Sun Microsystems SPARC classic X, Руководство по обслуживанию

Страница: 70 / 198

7-2 SPARCclassic/SPARCclassic X/SPARCstation LX Service Manual • November 1993
7.2 Opening the System Unit
Caution –
Before opening the system unit, make sure the system power switch is in
the Standby position. The green LED on 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; it poses no safety hazard.
To open the system unit and gain access to the CRUs inside it:
1. Make sure that the system power switch is in the Standby position.
The green LED on the front of the system unit should not be lit, and the fan should
not be running. Leave the AC power cord connected to both the system unit and
wall outlet.
2. Position the system on the table with the rear panel facing you.
Leave enough space to lay the unit top flat on the table behind the unit bottom.
3. Remove the screw that secures the lock block to the back panel (see
FIGURE 7-1
).
4. Grasp the unit top at its rear corners and carefully open the system unit like a
suitcase (see
FIGURE 7-1
).
Lay the unit top flat on the table behind the unit bottom. The unit top and bottom
are still connected by the power and data cables leading from the disk drive and
power supply to the main logic board.
Note –
The unit top contains the power supply and disk drive, and is the heavier of
the two sections.