Figure 4-51 Shield Can Bottom Of The Check Source Assembly; Figure 4-52 Check Source Board (08990-66004) - Keysight 8990B Service Manual

4 Repair Guide
0515-2007
Figure 4-51
4 Detach the shield can bottom and remove the check source board
Figure 4-52
5 Take note on the connector orientation.
134
Shield can bottom of the check source assembly
(08990-66004) for replacement.
Check source board (08990-66004)
Keysight 8990B Service Guide