Sun Microsystems SPARC classic Service Manual page 78

1. Prepare to work on the system as described in Chapter 7 "Internal Access.
Halt the system and verify that the power LED is not lit and that the fan is not
running. Then open the system unit and attach a wrist strap as described in
Section 7.3 "Attaching the Wrist Strap" on page 7-3.
2. Make sure that the system unit's power is in the Standby position.
Make sure that the green LED at the front of the chassis is not lit and that the fan in
the power supply is not running.
3. Remove the disk drive mounting bracket.
The disk drive mounting bracket must be removed before the power supply can be
lifted out of the system unit. Follow the directions in Section 9.2.1 "Removing the
Disk Drive Mounting Bracket" on page 9-16 for removing the disk drive mounting
bracket (ignore step 1 and the Caution that follows it).
4. Make sure that you disconnected the power supply wiring harness from the
diskette drive, hard disk drive, and main logic board.
5. Disconnect the system unit AC power cord and detach the wrist strap from the
power supply.
For this procedure, the power cord must not bee connected between the system unit
and the AC wall outlet.
Caution – Make sure that the system unit is unplugged from the AC power outlet
and that the power switch is in the Standby position before you remove, replace, or
install the power supply. Failure to take this precaution may result in severe
electrical shock.
6. Remove the power supply (see
Grasp the power supply firmly and slide it about 0.25 inch toward the front of the
unit to disengage it from the four hooks in the bottom of the system unit. Lift the
power supply straight up and out. If the power supply does not lift easily, be sure
that it has cleared the hooks.
8-2 SPARCclassic/SPARCclassic X/SPARCstation LX Service Manual • November 1993
).
FIGURE 8-1