Replacing the power supply rear coupling
To remove the power supply rear coupling:
1. Follow the steps in “Removing the pullout tray” on page 37 to remove the
pullout tray completely from the unit frame.
2. Disconnect the internal power cable rear coupling from the power supply.
3. Remove the two screws holding the power cable rear coupling to the rear of the
pullout tray.
4. Pull from the rear of the pullout tray to remove the power cable rear coupling
from the unit.
To replace the power cable rear coupling, reverse the previous steps.
Replacing the system board
To remove the system board:
1. Disconnect all external device cables (I/O devices, audio, keyboard, and so
forth).
2. To remove the spline, along with its riser card and all adapters and I/O modules,
follow the steps in “Replacing the spline” on page 46.
Note: You do not have to remove the riser card, adapters, or I/O modules from
the spline to remove it from the system; you can skip those steps of that
procedure.
3. Follow the steps in “Replacing the DASD cage” on page 50 to remove the drive
cage, along with its riser card and all drives.
Note: You do not have to remove the riser card or drives from the DASD cage
to remove it from the system; you can skip those steps of that procedure.
4. Refer to "Installing memory modules" in the SurePOS 700 Series SurePOS
700-723/743/783/784 Systems, Installation, and Operations Guide, GA27-4998,
to remove the memory modules.
5. If necessary, follow the steps in “Replacing the heatsink and processor (Models
743, C43, E43, 783, E83, 784, C84, and E84 only)” on page 45 to remove the
processor fan, the heatsink, and the processor.
6. Follow the steps in “Replacing the power supply” on page 51 to remove the
power supply.
7. Note the cable routing, and then carefully disconnect the connectors on the
system board for the control switch card (Models 743, C43, E43, 783, E83, 784,
C84, and E84 only) and for the front USB module.
8. Lift the system board tray lever (A in Figure 38 on page 53) and pull towards
the front of the tray. The system board tray will slide off of its hooks on the
bottom of the pullout tray, which lets you remove the system board tray and
system board completely from the pullout tray.
52 SurePOS 700-723/743/783/784 Hardware Service Guide
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