Keysight Technologies N5222B, Service Manual

Page: 205 / 226

Keysight N5290/1A Service Guide 7-29
Repair and Replacement Procedures
Removing and Replacing the Subpanel PCA Sensor Boards
Removing and Replacing the Subpanel PCA Sensor Boards
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
1. Disconnect the power cord.
2. Remove the outer covers. Refer to “Removing the Cover” on page 7-8 .
3. Remove the front panel. Refer to “Front Panel Assembly, Front Side, All
Options” on page 6-9 and “Front Panel Assembly, Back Side, All Options”
on page 6-13 .
4. Disconnect the power switch cable from the power switch board. Refer to
Figure 6-8 on page 6-16 and to Figure 6-9 on page 6-17 .
5. Remove the front panel and set aside test set. For the location of the
screws, see Figure 6-8 on page 6-16 .
6. Subpanel: Remove the cables for the port(s) that require the port sensor
PCA to be replaced by referring to “Removing and Replacing the Front
Panel and Subpanel Assemblies” on page 7-10 . See also “Front Panel
Assembly, Front Side, All Options” on page 6-9 and “Front Panel
Assembly, Back Side, All Options” on page 6-13 .
7. Remove the screw securing the port sensor PCA to the subpanel. Refer to
Figure 7-5 on page 7-13 .
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Perform the post-repair adjustments, verifications, and performance tests
that pertain to this removal procedure. Refer to Table 7-2 on page 7-36 .
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.