Service manual

GS160/320 Component Removal and Replacement 4-55
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(s).
3. In GS320 systems, skip to step 9.
4. In GS160 systems, remove both the upper and lower QBB faceplates. (See
Section 4.5.)
5. Unscrew the four captive screws that hold the upper and lower H-switch
EMI covers in place and remove both covers
.
6. On the left side of the H-switch housing, unscrew the three captive screws
holding the midpanel bracket to the H-switch and cabinet
. Remove.
7. Using a long Phillips head screwdriver threaded through the cabinet frame,
unscrew the four captive screws holding the H-switch housing on the right
to the cabinet’s inner frame
.
8. Swing the H-switch left
. Skip step 9.
9. Remove the faceplate on QBB 4. (See Section 4.5.)
10. Unscrew the two captive screws holding the lower right EMI cover to the H-
switch housing and pull it off
.
11. The console serial bus module is now exposed. Unplug the three cables from
the module: two internal cables and one external the H-switch housing
.
12. Remove the two Phillips head screws that hold the CSB module to the H-
switch internal frame
.
13. Using a small nutdriver remove the posts on both sides of the external cable
connector used to secure the cable to the connector
.
14. 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.