Removing And Replacing The A42-A45 Bias Tees - Keysight Technologies N5247B Service Manual

Repair and Replacement Procedures
Removing and Replacing the A42–A45 Bias Tees
Removing and Replacing the A42–A45 Bias Tees
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
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
3. Position the analyzer bottom side up.
4. The bias tees and the blocks to which they are attached, must be removed
5. Disconnect the wire harness cable (item
6. Remove two test set deck screws (item
7. Move the disconnected semirigid cables out of the way and remove the
8. Remove two screws from the bias tee in order to remove it from the bias
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Perform the post-repair adjustments, verifications, and performance tests
7-54
Figure 7-26 for this procedure.
as a complete assembly.
Disconnect four semirigid cables (item
removed.
removed.
bias tee block 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.
tee block.
Orient the position of the bias tees and block as shown in
Torque all cable connections to 10 in-lbs.
that pertain to this removal procedure. Refer to
"Removing the Covers" on page

) from the bias tee block to be

) from the bias tee.

) from the bias tee block to be
Table 7-2 on page
Keysight N5247B Service Guide
7-6.
Figure 7-27.
7-92.