Service manual

GS80 Component Removal and Replacement 6-27
Removal
1. If the system is not partitioned, shut down the operating system, issue the SRM
power off command, put the OCP switch in the Off position, and trip the main circuit
breaker on the AC input box(s) at the rear of the system. Skip to step 4.
2. If the system is partitioned, from the console connected to the partition with the target
FRU, shut down the operating system and power it off using SRM power off.
3. Pull the 48V power supplies from the subrack powering the drawer with the FRU.
(This removes both 48V and Vaux from the target drawer only.)
4. Remove the I/O transition modules or I/O fillers from the drawer. See Section 6.7.
5. Remove the external CSB cable from the target CSB module.
6. To access the target drawer, follow the procedure in Section 6.1.1 or Section 6.1.2.
7. Remove the local I/O riser(s). See Section 6.6.
8. To remove the I/O transition module card guide:
• Remove the Phillips head screw holding the horizontal part of the I/O transition card
guide to the drawer.
• At the right side of the drawer, remove the Phillips head screw holding the right side of
the card guide to the side of the drawer. Access this screw by through the gap between
the open cabinet door and the cabinet frame.
• Lift the card guide out of the drawer.
9. Push the drawer back into the system, move to the rear, and using a 5mm or 3/16 inch
nut driver remove the posts on both sides of the external CSB cable connector.
10. Reach into the drawer through the hole left by the absence of the I/O transition cards
and disconnect the power cable and signal cable from the CSB module itself.
11. The two plastic standoffs used to hold the module to the drawer have tabs that clip the
top and bottom edges of the module to the standoffs. To free the module, push the top
tab up and the bottom tab down and release the module from the standoffs.
12. Once loose remove the module from the drawer.
Replacement
Reverse the steps of the removal procedure.
Verification
Power up the system. If you tripped the AC circuit breaker, be sure to put the circuit
breaker in the on position before you put the OCP keyswitch in the On position.