Technical data

7-34 Service Guide N5230-90025
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A19 MASS 26.5 (MASSQuad) and MASSQuad Mounting Block N5230C
Removing and Replacing the A19 MASS 26.5 (MASSQuad) and MASSQuad
Mounting Block
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 7-14 for this procedure.
1. Disconnect the power cord.
2. Remove the outer cover. Refer to “Removing the Covers” on page 7-6. Position the analyzer bottom side
up.
3. With a 5/16 inch wrench, disconnect the semirigid cables (item
①
) from the A19 MASSQuad.
4. Disconnect the flexible cables (item
➁), and the ribbon cable (item
③
) from the A19 MASSQuad.
5. With a T-10 TORX driver, remove the mounting screws (item
④
) from the A19 MASSQuad.
CAUTION Be careful not to damage the center pins of the semirigid cables. Some flexing of the cables
is necessary to remove the assembly. Do not over bend the semirigid cables.
6. Remove the A19 MASSQuad from the analyzer. Observe the
CAUTION above.
7. The MASSQuad mounting block can now be removed by removing the attachment screws (item
⑤
). It is
not necessary to remove the mounting block to replace the MASSQuad.
Replacement Procedure
1. Reverse the order of the removal procedure. If your analyzer contains the second source option (Options
146/246), there will be two 50-ohm loads attached to unused ports on the old A19 MASSQuad. Remove
these loads and install them on the new A19 MASSQuad before installing it in the analyzer.
Use the tools specified for all cable connections and mounting screws.
2. Perform the post-repair adjustments, verifications, and performance tests that pertain to this removal
procedure. Refer to Table 7-2 on page 7-58.