2. Open the rear cover to access the field replaceable unit (FRU). See “Models 870 and 890 - Covers” on
page 97.
3. Locate the DCA to be replaced by decoding the SRC (see the System reference codes topic).
4. Note the state of the DCA’s LEDs. Then, press the (green) Start Service button and only proceed if
both of the DCA’s LEDs are off, or the repair has been scheduled (System outage - EPO off).
5. Verify labeling and location, then unplug the cables from the DCA.
6. Loosen the upper and lower thumb screws using the torque tool (PN 6422789), alternating between
thumb screws (two upper, and two lower) until the unit can be slid out of the slot.
7. Grasp both sides of the DCA and pull it out of the drawer.
To replace the DC converter assembly (DCA):
1. Carefully slide the DCA into the slot as far as it will go. The back edge of the top of the DCA should be
approximately 0.25″ from the cage bracket.
Attention: In no instances should the unit be slammed or pushed vigorously against the backplane, as
this may damage the connector.
2. Hold the ’upper part’ of the DCA against the backplane, and using the torque tool (PN 6422789), start
the ’upper’ thumb screw into the matching hole in the cage bracket (approximately two turns).
3. Start the lower thumb screw (two turns).
4. Alternate tightening the upper and then the lower thumb screws until both are fully torqued in.
5. Check the torque on both thumb screws.
6. Plug all the cables into the DCA, ensuring correspondence of plug locations and cable labeling.
7. To indicate completion of these steps, press the (white) Service Complete button.
This ends the procedure.
Models 870 and 890 - L3 modules
For use by authorized service providers.
Use this procedure to remove or replace L3 modules on the Models 870 and 890.
Handling static-sensitive modules
Attention: L3 modules are sensitive to static electricity discharge. These devices are shipped in antistatic
containers to prevent damage caused by electrostatic discharge.
Take the following precautions:
v Use an antistatic wrist strap while handling the device.
v Do not remove the device from the antistatic container until you are ready to install the device in the
system unit.
v With the device still in its antistatic container, touch it to a metal frame of the system.
v Grasp modules by the heatsink. Avoid touching the interposer buttons.
v If you need to lay the device down while it is out of the antistatic container:
– Lay the L3s with the LGA connector down in the antistatic tray.
– Before picking it up again, touch the antistatic container and the metal frame of the system unit at
the same time.
v
Handle the devices carefully in order to prevent permanent damage.
Attention: Before you remove or replace any L3 module, STOP, read, and understand this entire
procedure. Also, check to ensure that the MCM/L3 Label Map is installed. Refer to Install the
MCM/L3/passthrough tri-fold plug map.
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