Service manual

GS160/320 Component Removal and Replacement 4-45
Removal
1. Shut down the operating system(s), put the OCP switch in the Off position,
and trip the main circuit breaker on all AC input boxes.
2. Open the rear door.
3. Remove the lower QBB faceplate. (See Section 4.5.)
4. Unscrew the two captive screws that hold the EMI cover in place over the
distribution board assembly and remove the cover. The console serial bus
module is now exposed
.
5. Unplug the three cables from the module: two internal cables,
and , and
one external to the distribution board housing
.
6. Unscrew the two Phillips head screws that hold the CSB module to the H-
switch internal frame.
7. Using a 5mm of 3/16 nut driver, unscrew the posts
on both sides of the
external cable connector used to secure the cable to the connector.
8. Remove the CSB module.
Replacement
Reverse the steps outlined in the removal procedure.
Verification
Power up the system.
Be sure to put the circuit breaker in the on position before you
put the OCP switch in the On position.
If the CSB is not working, the system will
not power up.