160 Chapter3
Assembly Replacement
Procedure 2B. A1 Front Frame/A18 CRT (8560E)
Procedure 2B. A1 Front Frame/A18 CRT
(8560E)
Removal
WARNING The voltage potential at A6A1W3 is +9 kV. Disconnect at the
CRT with caution! Failure to properly discharge A6A1W3 may
result in severe electrical shock to personnel and damage to the
instrument.
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 steps 2
through 6 under "Procedure 5. A2, A3, A4, and A5 Assemblies
Removal."
3. Disconnect A1A1W1 from A3J602.
4. Place the spectrum analyzer top-side-up on the workbench.
5. Connect the spectrum analyzer line-power cord to provide proper
grounding while discharging the A6A1W3 post-accelerator cable.
Make sure that the spectrum analyzer line-power switch is in the off
position.
6. Connect a high voltage probe (1000:1), 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
A6A1W3 post-accelarator cable to obtain a reading on the voltmeter.
See Figure 3-3 on page 162.
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.
WARNING To avoid possible electrical shock, in the next step, use a
screwdriver having a conductive metal shank and tip, with an
insulated handle.
To Next Page
Loading...
