Sony KP 48S70, Training Manual

Page: 68 / 101

xxvi
Varying the input to the convergence amplifiers changes the pattern. The
table below shows that the A and B patterns are output while the conver-
gence data is changed. The changing of this data changes the conver-
gence amplifiers input. The X axis shows the changing of the conver-
gence data and the Y axis shows the value of the data output by the
sensor amplifier. The optimum value of the data is shown where the
curves cross. This data is memorized if the Auto Focus button is pressed
in the Service Mode. When the customer uses the Auto Focus button the
system will change the convergence data to receive the optimum value at
the A/D converter.
250
1000
900
800
700
600
500
400
300
200
100
0
0 10 20 30
40
50 60
200
150
100
50
0
A
A
A + B
B
0.5mm
BV CENT
mes ratio
A/D data
mes_data0
mes_data1
mes_rati
main
YES
YES
NO
NO
Initial settings
H.SIZE enlargement
Dark current measurement
G VCENT alignment, SKEW
measurement
R VCENT, VSKEW alignment
B VCENT, VSKEW alignment
H.SIZE return & V SIZE
enlargement
Dark current measurement
G HCENT, HSKEW alignment
R HCENT, HSKEW alignment
B HCENT, HSKEW alignment
VSIZE return
Did error occur?
Was error
first time?
Write alignment value in NVM Write user value in NVM
END
Flag clear
AD timing, Pattern display
position setting