Models 840/Sb3 - System Unit Backplane (Mb1) And Regulator Board (Rb1) - IBM iSeries 270 Service Manual

6. Rotate the latches out.
7. Pull on both latches at the same time to remove the card from the slot.
8. Install the new SPCN card by reversing the removal procedure. After exchanging an item, go to "Verify
the repair" on page 558.
This ends the procedure.

Models 840/SB3 - System unit backplane (MB1) and regulator board (RB1)

For use by authorized service providers.
Use this procedure to remove or replace the system unit backplane (MB1) and regulator board (RB1) in
the Models 840 or SB3.
CAUTION:
The weight of this part or unit is between 18 and 32 kilograms (39.7 and 70.5 pounds). It takes two
persons to safely lift this part or unit. (RSFTC204)
To remove or replace the system unit backplane (MB1) and regulator board (RB1):
1. Print out a rack configuration sheet so that you know where all devices and cards are located in the
system rack.
2. Power off the system. (See "Power on/off the system and logical partitions" on page 561.)
3. Disconnect the power cord.
4. Remove the front and rear system covers. (See "Models 840/SB3 - Covers" on page 80.)
5. Refer to "Final assembly, front - Models 840 and SB3 Processor Tower" on page 411 and perform the
following steps from the front of the system:
a. Loosen the two thumbscrews on the control panel and swing out the control panel.
b. Disconnect the cables from the control panel assembly.
c. Remove the control panel assembly from the frame.
d. Remove the upper and lower front cage EMC access plates.
e. Remove the I/O tower panel cable from the right EMC bracket.
f. Remove the EMC brackets (first the top bracket, then the left and right) from around the front cage.
g. Mark the processor, memory, regulator, and filler cards and their locations in the front cage so you
can return the cards to their proper location during reassembly. Then remove the processor,
memory, regulator, and filler cards from the front cage.
6. Refer to "Final assembly, rear - Models 840 and SB3 Processor Tower" on page 414 perform the
following steps from the rear of the system:
a. Remove the upper and lower EMC access plates from the rear cage assembly.
b. Remove the EMC brackets (first the top bracket and then the left) from around the rear cage.
c. Remove the screws that attach the right side and bottom of the rear cage assembly to the frame.
d. Mark the SPCN card, regulators, memory, and filler cards and their locations in the top and bottom
of the rear cage so that you can return the cards to their proper locations during reassembly. Then
remove the SPCN card, regulators, memory, and filler cards from the top and bottom of the rear
cage.
e. Remove the mounting screws from the lower part of the rear cage.
f. Remove the two cable EMC access plates from the rear cage.
g. Remove the air baffle in the lower center of the rear cage.
h. Unplug the cables attached to the upper left and upper right corners of the front cage/backplane
assembly.
i. Remove the hex head screws that mount the rear cage to the front cage/backplane assembly.
j. Remove the rear cage assembly from the back of the system.
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Hardware (Remove and Replace; Part Locations and Listings)