Agilent Technologies e4419b, e4418b manual Replacing The Chassis Assembly

		Replaceable Parts
		Assembly and Disassembly Guidelines
	Replacing The Chassis Assembly
	1.	Remove the Power Meter Cover as shown in “Removing the Power Meter
		Cover”, on page 5-8.
	2.	Disassemble the power meter down to allow access to the rear panel
		connectors (Refer to “Removing the A4 Comms Assembly”, on page 5-11).
	3.	For Standard or Option #002 units, 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 5-15.
	6.	For Option #002 or Option #003 units, remove the Rear Panel Power Sensor
		Cable Assemblies as shown in “Replacing the Rear Panel Power Sensor
		Cable Assemblies (Options 002 and 003)”, on page 5-19.
	7.	For Option #003 units, remove the Rear Panel Power Reference Connector
		as shown in “Replacing the Rear Panel Power Reference Cable Assembly
		(Option 003)”, on page 5-21.
	8.	Remove the Recorder Output(s) Cable Assembly as shown on page 5-21.
	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.
WARNING	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 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.
WARNING	Once re-assembly is complete, the unit must be safety-tested in
	accordance with local guidelines & procedures. This safety-test may
	take the form of an Earth Continuity Test, Hi-Pot Test, etc.

Agilent E4418B/E4419B Service Guide 5-23