Service manual

GS160/320 Component Removal and Replacement 4-43
Removal
1. Shut down the operating system(s), put the OCP switch in the Off position,
and trip the main circuit breaker on the AC input box.
2. Open the rear door.
3. Remove the faceplate on QBB0. (See Section 4.5.)
4. Unscrew the two captive screws that hold the EMI covers in place over the
distribution board assembly and remove the cover. The dual-output clock
module is now exposed.
5. Unplug the two coax clock cables.
6. Unplug the power cable.
7. Unscrew the four Phillips head screws that hold the module to the
distribution board housing.
8. Remove the module.
Replacement
Reverse the steps outlined in the removal procedure.
Verification
Power up and boot the system.
Be sure to put the circuit breaker in the on position
before you put the OCP switch in the On position.