Agilent Technologies 856290216 service manual Procedure 14. W3 Line Switch Cable

Procedure 14. W3 Line Switch Cable

Removal

Warning Due to possible contact with high voltages, disconnect the spectrum analyzer line-power cord before performing this procedure.

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

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

3.Disconnect AlAlWl from A3J602.

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

Warning	The voltage potential at A6AlW3 is +9 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 (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.Remove the three screws securing the power supply shield to the power supply, and remove the shield.

13.Pull the cable tie (l), Figure 4-24, to free W9 and the post-accelerator cables.

14.Disconnect W3 from A6J2.

15.Pull W3 up from between the power supply and the CRT assembly to release it from the cable clamp.

16.Place the spectrum analyzer on its right side frame.

4-48 Assembly Replacement