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Step 5. Disconnect the cables from connectors J1 and J2 of the
A21A2 Source Control PCB. (Pull up gently to disconnect.)
Note that the connector end of each cable is marked with
the associated A21A2 connector number.
Step 6. Disconnect the cable from connector J3** of the A21A2
Source Control PCB. Dress cables away from the Signal
Source Module.
Step 7. Remove the three screws that fasten the Signal Source
Module to the chassis side rail. See Figure 8-15.
Step 8. Loosen the two captive screws that fasten the Signal
Source Module to the chassis (Figure 8-15).
Step 9. Pull up at the rear of the Signal Source Module to discon
-
nect the A21A1 Source YIG Bias Control PCB from the A17
Motherboard PCB. Lift the module from the chassis and
place on work surface.
To replace the Signal Source Module, perform the steps above in the
reverse order.
SIGNAL SOURCE MODULES REMOVE AND REPLACE
8-30 373XXA MM
∗ W81 for Models 37269B
∗∗ Never operate unit with A21A2, J3 discon
-
nected. Refer to Caution statement on