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Step 4
Turn the instrument over to return it to
the upright position.
Step 5
Lift the A4 PCB out of the RF housing.
Step 6
To replace the PCB, reverse the removal
process.
6-6
REMOVING AND
REPLACING THE A7 PCB
This paragraph provides instructions for removing and replacing the
A7 YIG Loop PCB, which is located in the main card cage (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 A7 PCB as follows:
Step 1
Remove the main card cage cover and set
aside.
Step 2
Using a
5
16
-inch wrench, disconnect coax-
ial cable W31 from the Sampler/SRD
module on the PCB.
Step 3
Disconnect the coaxial cables at A7J1 and
A7J5 by lifting up on the cable connec-
tors.
Step 4
Lift up on the edge tabs of the PCB and
lift it out of the card cage.
Step 5
To replace the A7 PCB, reverse the
removal process.
6-7
REMOVING AND
REPLACING THE A9, A10,
A11, OR A12 PCB
This paragraph provides instructions for removing and replacing the
A9 PIN Control PCB, the A10 ALC PCB, the A11 FM PCB, or the A12
Analog Instruction PCB, all of which are located in the main card cage
(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 A9, A10, A11, or A12 PCB
as follows:
Step 1
Remove the main card cage cover and set
aside.
Step 2
Disconnect any coaxial cables from the
PCB by lifting up on the cable connectors.
6-10
690XXB/691XXB MM
REMOVAL AND
REPLACEMENT PROCEDURES
A7 PCB
Summary of Contents for 680 C Series
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