2.High-Voltage Adjustment (SN 3004A and Above)

3.Connect one end of a jumper wire (made of insulated wire and two alligator clips) to the blade of the screwdriver. Connect the other end of the jumper wire to the metal chassis of the IF Display Section. This grounds the screwdriver.

4.Slide the screwdriver’s blade between the CRT and the sheet metal as shown in Figure 3-15. Gently work the tip of the screwdriver under the post-accelerator cable’s rubber shroud. Make sure that the screwdriver’s tip touches the connection between the post accelerator cable and the CRT. You should hear a cracking sound when the cable discharges.

5.Remove the cover from the AlA High-Voltage Regulator assembly.

6.Touch the screwdriver’s tip to the top lead of each of the 11 large vertical capacitors on the AlA High-Voltage Regulator assembly.

7.The AlA High-Voltage Regulator and AlVl CRT assemblies should now be discharged.

G r o u n d i n g

W i r e

Figure 3-15. Discharging the CRT Post-Accelerator Cable

Note A small bracket and screw secure the AlA High-Voltage Regulator Assembly to the AlAlO Display Motherboard Assembly. The bottom cover of the IF-Display Section must be removed to gain access to this screw prior to removal of the AlA High-Voltage Regulator Assembly.

3-44 Adjustments