Keysight Technologies N5247B, Руководство по обслуживанию

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7-62 Keysight N5247B Service Guide
Repair and Replacement Procedures
Removing and Replacing the A60–A63 70 GHz Doublers
7-
Removing and Replacing the A60–A63 70 GHz Doublers
Tools Required
— T-10 TORX driver (set to 9 in-lb)
— T-20 TORX driver (set to 21 in-lb)
— 5/16-inch open-end torque wrench (set to 10 in-lb)
— ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-31 for this procedure.
1. Disconnect the power cord.
2. Remove the outer cover. Refer to “Removing the Covers” on page 7-6 .
3. Position the analyzer bottom side up.
4. Remove the brace (item

) connected to the 70 GHz doublers mounting
bracket to be removed. For 4-port models, also remove the brace (item

)
that partially covers the front cable bracket (for 4 semirigid cables).
5. The 70 GHz doublers and the mounting brackets to which they are
attached, must be removed as a complete assembly.
Disconnect all semirigid cables (item

) from each 70 GHz doubler on the
mounting bracket to be removed.
6. Disconnect the ribbon cable (item

) from each doubler.
7. Remove six screws (item

) that attach the doubler mounting bracket to
the test set deck.
8. Move the disconnected semirigid cables out of the way and lift the
doubler mounting bracket, with the two doublers attached, out of the
analyzer just enough to allow the gray flexible RF cables (item

) to be
disconnected. It may be necessary to loosen the connector at the other
end of some of the semirigid cables to allow them to be moved enough.
Note the locations of each of the gray flexible cables for reconnection
later. Disconnect these cables and remove the doubler mounting bracket,
with the two doublers attached, from the analyzer.
9. Remove three screws that attach the doubler to be replaced to its
mounting bracket, and remove the doubler from the bracket.
Be careful not to damage the center pins of the semirigid cables. Some
flexing of the cables is necessary to remove the assembly. However, do not
over-bend the semirigid cables.