HP 8568B, Performance Tests And Adjustments Manual, Page: 150 / 313

2. High-Voltage Adjustment (SN and Below)
39. Slowly adjust the front-panel INTENSITY control through its
entire range while monitoring the peak-to-peak voltage at
As the INTENSITY control is turned clockwise, the
peak-to-peak voltage at will drop. To prevent long-term
CRT damage, this voltage should
not
drop below (V,, or
12 whichever is greater. See Figure 3-10. (The value of
was recorded in step 34.)
If the front-panel INTENSITY control cannot be set fully
clockwise without dropping below this minimum peak-to-peak
voltage, then perform the following:
a. Set the INTENSITY control fully counter clockwise.
b. Set the LINE switch to STANDBY.
c. Increase the value of
d. Return to step 34.
Note
Maximum CRT life expectancy is obtained when the peak-to-peak
voltage at
is as large as possible with the INTENSITY
control set fully clockwise. The display illumination must fully
disappear with the INTENSITY control set fully counter clockwise.
5 0 . 0
85.00 v
Figure 3-10. Waveform at
40. Replace the cover
on
the High-Voltage Regulator Assembly.
41. The High-Voltage Adjustment is completed. If an
or assembly has been repaired or replaced, perform
adjustment procedure 3, “Preliminary Display Adjustment (SN
and Below)“, and then adjustment procedure 4, “Final
Display Adjustments (SN and Below)“. If the
3-36 Adjustments