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.
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