Bull Cedoc Bull Escala 2104 TS4, Installation Manual

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3. Attention: Some electrical circuits could be damaged if the external SCSI
cables are connected to the 2104 Model TS4 while the grounding check is
being done.
Ensure that no external SCSI cables are connected at the SCSI connectors
2
.
See Figure 7 on page xvi.
4. Check for continuity between the chassis of the 2104 Model TS4
3
and the
ground pin of each power cable.
a. Check the power cables and ensure that the third-wire ground connector is
in good condition.
b. Use a meter to check that the third-wire ground continuity is 0.1 ohm or less
between the external ground pin and the chassis ground.
5. If the continuity is good, the grounding check is complete.
6. If the grounding is not correct, unplug the power cables from the mainline power
connectors.
a. Check each power cable for continuity.
b. If either power cable is failing, exchange it for a new one.
c. Check for continuity between the chassis of the 2104 Model TS4 and the
ground pin
1
of the power connector on each fan-and-power-supply
assembly. See Figure 8.
d. If either fan-and-power-supply assembly does not have continuity, exchange
that assembly for a new one. (See the section about fan and power supply
assemblies in
Expandable Storage Plus 2104 Model DS4 and Model TS4
Service Guide .)
Perform step 1 on page xvi through step 6d to complete the grounding
check again.
Figure 8. Ground pin (2104 Model TS4)
Safety and environmental notices
xvii