Service manual

GS80 Component Removal and Replacement 6-23
Removal
1. Shut down the operating system(s).
2. Put the OCP switch in the Off position.
3. Follow the procedure in Section 6.1.1 to access the top drawer.
4. Remove CPU3 and memory 2 so that you have room to access the clock. If
you need more room, remove more modules. See Sections 6.2 and 6.3.
5. Remove the clock module cover plate in the rear left corner of the drawer
compartment by removing the two Phillips head screws holding it in place
and lifting it out of the drawer.
6. Remove the clock compartment shield. Note how the shield is installed.
7. Unplug the coax clock cable(s) from the dual-output clock module.
8. Unplug the power cable.
9. Unscrew the four Phillips head screws holding the module to the side of the
drawer and remove the module.
Replacement
Reverse the removal procedure.
Note: When replacing the clock compartment shield, twist the top back edge of
the shield to the left of the card guide as you slide the shield into place.
Verification
Power up the system.
Note: There is a spare clock module in the same location in the bottom drawer.
You may use it but you’ll have to separate the two drawers and remove
the dual-output clock module from the bottom drawer and move it to the
top.