Keysight Technologies N5247B, Service Manual

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7-46 Keysight N5247B Service Guide
Repair and Replacement Procedures
Removing and Replacing the A33–A36 Test Port Couplers
7-
Removing and Replacing the A33–A36 Test Port Couplers
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)
— 1 inch open-end torque wrench (set to 72 in-lb)
— ESD grounding wrist strap
Removal Procedure
Refer to Figure 7-22 for this procedure.
1. Disconnect the power cord.
2. Remove the front panel assembly. Refer to “Removing and Replacing the
Front Panel Assembly” on page 7-8 .
3. Position the analyzer bottom side up.
4. On 4-port models, it is necessary to remove the couplers in pairs: ports
1/3 and 2/4.
5. Disconnect two semirigid cables (item

) from each coupler to be
removed.
6. Disconnect the wire harness (item

) from the corresponding front panel
LED board and place it out of the way.
7. Remove the coupler nut (item

) from each coupler to be removed.
8. Move the disconnected semirigid cables out of the way and remove the
coupler(s) from the analyzer. 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.
Replacement Procedure
1. Reverse the order of the removal procedure.
Adhere a new gap pad (4-port) or coupler bumper (2-port) (item

) to the
new coupler in the same location as on the old one. If necessary, replace
the vibration mount (item

). Refer to “Bottom Hardware and
Miscellaneous Parts” on page 6-196 for replacement part numbers.
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.