HPS-1478
4.4
White balance
Note:
ü
The cut point doesn’t need adjustment, because it’s automatically made by
the IC101.
ü
The white adjustment is already pre-adjusted and incised in the IC101 and,
thus, its adjustment is not necessary.
Otherwise, if it is necessary to change the temperature of the white pattern,
proceed in the following way:
a)
Enter in the service mode.
b)
Select via
CH
Ù
or
CH
Ú
the WPR (29), WPG (30) and WPB (31) functions.
c)
Increase or decrease the function via
VOL
Ø
or via
×
VOL
respectively.
4.5
Screen adjustment
Mode 1
:
a)
Apply a gray scale pattern.
b)
Adjust the controls to:
ü
Brightness - 50%
ü
Contrast - 70%
c)
Measure DC voltage on the three cathodes (CRT) (one at a time) and select
the highest one.
d)
Connect a X100 test tip to the selected cathode (highest voltage DC).
e)
Adjust the screen potentiometer to obtain 130V, according to the illustration
bellow:
Note.
The oscilloscope should be positioned in the vertical mode.
150 Volts
GND
