5Replaceable Parts
96 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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