Replacing The Frequency Converter; Replacing The Regulator Board Assembly; Replacing The Filter Capacitors - Agilent Technologies 8511B Operating And Service Manual

NOTE
(1) Replacing the
Frequency Converter
WARNING
(2) Replacing the
Regulator Board
Assembly
(3) Replacing the Filter
Capacitors
Replacement Procedures
To install a new part in the following procedures, reverse the steps.
Turn the test set OFF and disconnect the power cord form the mains.
Electrocution can result if power is not removed from the test set prior to this
procedure
The frequency converter consists of a voltage-tuned oscillator (VTO)
assembly and four samplers.
1. Remove the semi-rigid cable attached to each of the four samplers.
2. Remove the two in-line attenuators from the samplers.
3. Remove the six flexible cables from the frequency converter by gently
pulling on the gold connector.
4. Remove the four frequency converter mounting plate screws and the
bracket screw that fastens the frequency converter to the chassis.
5. Unplug the ribbon cable near the front panel.
6. Unplug the four harnessed (multi-colored) wire and socket assemblies.
7. Lift the frequency converter out of the test set.
8. Remove the frequency converter bracket by removing the two pozidriv
screws.
1. Unplug the transformer socket from the regulator board.
2. Remove the three mounting screws from the top edge of the regulator
board.
3. Remove the regulator board. (You may have to partially back out one of
the transformer mounting screws for clearance.)
1. Set the test set upright and pull the metal and plastic cover off the
capacitors.
2. Turn the test set over and remove the bottom cover.
3. To discharge the capacitors attach one end of an insulated clip lead to the
chassis of the instrument and the other end of the clip lead to a 100
watt resistor. Use the resistor to discharge each capacitor terminal (large
pozidriv screw on the bottom side of the test set). Each capacitor has two
7-4 Agilent 8511B Test Set Operating and Service Manual
Ω
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