White Balance - Sony PVM-1444QM Service Manual

:
1
PVM-1 440QM/1 442QM/1
444QM
3-4.
WHITE
BALANCE
[Screen (G2) Voltage)
1.
Receive
a
dot signal
with the pattern generator.
2.
Switch over
COLOR TEMP
to
6500°
K.
3.
Using oscilloscope,
adjust with
RV1710 (SUB BRT)
on
V
board so that the
green cathode voltage
against
ground
becomes 160
V
DC.
4. Similarly,
adjust
with
RV1704
(B
BKG)
and
RV1705
(R
BKG)
on
V
board so
that
the blue
and
red
cathode voltages
become 160
V
DC.
7.
Adjust with
the
color analyzer the white balance.
8.
Reset the
luminance
level
of the pattern generator,
and
adjust the
white
balance.
(High
light
con-
dition.)
5.
Observing the screen, adjust
with
RV709
(SCREEN)
on C board so that the
back ground of the dot
signal
is
bright
dimly.
[White Balance)
1.
Receive
a
color-bar
pattern
signal
with the pattern
generator,
and
to
make
black
and
white screen
by
chroma
switch
off.
2.
•
BRIGHTNESS
50%
•
CONTRAST
Minimum
•
CHROMA 50%
•
DRIVE volume
(V
BOARD)
mechanical
center
•
BKG
volume
(V
BOARD)
mechanical center
3.
Adjust
RV1710 (SUB BRIGHT)
so that
the blue
stripe
portion
on the color-bar pattern
signal
is
bright dimly.
color-bar pattern
BL
-a
4.
Receive an
entirely
white
signal
from
the pattern
generator.
5.
CONTRAST
70%
6.
Using
the
luminance
level
meter, adjust
the
luminance
level of
the pattern generator
becomes
8
Nit.
(The condition the screen
is
bright dimly.)
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15
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