Agilent Technologies 856290216 service manual Procedure 6. A6 Power Supply Assembly

Procedure 6. A6 Power Supply Assembly

Procedure 6. A6 Power Supply 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 will present 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. Refer to “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 Removal,” steps 2 through 6.

4.Place the spectrum analyzer top-side-up on the work bench with A2, A3, A4, and A5 folded out to the right.

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

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 (1ess 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.Remove the three screws securing the power supply shield to the power supply and remove the shield.

13.Remove the three screws securing the A6Al high voltage assembly to the A6 power supply assembly.

14.Disconnect ribbon cable A6AlWl from A6J5 and lift the A6Al assembly out of the way. See Figure 4- 11.

Assembly Replacement 4-21