Sun Microsystems SPARC classic Service Manual page 124

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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.
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 the antistatic mat, shiny side up, next to the system unit.
The mat is supplied with the replacement SBus card.
3. Detach any external cables connected to the faulty SBus card (if applicable).
4. Detach any internal cables leading from the SBus card to the main logic board (if
applicable).
Detach the cables from their connectors on the main logic board.
5. Remove the faulty SBus card.
Place your index fingers or thumbs beneath the corners of the SBus card where it
plugs into its slot. Lift up the card to release it from the slot (see
Caution – The plastic SBus card retainer is not a handle. Pulling on the SBus card
retainer can cause it to break.
6. Place the SBus card on an antistatic mat.
11-2
SPARCclassic/SPARCclassic X/SPARCstation LX Service Manual • November 1993
).
FIGURE 11-1

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