3–16
DECbridge 500/600 Problem Solving
3.3.6.1
Removing the Backplane
To remove the backplane, refer to Figure 3–7 and follow these steps:
1. Remove the card cage from the bridge enclosure (Section 3.3.3.1).
2. Disengage the four modules from the backplane connector (Section 3.3.2.1).
3. Disengage the backplane connector from the power supply fingers and re-
move the backplane. (It is not necessary to unscrew and remove the power
supply.)
4. Remove the 10 screws that secure the backplane to the card cage. Place the
screws and backplane stiffeners nearby for use when replacing the backplane.
3.3.6.2
Replacing the Backplane
To replace the backplane, refer to Figure 3–7 and follow these steps:
1. Make sure that power is removed from the bridge and the interface cables are
disconnected (Section 3.2).
2. Make sure the ESD ground strap is attached.
3. Make sure the power supply is properly screwed in place. Then, engage the
backplane connector with the power supply fingers and snap it into place.
4. Align the screw holes in the replacement backplane with the corresponding
tapped holes in the card cage. Then, use the 10 screws and backplane stiffen-
ers saved from the removal procedure to attach the backplane in place. Insert
(but do not tighten) the two screws at the upper corners of the backplane first,
to align it. Then, insert the remaining eight screws. After inserting all 10
screws, tighten them all.
5. Reseat the four logic modules into the backplane connector by pushing the
locking levers of each module inward and tightening the quarter-turn fasten-
ers (Section 3.3.2.2).
6. Replace the card cage in the bridge enclosure and tighten the two quarter-turn
fasteners (Section 3.3.3.2).
7. Connect the interface cables (Figure 3–2 for proper installation locations).
