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Step 5. Remove the four screws that fastens the back plate of the
source module chassis to the heatsink of the A21A1 PCB.
Step 6. Place the Signal Source Module on its‘ back plate.
Step 7. Unfasten the six PCB retainers on the bottom of the A21A1
PCB. (To unfasten, turn screwdriver slot
1
4
turn coun
-
ter-clockwise.) Gently separate the A21A1 PCB (including
the heat sink) from the Signal Source Module.
To replace the A21A1 Source YIG Bias Control PCB assembly, perform
the steps above in the reverse order.
Switched Filter
Assembly
Use the following procedure to remove/replace the Switched Filter as
-
sembly.
Procedure:
Step 1. Disconnect the power cable from connector P1 at the rear of
the Switched Filter assembly. (Use a small screw driver to
pry up gently at each end of the connector, as necessary.)
Step 2. Disconnect the semi-rigid coaxial lines from connector J6
(top) and connector J3 (lower-front) of the Switched Filter
assembly.
Step 3. Disconnect the semi-rigid coaxial line from the RF INPUT
(top) connector of the Down Converter assembly.
Step 4. Remove the two screws that fasten the Switched Filter as-
sembly to the source module chassis and lift the assembly
from the Signal Source Module.
Step 5. Disconnect the semi-rigid coaxial line from connector J1
(bottom) of the Switched Filter assembly. Put this coaxial
line aside for re-use.
NOTE
When replacing the Switched Filter assembly, connect the
semi-rigid coaxial line to the bottom connector (J1), before
attaching the assembly to the Signal Source Module.
To replace the Switched Filter assembly, perform the steps above in
the reverse order.
Down Converter
Assembly
Use the following procedure to remove/replace the Down Converter
assembly.
Procedure:
Step 1. Disconnect the power cable from connector P1 at the front
of the Down Converter assembly.
REMOVE AND REPLACE SIGNAL SOURCE MODULES
373XXA MM 8-33