HP 8568B, Performance Tests And Adjustments Manual, Page: 158 / 313

2. High-Voltage Adjustment (SN 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 High-Voltage Regulator assembly.
6. Touch the screwdriver’s tip to the top lead of each of the 11 large
vertical capacitors on the High-Voltage Regulator assembly.
7. The High-Voltage Regulator and 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 High-Voltage Regulator
Assembly to the 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
High-Voltage Regulator Assembly.
3-44 Adjustments