HP 85662A, Troubleshooting And Repair Manual

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Figure 6. CRT Replacement, Top View,
(Serial Number Prefixes: 3004A and Above)
5. Obtain an electrician’s screwdriver which has a thin blade at least eight inches long. The
handle of the screwdriver must be made of an insulating material.
6. 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.
7. Slide the screwdriver’s blade through the sheet metal opening between the CRT and
the High Voltage Regulator as shown in Figure 7. 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. Use the blade of the
screwdriver to unsnap the post accelerator cable from the CRT. Lay the post accelerator
cable on top of the CRT shield to ground the cable. To ground the CRT, touch the
opening on the side of the CRT, where the post accelerator connects, with the grounded
tip of the screwdriver.