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Grounding
Wire
8. Touch the screwdriver's tip to the top lead of each of the 11 large vertical capacitors on
the AlA High Voltage Regulator assembly.
9. The AlA High Voltage Regulator and AlVl CRT assemblies should now be discharged.
10. Remove the bottom cover of the IF-Display section by loosening the screw (7J shown in
Figure 5. Discharge the four large AlAlO Motherboard capacitors by shorting the 2
screws, holding each capacitor to the motherboard, together.
11. Remove the front panel from the instrument. Refer to the Front Panel Removal and
Repair procedure in the AlAl Front Panel Assembly tab.
12. Remove the 4-wire, twin-lead output cable connector @)@ from the AlA XYZ Driver
Amplifier board assembly. Remove the 3-wire cable connector 00 from the AlA board
assembly. Remove the two 904 (white/black/orange) wires a@ from the AlA board
assembly. Remove the two 905 (white/black/green) wires @@ from the AlA board
assembly.
13. Unscrew the cable clamp @@ of the 5-wire cable that comes from the rear of the
CRT. Remove the 5-wire cable connector Q)@ from the jack of the AlA High Voltage
Regulator. Remove the cable clamp from the 5-wire cable.
14. Remove the two screws @@ that attach the two rear CRT brackets to the instrument.
Both the upper, flat bracket and the lower, U- shaped bracket @a are attached to the
CRT shield with double- sided tape. Do not remove these brackets from the CRT shield.
15. Slide the CRT out through the front of the instrument.
16. Remove the CRT from its shields.
1 2 AlA
Figure 7. Discharging the CRT Post Accelerator Cable
(Serial Number Prefixes: 3004A and Above)
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