To Adjust The Display - HP 54520 Series Service Manual

Chapter 4: Calibrating and Adjusting
To adjust the display
2 Refer to the next figure for adjustment locations.
2 |
|
LOW BRIGHT
SUBBRISHT d
FOCUS
||
CONTRAST aT
Vv. LIN 1B
9
V.HOLD al
H.HOLU {
aig6ece?
Display Adjustment Locations
3 Adjust V-HOLD, if necessary, for vertical synchronization.
Adjust H-HOLD, if necessary, for the best compromise between horizontal
synchronization and horizontal position (horizontal centering that is still
synchronized).
5 Adjust the display rotation.
The rotation of the display is often dependant on the orientation of the instrument to the
earth's magnetic field. If the display needs adjusting, it should be adjusted with the same
orientation as it will have during use.
a Loosen the clamp at the rear of the CRT yoke.
b Rotate the yoke so the lines of the display are parallel to the sides of the bezel.
ce Carefully tighten the clamp on the yoke.
6 Set the rear-panel Intensity to maximum brightness.
7 Adjust the sweep board SUB-BRIGHT control to the highest setting where you
cannot see the underlying raster.
During this adjustment, shade the display to avoid as much ambient light as possible.
LOW BRIGHT is used to set the minimum display brightness. It is best to leave it at the
factory setting. If LOW BRIGHT has been mistakenly adjusted, set the rear-panel Intensity to
minimum and adjust LOW BRIGHT for a barely discernable display in normal ambient light.
8 Turn the rear-panel Intensity to decrease intensity to a comfortable viewing level.
The position of the Intensity adjustment should be at about 3/4 of its maximum
range.
9 Adjust the CONTRAST for the best contrast betweent the dim and bright blocks on
screen, ensuring text is legible in the dim blocks at the top and bottom of the screen.
10 Adjust FOCUS for a sharp percent symbol (%) in the top and bottom blocks of text.
11 Adjust V-LIN for equal height of the top and bottom corner squares. Square height
should be approximately 25 mm.
12 Adjust V-SIZE to make the top and bottom borders of the screen approximately 1 cm.
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