Product data
5. Follow your local procedures and check the grounding of the 2104. Any test
equipment must be connected to the frame of the 2104 3.
v If the grounding is correct (see step 3a on page 31), go no further with these
instructions.
v If the grounding is not correct, unplug the power cables from the
fan-and-power-supply assemblies in the 2104.
If you are servicing a 220-volt 2104, go to step 6.
If you are servicing a −48 volt 2104, go to step 9.
6. Refer to Figure 17.
7. Check for continuity between the frame of the 2104 and the ground pin 1 of
the power connector on each fan-and-power-supply assembly.
8. Go to step 12.
9. Refer to Figure 18.
10. Check for continuity between the frame of the 2104 and the ground pins 1 and 7
of each mainline-power connector.
11. Go to step 12.
12. If any fan-and-power-supply assembly has no continuity, exchange that assembly
for a new one (see “Fan-and-Power-Supply Assemblies” on page 89), then do the
complete grounding check again.
Figure 17. Ground Pin (2104 Model DU3; 220 V)
Figure 18. Ground Pins (2104 Model DU3: −48 V)
Chapter 1. Reference Information 33