Blown Fuse Or Short Circuit - DEC VAXmate Service Manual

IIIII
Troubleshooting the VAXmate Workstation
3. If the power still fails, remove the non-DIGITAL options.
4. Check the options to make sure they meet DIGITAL electrical specifica-
tions for the industry-standard option slots (Chapter 1). If they do not
meet the DIGITAL specifications, tell the customer.
5. Turn on the power.
6. If the power still fails, replace the hard disk or hard disk controller.
7. Test the power.
If
it fails again, replace the power regulator.
2_3-4_3 Blown Fuse or Short Circuit
A fuse can blow when there is a power overload or short somewhere within
the system unit or expansion box. Each time you test the power in the follow-
ing steps, make sure to check the fuse and replace it if necessary; see Para-
graph 5.3.3. Correct the problem as follows.
1. Turn off the power switch. Let the V AXmate workstation cool for 15
seconds.
2. Turn on the power. If the power fails to come on, go to step 3.
NOTE
If the system unit power LED is on, but the expansion box LED is
off, go to step 5.
3.
If
no expansion box is present, go to step 8.
If an expansion box is present, separate it from the system unit. See
Chapter 5, FRU Replacement. Replace the system unit fuse if it is bad.
(There is no fuse on the expansion box).
4. Turn the system unit power on. If the power fails again, go to step 8.
The problem is in the system unit.
If the power stays on, however, the problem is in the expansion box.
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