11-4 SPARCclassic/SPARCclassic X/SPARCstation LX Service Manual • November 1993
11.1.2 Replacing SBus Cards
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.
To install a replacement SBus card in the system unit:
1. Remove the faulty SBus card.
See Section 11.1.1 “Removing SBus Cards” on page 11-1. Make sure you use the wrist
strap and antistatic mat. Be sure to remember which slot contained the faulty SBus
card.
2. Read the manual supplied with the replacement SBus card.
Pay particular attention to the section describing the jumper or switch settings, slot
requirements, and tools needed.
3. Remove the replacement card from its antistatic bag. Hold the card by the edges.
Place the SBus card on an antistatic surface (either an antistatic mat or the antistatic
bag in which the card was shipped).
4. If required, set the jumpers or switches on the card.
Refer to the manual supplied with the replacement SBus card.
5. Align the mounting plate of the new SBus card with the rectangular opening in
the system unit’s back panel (see
FIGURE 11-3 and FIGURE 11-4).
Position the card in the same location that the faulty card occupied. Insert the two
locating tabs on the card’s mounting plate into the slots above the rectangular
opening in the back panel.
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