Check Source Board Module Disassembly; Figure 4-49 Detach The U-Wave Attenuator Pad - Keysight 8990B Service Manual

4 Repair Guide

Check Source Board Module Disassembly

Use this procedure to disassemble the check source board module.
1 Detach the U-wave attenuator pad (0955-0462) on the check source board
Figure 4-49
2 Unscrew the four screws (0515-0390) with the 18 in-lbs, T20 Torx screwdriver.
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assembly using the manual torque wrench (5/16") with torque of 5 in-lbs as
shown in Figure 4-49.
Detach the U-wave attenuator pad
Detach the belt cover with the poron pad (08990-00110) as shown in
Figure 4-50. Unscrew the four screws (0515-2007) with the
5 in-lbs, T8 Torx screwdriver and then remove the check source assembly
(08990-66004) from the PPMC assembly.
Keysight 8990B Service Guide