7-60 Service Guide E8364-90038
Repair and Replacement Procedures PNA Series Microwave Network Analyzers
Removing and Replacing the A38 and A39 Bias Tees (Option UNL) E8362C, E8363C, E8364C
Removing and Replacing the A38 and A39 Bias Tees (Option UNL)
Tools Required
• T-8 TORX driver (set to 5 in-lb)
• 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 7-26 for this procedure.
1. Disconnect the power cord.
2. Remove the outer cover. 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 the Receiver Deck” on page 7-8 if necessary.
3. Identify the bias tee to be removed. To replace the bias tee, the bracket holding the attenuator, detector
(E8363C/E8364C) or fixed pad (E8362C), and bias tee must be removed.
4. Disconnect the ribbon cable (item
①) from the appropriate attenuator.
5. With a 5/16-inch torque wrench, disconnect the two semirigid cables (item
➁) from the appropriate
step attenuator, two semirigid cables (item
③) from the detector (or fixed pad), and two semirigid cables
(item
④) from the bias tee.
6. Disconnect the stranded control cable (item
⑤) and the flexible cable (item ⑥) from the appropriate
detector (E8363C/E8364C only) and the stranded bias tee cable (item
⑦) from A16 test set motherboard.
(Release the bias tee cable such that it can be removed with the bias tee.)
7. With a T-10 TORX driver, remove the three mounting screws (item
⑧) from the bracket holding the
attenuator, detector (or fixed pad), and bias tee.
CAUTION Be careful not to damage the center pins of the semirigid cables. Some flexing of the cables
is necessary to remove the assembly. Do not over-bend the semirigid cables.
8. Remove the bracket from the analyzer with the attenuator, detector (or fixed pad), and bias tee attached.
Observe the
CAUTION above.
9. With a T-8 TORX driver, remove the mounting screws holding the bias tee and install the new bias tee
with cable.
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 7-82.
To Next Page
Loading...
Need help?
General
