Troubleshooting - Sun Microsystems Netra T4 AC100 Service And System Reference Manual

4
C H A P T E R

Troubleshooting

This chapter describes how to troubleshoot possible hardware problems and
suggests corrective actions.
This chapter contains the following topics:
Section 4.1, "Power-On Failure" on page 4-2
Section 4.2, "System LEDs" on page 4-2
Section 4.3, "Drive Failure" on page 4-2
Section 4.4, "Power Supply Unit Troubleshooting" on page 4-4
Section 4.5, "OpenBoot PROM Diagnostics" on page 4-7
Section 4.6, "OpenBoot Emergency Procedures" on page 4-30
Caution – Regardless of the position of the ON/STBY switch, when an AC power
cord remains connected to the system, hazardous voltage is always present within
the power supply.
Caution – Wear an antistatic wrist strap and use an ESD-protected mat when
!
handling components. When servicing or removing system unit components, use an
antistatic wrist strap with a 10 mm press stud connection and attach the antistatic
wrist strap to the press stud at the rear or front of the chassis before removing the
top access cover.
Caution – Owing to the weight of the unit, two persons are required to remove the
!
unit from and replace it in the rack.
4-1