5 Replaceable Parts
126 Keysight E4416A/E4417A Power Meters Service Guide
Replacing The Chassis Assembly
1 Remove the Power Meter Cover as shown in “Removing the Power Meter
Cover” on page 107.
2 Disassemble the power meter down to allow access to the rear panel
connectors (Refer to “Removing the A4 Comms Assembly” on page 111).
3 For Standard or Option #002 models, disconnect the Power Reference Cable
from the Front Panel Assembly.
4 For Option #003 units, disconnect the Power Reference Cable from the Chassis
Assembly (rear panel).
5 Remove the A3 Front Panel Assembly as shown in “Removing the A3 Front
Panel Assembly” on page 116.
6 For Option #002 or Option #003 models, remove the Rear Panel Power Sensor
Cable Assemblies as shown on “Replacing the Rear Panel Power Sensor Cable
Assemblies (Options 002 and 003)” on page 122.
7 For Option #003 units, remove the Rear Panel Power Reference Connector as
shown on “Replacing the Rear Panel Power Reference Cable Assembly (Option
003)” on page 124.
8 Remove the Recorder Output(s) Cable Assembly as shown on “Replacing the
Rear Panel Recorder Output(s) Cable Assembly” on page 125.
9 Remove all blanking plugs from the rear panel.
10 Obtain the new Chassis Assembly, and then re-assemble the Power Meter by
following steps 1 to 9 in reverse order.
When replacing the power supply unit in the power meter, ensure that all
earth wiring is reconnected. There are two terminals to check, the first is
the force fit connector to the power supply unit and the second a closed
loop terminal bonded to the chassis with an M3.5 machine screw (use a 9
lb/in T15 screw driver). All the protective earth wiring can be identified by
the insulation color green with a yellow stripe.
Once re-assembly is complete, the unit must be safety-tested in
accordance with local guidelines and procedures. This safety-test may
take the form of an Earth Continuity Test, Hi-Pot Test, etc.
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