DEC VAXmate Service Manual page 52

Troubleshooting the VAXmate Workstation
5. Remove all non-DIGITAL options in the expansion box then test the
power as follows.
a. Replace the bad fuse on the system unit.
b. Reattach the expansion box to the system unit.
c. Turn on the power.
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If the power stays on, then the problem is one of the non-DIGITAL
options or the option slot itself. Go to step 6. If there is still no power,
go to step 7.
6. Test the option slot as follows.
a. Remove the option from the suspected faulty slot.
b. Install the hard disk controller board into that slot.
c. Turn on the power.
If
the hard disk functions, then the slot is good.
Inform the customer that one of the non-DIGITAL options is causing
the problem.
NOTE
See Table 1-1, Electrical Description. The two option slots in the
expansion box can only accept industry-standard options that
require power of 9.5 watts/slot maximum and a clock frequency
of 8 megahertz. The slots use an industry-standard bus with 8 or
16 bits.
7. Try to restore power as follows.
a. Check the expansion box pins that connect to the system unit. Make
sure they are not damaged or touching each other.
If
they are dam-
aged or touching each other, fix them and test the power again. If
the power is present, go to step 11.
b. Unplug the hard disk cable from the power regulator board.
c. Test the power. If the power is present, replace the hard disk and go
to step 11.
d. Unplug the controller board.
e. Test the power. If the power is present, replace the controller board.
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