3-18
Workstation 5 Field Service Guide
Workstation 5 Troubleshooting
Checking the Power Supply and System Board Voltages
o
VCC5
is available at Pin-4.
If both
VCC3
and
VCC5
are not present, but
PS_ON#
is low, suspect U38.
3. If
VCC3
and
VCC5
is available, you can check
VCC12
at Q22 pins 5 through
8. When VCC5 goes active, this enables the switch consisting of Q22 and
Q25, enabling
VCC12
.
4. Check
VCORE
at L3 and TC25. (Not shown in the illustration)
o
For System Boards with AMD ALXC800EETJCVD CPU, VCORE
should be +1.20V
o
For System Boards with the AMD ALXC800EEXJCVD CPU,
VCORE should be +1.25V.