Use approved ESD procedures to prevent damage.


to identify the PPS being
repaired.
to identify the PPS being
repaired.
to the left of the gate and at the
bottom of the storage enclosure chassis might need to be removed to
allow the gate to swing open. Remove the two screws
that fasten the baffle to the 19"
rack mount vertical rails. If the baffle is the new level sheet metal,
it has a flexible plastic cutout that bends out of way when the gate
is swung open. 
and open the 208VDC bus bar gate
to the service position. See Figure 4. 
.
. 
securing the mainline power cable
to PPS-2 (lower PPS). Remove
the screw securing the mainline power cable bracket, and then remove
the mainline power cable bracket
. See Figure 6. 
PPS-to-PPS communication cable at
the bottom right of the PPS sequencer module (see Figure 7). 
PPS-to-PPS communication cable at
the bottom right of the PPS sequencer
module.
.
.
. See Figure 9.
. Then, lift the fan assembly up off
the two bottom positioning studs and remove it from the rack. One
or more of the PPS LEDs
may now be lit. 
and the PFC module
. See Figure 10.
from the PFC module.
securing the modules.
. See Figure 11. 


. Move the release lever down and then
slide
the module out. See Figure 15.
. Apply gentle pressure to move the
PPS assembly to the right until the sequencer module releases.




. See Figure 11.
and the PFC module
. See Figure 10.
from the PFC module.
.
. See Figure 9.
and
cables to the sequence module. 
Are any lit?
You can continue to complete the PPS replacement. After that is complete, isolate and repair the "failed diode" problem.
PPS-to-PPS communication cable and
the mainline power cord.
PPS-to-PPS communication cable at
the bottom right of the PPS sequencer
module.
PPS-to-PPS communication cable at
the bottom right of the PPS sequencer
module.