Chapter 3 185
Assembly Replacement
Procedure 7. A6A1 High Voltage Assembly (8560E only)
Procedure 7. A6A1 High Voltage Assembly
(8560E only)
Removal
WARNING The A6 power supply and A6A1 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 workbench.
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.
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 A6A1W3
post-accelarator cable rubber shroud 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.
11.Using a small screwdriver with the shank in contact with the CRT
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