Keysight N5227A - Removing and Replacing the A60-A63 70 Ghz Doublers

7-44 Service Guide N5227-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A60–A63 70 GHz Doublers N5227A
Removing and Replacing the A60–A63 70 GHz Doublers
Tools Required
• T-10 TORX driver (torque to 9 in-lb or 1.02 N.m)
• T-20 TORX driver (torque to 21 in-lb or 2.38 N.m)
• 5/16 inch open-end torque wrench (torque to 10 in-lb or 1.13 N.m)
• ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-19 for this procedure.
CAUTION 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.
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
①
) connected to the 70 GHz doublers mounting bracket to be removed. For
4-port models, also remove the brace (item
➁) 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
③
) from each 70 GHz doubler on the mounting bracket to be
removed.
6. Disconnect the ribbon cable (item
④
) from each doubler.
7. Remove six screws (item
⑥
) 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
⑤
) 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.
Replacement Procedure
1. Reverse the order of the removal procedure.