Service manual

GS160/320 Component Removal and Replacement 4-41
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 boxes.
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 cover in place over the
distribution board assembly and remove the cover. The distribution board
is now exposed.
5. For each blue cable from top to bottom, release the cable from the plastic
cable-dressing clip.
6. Insert the blade end of a flathead screwdriver between the plastic cable
guide and the lip of the cable connector at one end of the connector and twist
one end of the cable connector loose
.
7. Repeat step 6 on the other end of the cable connector
.
8. Unplug the cable that connects to the CSB module
.
9. Disconnect the ground cable at the distribution board and move it out of the
way.
10. Unscrew the remaining nine Phillips head screws
that hold the module to
the housing.
11. Remove the distribution board.
Replacement
CAUTION: Be very careful when inserting the blue signal cables back into the
connectors on the new distribution board. Both the cable and
connector can be damaged easily.
Reverse the steps outlined in the removal procedure.
Verification
Power up and check that the distribution board works.
Be sure to put the circuit
breaker in the on position before you put the OCP switch in the On position.