Installation Note N5242-90010 21
Description of the Upgrade
All Instruments
Step 8. Remove the Existing Attenuators, Brackets, and Bias Tees (If
Present)
Refer to
for this step of the procedure. Although only Option 419 is
shown in the illustration, Option 423 is similar in appearance.
1. Place the analyzer bottom-side up on a flat surface.
If bias tee option is installed (NOT N5241/42A-H85):
For analyzers with serial numbers prefixed MY/SG/US5321 and above:
2. Remove two screws (item
①
) from the A38 port 1 bias tee and the A41
port 2 bias tee and lift them out of the PNA, and set them aside for
reinstallation later.
For analyzers with serial numbers prefixed MY/SG/US5310 and below:
3. Remove two screws (item
①
) from the A38 port 1 bias tee and the A41
port 2 bias tee and lift them out of the PNA. These old bias tees have 2.4
mm connectors and will be replaced later with bias tees having 3.5 mm
connectors.
For all analyzers:
4. Remove three screws (item
➁
) from each attenuator bracket.
5. Remove the attenuator brackets, with the attenuators still attached, from
the analyzer.
6. If it is necessary to remove any other cables from the analyzer to facilitate
removal of the attenuators and bias tees brackets, be sure to note their
locations and set them aside for reinstallation later.