Keysight Technologies N5244/5B Service Manual page 614

Repair and Replacement Procedures
Removing and Replacing the A70 or A75 Low Frequency Extension (LFE) Board
Removing and Replacing the A70 or A75 Low Frequency Extension
(LFE) Board
Tools Required
– Four port PNAs use the A70 LFE board.
– Two port PNAs use the A75 LFE board.
The A70 LFE board RF flexible cable's connector labels on port 3 and port 4
connectors on the A70 LFE board are similar to the A75 LFE board's port 1
and port 2 connector labels.
— T-10 TORX driver (torque to 9 in-lb or 1.02 N.m)
— T-20 TORX driver (torque to 21 in-lb or 2.38 N.m)
— 5/16 inch open-end torque wrench (torque to 10 in-lb or 1.13 N.m)
— ESD grounding wrist strap
Removal Procedure
Refer to
page
procedure.
1. Disconnect the power cord.
2. Remove the outer cover. Refer to
3. Position the analyzer bottom side up.
4. Remove the A19 test set motherboard. Refer to
7-74
Figure 7-33 on page
7-77, Figure 7-36 on page
the A23 Test Set Motherboard" on page
7-75, Figure 7-34 on page
7-78, and Figure 7-37 on page 7-79
"Removing the Covers" on page
"Removing and Replacing
7-38.
Keysight N5244B/45B Service Guide
7-76, Figure 7-35 on
for this
7-8.