HP 85662A Troubleshooting And Repair Manual page 59

CRT Removal and Replacement
(Serial Number Prefixes: 2403A-3001A)
Warning
This procedure should be performed by qualified personnel only. Voltages are
present which, if contacted, could cause serious personal injury. Approximately
-4000 V dc is present on the AlA High Voltage Regulator assembly even
when the ac line cord is disconnected. The CRT can hold a +18 kV dc charge
for several days if the post accelerator cable is not discharged.
Warning
Do not handle the AlVl CRT, the AlA High-Voltage Regulator Assembly
or Al Al 1 High-Voltage Multiplier until the following high-voltage discharge
procedure has been performed.
Removal Procedures
1. Remove the ac line cord from both instrument sections.
Warning
With the ac power cords disconnected, voltages can still be present which, if
contacted, could cause serious personal injury.
2. Remove the feet @ from the rear of the instrument by removing the screws @ shown in
Figure 1. Remove the feet @ by removing the screws @ and loosening the thumbscrews
3. Separate the instruments by holding the RF Section in place and pulling forward, toward
the front panel, on the IF-Display Section.
4. When the instruments have been separated, remove the top cover from the IF-Display
Section by loosening the screw @ shown in Figure 1.
Figure 1. CRT Replacement, Instrument Rear View