Power Supply - Sun Microsystems SPARCstation 2 Service Manual

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Power Supply

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5. Turn the system unit's power on, and check for proper operation of the
system unit and the replaced SBus board.
See "How to Turn the Power Back On" at the end of this chapter.
The power supply is a self-contained metal assembly located just behind the
diskette drive (see Figure 4-9). The recess in the bottom of the chassis is for the
fan that is built into the power supply.
The power supply is held in place by two guides in the bottom of the chassis,
two tabs that mate with two slots in the bottom of the power supply, and a
screw. The screw is inserted through the rear bezel of the system unit.
A 12-pin power cable connects the power supply to the main logic board just
behind the power cable connector for the diskette drive.
Warning – Make sure that the system unit is unplugged from the AC power
outlet and the power switch is in the off position before you remove, replace, or
install the power supply in the system unit. Failure to take this precaution may
result in severe electrical shock
To remove the power supply follow these steps:
1. Read the parts of Chapter 3 about how to halt your system, tools needed,
removing expansion units, attaching a wrist strap, and removing the
system unit's cover.
2. Check that the green LED at the front of the chassis is not lit.
3. Check that the fans are not running.
4. Remove the power cord from the system unit.
5. Remove the screw from the back panel (Figure 4-9).
6. Disconnect the cable from the white 12-pin connector (J0701) on the main
logic board.
7. Grasp the power supply.
Slide it forward toward the front of the chassis and lift it out of the chassis.
SPARCstation 2 Field Service Manual—February 1991
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