Major Subassemblies; Power Supply; Removing The Power Supply - Sun Microsystems SPARCstation 4 Service Manual

8
C H A P T E R

Major Subassemblies

This chapter describes how to remove and replace the system unit's major
subassemblies.
"Power Supply" on page 1
"Speaker/LED Cable" on page 5
"Internal Speaker" on page 8
8.1

Power Supply

Caution – 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.
SPARC Xterminal 1 and SPARCstation 4 systems have a 50-watt power supply with
an unswitched AC accessory outlet. SPARCserver 4 systems have a 150-watt power
supply, with a switched AC accessory outlet.
8.1.1

Removing the Power Supply

Caution – To avoid damage to the system board or components, press the Standby
side of the AC power switch before disconnecting the external power cord from the
rear panel.
8-1