5 Replaceable Parts
108 Keysight E4416A/E4417A Power Meters Service Guide
Removing the A1 Power Supply Assembly
1 Remove the power supply cover by lifting it out.
2 Disconnect the line input module from the chassis and power supply assembly.
3 Disconnect the cable assembly from the power supply which connects to the
A2 processor assembly.
4 Unscrew the power supply assembly and lift out the power supply (When
replacing these screws use a 9 lb/in T15 screw driver).
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 itself. It is
essential that the gap between the terminal and the adjacent large
capacitor is maximized. Fit the connector so that its flat side faces towards
the large capacitor. 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.
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