9-16 SPARCclassic/SPARCclassic X/SPARCstation LX Service Manual • November 1993
9.2.1 Removing the Disk Drive Mounting Bracket
To remove the disk drive mounting bracket:
1. Prepare to work on the system as described in Chapter 6 “Power Off and On,” and
in Chapter 7 “Internal Access.
Halt the system and verify that the power LED is not lit and 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.
Caution – The AC power cord should remain attached between the system unit and
an AC wall outlet. This connection provides the ground path necessary to protect
internal system components from harmful static discharges. Inside the system unit,
be sure the power supply wiring harness is connected to the main logic board to
complete the ground.
Caution – Verify that the system power switch is in the Standby position. The green
LED at the front of the system unit should not be lit and the fan should not be
running. When the system power switch is in the Standby position, and the AC
power cord remains connected to a power outlet, hazardous AC voltage is still
present in the power supply primary. Do not attempt to service the power supply
under these conditions. Disconnect the AC power cord prior to handling the power
supply. When servicing any other system component, the AC power cord should
remain connected and poses no safety hazard.
2. Place an antistatic mat, shiny side up, next to the system unit.
3. Disconnect cables.
a. Free the power and diskette drive data cables (if present) from the cable
management guides located above the diskette drive (see
FIGURE 9-12).
b. Disconnect the power cable attached to the hard disk drive (see
FIGURE 9-12).
c. Disconnect the main logic power cable and the keyboard soft power-on cable
from the main logic board (see
FIGURE 9-12).
d. Disconnect the diskette drive data cable (if present) and the hard disk data
cable from their connectors on the main logic board (see
FIGURE 9-12).
Note – When pulling up the data cable’s pull tab, brace the main logic board near
the socket to minimize board flex.
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