Agilent Technologies 856290216 service manual Procedure 7. A6Al High Voltage Assembly

Procedure 7. A6Al High Voltage Assembly

Procedure 7. A6Al High Voltage Assembly

Removal

Warning The A6 power supply and A6Al high voltage assemblies contain lethal voltages with lethal currents in all areas. Use extreme care when servicing these assemblies. Always disconnect the power cord from the instrument before beginning this replacement procedure. Failure to follow this precaution can represent a shock hazard which may result in personal injury.

1.Disconnect the power cord from the spectrum analyzer.

2.Remove the spectrum analyzer cover assembly as described in “Procedure 1. Spectrum Analyzer Cover.”

3.Fold out the A2, A3, A4, and A5 assemblies as described in “Procedure 5. A2, A3, A4, and A5 Assemblies.”

4.Place the spectrum analyzer top-side-up on the work bench.

Warning The voltage potential at A6AlW3 is t9 kV. Disconnect at the CRT with caution1

Failure to properly discharge A6AlW3 may result in severe electrical shock to personnel and damage to the instrument.

5.Connect the spectrum analyzer line-power cord to provide proper grounding while discharging the A6AlW3 post-accelerator cable. Make sure that the spectrum analyzer line-power switch is in the off position.

6.Connect a high voltage probe (lOOO:l), such as the HP 34111A to a voltmeter with a 10 megohm input.

7.Connect the clip lead of the probe (ground) to the chassis of the spectrum analyzer.

8.Slip the tip of the high voltage probe under the rubber shroud of the A6AlW3 post-accelerator cable to obtain a reading on the voltmeter. See Figure 4-2.

9.Keep the high voltage probe on the post-accelerator connector until the voltage has dropped to a voltmeter reading of less than 5 mV (less than 5 V at the connector). This normally takes about 30 seconds.

10.Disconnect the line-power cord from the spectrum analyzer.

11.Using a small screwdriver with the shank in contact with the CRT shield assembly, slip the tip of the screwdriver under the rubber shroud of the A6AlW3 post-accelerator cable and short the cable to ground on the CRT shield assembly. See Figure 4-2.

12.Pry out the black grommet protecting post-accelerator cable A6AlW3 from the CRT shield assembly.

13.Carefully unsnap the A6AlW3 post-accelerator cable from the CRT and discharge it by shorting the cable to chassis ground on the CRT shield assembly.

14.Remove the three screws securing the power supply shield to the power supply and remove the shield.

Assembly Replacement 4-25