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