7-26 Service Guide E8361-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A14 System Motherboard E8361A
Removing and Replacing the A14 System Motherboard
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 7-11 for this procedure.
1. Disconnect the power cord.
2. Remove the outer and inner covers. Refer to “Removing the Covers” on page 7-6.
3. Remove the front panel assembly. Refer to “Removing and Replacing the Front Panel
Assembly” on page 7-10.
4. Remove the A12 source 20. Refer to “Removing and Replacing the A12 Source 20” on
page 7-22.
5. Remove the A13 (Option 080) frequency offset receiver assembly, if present. Refer to
“Removing and Replacing the A13 Frequency Offset Receiver Assembly” on page 7-24.
6. Remove the A11 phase lock board. Refer to “Removing and Replacing the A11 Phase
Lock Board” on page 7-20.
7. Remove the A4 power supply assembly. Refer to “Removing and Replacing the A4
Power Supply Assembly” on page 7-16.
8. Remove the card cage boards (A6, A8, and A10). Remove A9 (Option 080), if present.
Refer to “Removing and Replacing the A6, A8, A9, and A10 Boards” on page 7-18.
9. Remove the A15 CPU board. Refer to “Removing and Replacing the A15 CPU Board” on
page 7-28.
10.Remove the Midweb. Refer to “Removing and Replacing the Midweb and the B1 Fan” on
page 7-62.
11.Disconnect the A1 front panel ribbon cable (item
①), the A40 floppy disk drive ribbon
cable (item
②), the A16 test set motherboard ribbon cable (item ③), and the USB hub
assembly cable (item
④) from the A14 system motherboard.
12. Lift the tab at the rear of the A40 floppy disk drive enclosure and remove the rear
enclosure cover.
13. Remove the four screws (item 5) that secure the A14 system motherboard.
14. Lift the A14 system motherboard out of the analyzer.
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 7-66.
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