Location Of Ala Components - HP 8566B Adjustment Manual

2. High-Voltage Adjustment (SN 3001A and Below)
3-36 Adjustments
then set the LINE switch to ON (the INSTR CHECK I LED will
light.)
30. Wait approximately 30 seconds for the dc regulator circuits to
stabilize again.
31. With the front-panel INTENSITY control fully counter clockwise,
adjust AlA2R35 INT LIMIT (clockwise) until a spot is just visible
in the lower left corner of the CRT. See Figure 3-8 for
of the adjustment.
The AlA2R35 INT LIMIT adjustment compensates for the variation
in beam cut-off voltage of different CR'& and indirectly sets the
maximum beam intensity. AlA2R35 INT LIMIT should have enough
range to turn the CRT spot on and off. If the spot is always
decrease the value of AlA2R9. If the spot is always off, increase
the value of AlA2R9. Refer to %ble 3-3 for the acceptable range of
values, and to Table 3-4 for HP part numbers. Refer to Figure 3-8 for
the location of AlA2R9.
Figure 3-8. Location of AlA Components
32. Using a non-metallic alignment tool, center the front panel FOCUS
control and adjust AlA2R36 ASTIG and AlA3R14 FOCUS LIMIT
for a sharp, focused dot on the CRT display.
33. Adjust AlA2R35 INT LIMIT until the dot just disappears.
34. On the oscilloscope, adjust the channel 1 offset voltage as
necessary to measure the peak-to-peak CRT cut-off voltage, V,,,
at AlA3TP5. See Figure 3-9. This peak-to-peak voltage should be
between 45-75 V,-,. Note this voltage for use in step 39.
R35 R5
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