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If one of the SRC 12 Module attenuators is failing it must be replaced.


The following is the replacement procedure:

1) First turn off the system power, remove the small Phillips head screws from the front cover of the System RF Matrix.

2) Carefully disconnect any RF cables from the front and back of the module labeling each one as it is removed with tape. Then remove the small screws that hold the module in the rack and slide the module out the rear of the rack.

3) Locate the failed attenuator and carefully disconnect all of the cables labeling each one as it is removed with tape. Remove the mounting screws and lift it out of the Module.

4) Insert the replacement attenuator in place of the removed unit.

5) Carefully reassemble the RF cables and secure it by replacing its screws.
NOTE: Be careful when connecting the SMA end of the cable to the same point it was removed from. Use two wrenches, one to tighten the connector and the other to hold the small internal connector collar right where the cable enters the connector body.

6) Note the location and disconnect the DC cable going to the old attenuator and attach the new DC connector.

7) Slide the module in the rear of the rack being careful to align the module in the plastic guide rails.

8) Carefully reassemble the RF cables and secure the module by replacing its screws.
NOTE: Be careful when connecting the SMA end of the cable to the same point it was removed from. Utilize two wrenches, one to tighten the connector and the other to hold the small internal connector collar right where the cable enters the connector body.

9) Install the front cover of the System RF Matrix and secure it by replacing its screws.

10) Connect the power and perform the "System Setup" and "System Startup" procedures. Run the appropriate Source Diagnostic routines to check the integrity of the new attenuator. Then recalibrate the affected path.

Note: Contact Roos Instruments to report the failure and what work you performed.

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