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

At the OBP ok prompt, type:
ok reset-all
ok probe-scsi-all
If the DVD-ROM drive responds correctly to probe-scsi-all, the message
identified in
successfully probed the device. This is an indication that the motherboard is
operating correctly. If the drive does not respond to the SCSI controller probe,
replace the unresponsive drive.
4.4

Power Supply Unit Troubleshooting

Caution – During the power supply voltage measurement checks, an operational
load must be on the power supply. Ensure that the power supply cables remain
connected to the motherboard.
The section describes how to use a digital volt meter (DVM) to test the power supply
under operational load. See the figures and tables in this section to identify the J3601
and J3603 power connectors.
1. Power off the system and remove the top access panel.
See Chapter 5 for details.
Caution – Use proper ESD grounding techniques when handling components. Wear
an antistatic wrist strap and use an ESD-protected mat. Store ESD-sensitive
components in antistatic bags before placing them on any surface. See Section 5.5,
"Antistatic Precautions" on page 5-5.
Caution – Hazardous voltages are present. To reduce the risk of electrical shock and
danger to personal health, follow the instructions.
2. Check the continuity of the power cables between the PDB and motherboard.
3. Ensure that the PSU is correctly located in the chassis and that the fixing screws
are fully tightened.
4-4 Netra T4 AC100/DC100 Service and System Reference Manual • August 2001
is displayed; the system SCSI controller has
CODE EXAMPLE 4-2