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6. Align the 50-pin male connector on the A6Al circuit card assembly with the 50-pin
female connector on the A6A2 circuit card assembly as shown in Figure 2-9. Mate
the two connectors.
7. Carefully place the two cards into the receiver chassis. Make certain the remote con-
trol interface connector (A6AIWIJl) clears the hole
iIi
the rear panel.
8. Position the two cards on the card guide attached to the receiver chassis. Secure the
cards with 6 screws (3 screws on each card) to the side of the chassis. -Secure the
interface connector to the rear panel with two screws. ·Figure 2-6 illustrates the two
cards installed -in the Receivers.
.
9. Reconnect the A9W1 cable assembly (removed in step 1) to connector A6A2J1.
NOTE
If the Receiver is to be equipped for operation in
the ISB mode, continue with the procedure described
in Paragraph 2.3.3.3. If the ISB option is not to be
installed, replace the top cover on the receiver chassis
and proceed to Paragraph 2.3.3.4, Line Level Adjustments.
2.3.3.3
Independent Sideband (ISB)
If the Receiver is to be operated in the ISB mode, the AS circuit card assembly must be
installed in the Receiver. The AS card is located towards the rear of the Receiver, between the Al
assembly and the A4 circuit card assembly as shown in Figure 2-6. The following procedure details
the steps necessary to install the AS circuit card assembly. Refer to Figures 2-5 and 2-6 for the
location of cables and connectors.
1.
Place the metal baseplate shield (curved edge upwards) on the four standoffs and
secure with four screws through the standoffs.
...,
Position the AS circuit card assembly so that the ribbon cable is near the J8 connec-
tor on the A4 circuit card assembly. Secure the AS circuit card assembly to the
metal baseplate with 4 screws.
3. Plug in the ribbon cable (A5WI) from the AS card into J8 on the A4 board. Con-
nect coaxial cable WIO between A4J6 and ASJ3. Connect coaxial cable Wll between
A413 and ASll.
4.
The mechanical jumper on the A4 circuit card assembly must be properly positioned
for ISB/SSB operation. The jumper, designated LKl, is physically located to the
right of fIlter position FLl when looking from the front of the Receiver. (Refer
to Figure
~-S.)
With the AS circuitassembly installed, the jumper must be connected
across the two terminals designated ISB ..
NOTE
Upon completing all required installation options procedures. it
is recommended that the Line Level Adjustment procedure be
performed as outlined in Paragraph 2.3.3.4. Upon completing
this adjustment procedure. the RA6790/GM Receiver Options
Installation Check as described in Section III, Paragraph 3.3.1
should be performed. After completing this operational check,
it is suggested that the System Connection be made in accordance
with the procedure listed in Paragraphs 2.3.4 through 2.3.4.6.
2-15
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