7-30 Service Guide E8361-90001
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A16 Test Set Motherboard E8361A
Removing and Replacing the A16 Test Set 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 7-13 for this procedure.
1. Disconnect the power cord.
2. Remove the outer covers. Refer to “Removing the Covers” on page 7-6. Position the
analyzer bottom side up and raise the receiver deck as shown. Refer to “Raising and
Removing the Receiver Deck” on page 7-8 if necessary.
3. Remove the A21 SOMA 50. Refer to “Removing and Replacing the A21 SOMA 50” on
page 7-40.
4. Remove the A41 hard disk drive and stationary board (shield). Refer to “Removing and
Replacing the A41 Hard Disk Drive” on page 7-56.
5. Disconnect the ribbon cables (item
①) from the A16 test set motherboard:
• A14 system motherboard ribbon cable
• A17 LOMA 12 ribbon cable
• A18 MA 24 ribbon cable
• A20 LODA ribbon cable
• A23 and A24 SOMA 70s ribbon cables
• A35 receiver motherboard ribbon cable
• Mixer bias board ribbon cable
6. Disconnect the wrapped-wire cables and flexible RF cables (item
②) from the A16 test
set motherboard:
• Front-panel LED board cable
• A22 switch cable
• A23 and A24 SOMA 70s flexible RF cables
7. Release the flexible RF cables from the cable clamp (item
③). Release the receiver deck
by pulling the latch pin (item
④), and move the entire receiver deck out of the way.
8. With a T-10 TORX driver, remove the following screws:
•Nine screws (item
⑤) from the rear panel.
•Four screws (item ⑥) from the A16 test set motherboard.
9. Slide the A16 test set motherboard toward the front of the instrument to release the
locking pins (item
⑦), then lift the motherboard and remove it from 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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