System Overview
1-7
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The 200-W power supply can operate from an AC power source of 115 VAC at
60 Hz or 230 VAC at 50 Hz. The power supply provides the DC operating volt-
ages and currents listed in Table 1-1.
NOTE: The power supply produces DC voltages only under its loaded
condition. The DC power cable connectors must be connected to their corre-
sponding power input connectors on the system board or drives in order to
measure these voltages.
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Figures 1-5 through 1-9 provide the following information about DC power
distribution:
Power-supply cable identification
Typical DC power connections for diskette, tape, CD-ROM, and hard-disk
drives
Power distribution to sockets and connectors on the system board
Pin assignments of DC power connectors
7DEOH '& 9ROWDJH 5DQJHV
9ROWDJH
5DQJH
0D[LPXP 2XWSXW &XUUHQW
+3.3 VDC
+3.14 to +3.47 VDC
14.00 A
1
+5 VDC
+4.90 to +5.25 VDC
22.00 A
1
–5 VDC
–4.50 to –5.50 VDC
0.300 A
+12 VDC
+11.40 to +12.60 VDC
6.00 A
2
–12 VDC
–10.80 to –13.20 VDC
0.300 A
+5 VSB
3
+4.75 to +5.25 VDC
0.010 A
1
The combined load on the +3.3-VDC and +5-VDC outputs cannot exceed 140 W.
2
The +12-VDC output line can withstand surges of up to 11.0 A to support disk start-up
operations.
3
The +5 VSB (volts standby) is sometimes called “flea power.”
