25 VDC 10 mA
1
The combined load on the +5-VDC and +3.3-VDC outputs cannot exceed 105 W on the
low-profile computer or 140 W on the midsize computer.
2
Withstands surges of up to 11.0 A to support disk start-up operations.
3
VFP (volts flea power) — sometimes called “standby power.”