Dell Precision 400 Service Manual (.pdf) - Page 22

Computer Service, System Power Supply, Pin Assignments for the DC Power Connectors

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Computer Service The following subsections provide service-related information about the computer. System Power Supply The 230-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 condition. 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 Maximum Output Current1 +3.3 VDC +3.15 to +3.45 VDC 14.0 A +5 VDC +4.75 to +5.25 VDC 29.0 A +12 VDC +11.40 to +12.60 VDC 6.0 A -12 VDC -10.80 to -13.20 VDC 0.3 A -5 VDC -4.50 to -5.50 VDC 0.3 A +5 VFP2 +4.75 to +5.25 VDC 10 mA 1 Maximum continuous DC output power should not exceed 230 W. Maximum combined load on +5 VDC and +3.3 VDC cannot not exceed 170 W. 2 VFP (volts flea power) - sometimes called "standby power." . Pin Assignments for the DC Power Connectors 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. 1-10 Dell WorkStation 400 Systems Service Manual

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Dell WorkStation 400 Systems Service Manual
C
omputer Service
The following subsections provide service-related information about the
computer.
System Power Supply
The 230-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 system
board or drives.
.
.
Pin Assignments for the DC Power Connectors
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.
Table 1-1.
DC Voltage Ranges
Voltage
Range
Maximum Output
Current
1
+3.3 VDC
+3.15 to +3.45 VDC
14.0 A
+5 VDC
+4.75 to +5.25 VDC
29.0 A
+12 VDC
+11.40 to +12.60 VDC
6.0 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
10 mA
1
Maximum continuous DC output power should not exceed 230 W. Maximum combined
load on +5 VDC and +3.3 VDC cannot not exceed 170 W.
2
VFP (volts flea power) — sometimes called “standby power.”