Power Supply Test - Sun Microsystems Ultra 1 Creator Series Service Manual

If one internal disk drive is configured with the system and the probe-scsi test
fails to show the device in the message, replace the drive. If the problem is still
evident after replacing the drive, replace the system board. If replacing both the disk
drive and the system board does not correct the problem, replace the internal disk
drive cable and SCSI backplane assembly.
4.4

Power Supply Test

The following provides instructions to test the power supply.
Note –
and
TABLE 4-3
Use a digital voltage meter (DVM) to check the power supply output voltages as
follows:
Note – Power supply connectors J2601 through J2603 must remain connected to the
system board.
a. With the negative probe of the VOM placed on a connector ground (Gnd) pin,
position the positive probe on each power pin.
b. Verify +12 VDC, -12 VDC, +5 VDC, +3.3 VDC and +3.0 VDC.
c. If any power pin signal is not present with the power supply active and
properly connected to the system board, replace the power supply.
4-4 Ultra 1 Creator Series Service Manual • August 1996
and
FIGURE 4-1 TABLE 4-2
identify power supply connector J2603.
identify power supply connector J2601.
FIGURE 4-2