6-7 REMOVING AND
REPLACING THE A13,
A14, OR A15 PCB
This paragraph provides instructions for removing and replacing the
A13 YIG Driver PCB, the A14 SDM, SQM Driver PCB, or the A15
Regulator PCB, all of which are located in the main card cage (see Fig-
ure 6-3). Each of these PCB assemblies consists of a PCB and a PCB
Heat Sink subassembly.
Preliminary Disconnect the power cord from the unit and remove
the top cover as described in paragraph 6-2.
Procedure Remove and replace the A13, A14, or A15 PCB as
follows:
Step 1 Remove the main card cage cover and set
aside.
Step 2 Lift up on the edge tabs of the PCB and
lift it out of the card cage.
Step 3 Using a Phillips screwdriver,remove the
two screws that fasten the PCB Heat
Sink subassembly to the chassis pan.
Step 4 Lift the PCB Heat Sink subassembly out
of the card cage.
Step 5 Toreplace the PCB, reverse the removal
process.
6-8 REMOVING AND
REPLACING THE A16 OR
A17 PCB
This paragraph provides instructions for removing and replacing the
A16 CPU Interface PCB or the A17 CPU PCB, both of which are lo-
cated in the CPU housing assembly (see Figure 6-3).
Preliminary Disconnect the power cord from the unit and remove
the top cover as described in paragraph 6-2.
Procedure Remove and replace the A16 or A17 PCB as follows:
Step 1 Remove the CPU cover and set aside.
Step 2 Lift up on the edge tabs of the PCB and
lift it out of the CPU housing.
Step 3 Toreplace the PCB, reverse the removal
process.

682XXB/683XXB MM 6-11

REMOVAL AND A13, A14,

REPLACEMENT PROCEDURES OR A15 PCB