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8
9
Grounding Check (Model 020 with −48 V Fan-and-Power-Supply
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Assemblies)
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1
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2
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3
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4
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1-64
7133 Service Guide
If any fan-and-power-supply assembly has no continuity, exchange that
fan-and-power-supply assembly for a new one (see "Fan-and-Power-Supply
Assemblies" on page 3-32), then do the complete grounding check again.
If each fan-and-power-supply assembly has continuity, you might have a problem
with the power cable or with the grounding of the using system.
Check the power cable for continuity.
If the power cable does not have continuity, exchange it for a new one, then do the
complete grounding check again.
If the power cable does have continuity, see the using-system Installation and
Service Guide to isolate the fault.
Ensure that all power is removed from the rack (see the Installation and Service
Guide for the using system).
Ensure that the power cables 1 and 2 are plugged into each
fan-and-power-supply assembly. Ensure also that the other ends of the power
cables are connected to the −48 volt supply in the rack.
Attention: Some electrical circuits could be damaged if the external SSA cables or
power-control cables are present at the 7133 while the grounding check is being
done.
Ensure that no external SSA cables are present at the eight connectors 3 .
If the 7133 has a Remote Power On Control feature, go to step 5 on page 1-65.
Otherwise, go to step 6 on page 1-65.
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