Whitebalanceadjustment - Sony TRINIT PVM-20M7MDE Service Manual

4-6. G2 Adjustment
l. Inputthe62Smonoscopesignal.
2. Connect an oscilloscope probe to TP22IK of the A board.
3. Entcrtheservicemode.(itemNo.l)
4. Adjust G2 so that amplitude of the 3 puJses on an oscilloscope
issaturatedrespectively. (Refertotheillustration.)
5. Writethedata.
Note 1: If saturated, the pulse amplitude will no more change
evenG2isincreased.
Note 2: Be careful not to increase 02 too much after saturated.
__ ( ( ( __ -IfG2islow.
/ /( ~Ampli'"deoftlre3p,lse,oo
_j (
I
a~ oscillosc?p_e becomes
-- b1ggerasO21sincreased.
/ /( ~The,djostm,ntpointisth,t
__J (
j
the pulse amplitude
will
no
-- more change even 02 is
increased.
4-7. White Balance Adjustment
1. Input the 625 gray scale signal having 20-step gray scales
(without burst) using the LINE A input.
2. Set the CONTRAST to 0% and BRIGHTNESS to 50% (center
detentposition).
3. Press MENU to select COI OR TEMP $ELECT then select
~. and exit
the
MENU.
4. Entertheservicemode.
~)
-29-
PVM-20M7MDE
itemNo.
item
DATA
171
6500K
RED
BIAS 100
172
6500K GREEN.
BIAS
100
173 6500K
BLUE .
BIAS
100
174
6500K RED GAIN 150
175
6500K GREEN. GAIN 150
176
6500K BLUE GAIN 150
177
5600K
RED
BIAS
100
178
5600K GREEN. BIAS 100
179
5600K
BLUE
BIAS 100
180 5600K
RED GAIN 150
181 5600K
GREEN. GAIN 150
182 5600K
BLUE .
GAIN ISO
183 SUB.BRIGHT
64
Initial data table
Note: Items No. 171,174,177 and ISO are fixed.
5. Adjust the ~so-that the steps between O and 5
IRE are cut-off and the step higher than
IO IRE
illuminate a
little.
6. Wriiethedata.
7. Input
the
625 all white signal (without burst) from the LINE
A.
8.
Set
the
CONTRAST
to 0%
and BRIGHTNESS to
50%
(center
detentposition).
9.
Adjust luminance of the all white signal so that brightness of
the CRT display is
3
nits.
Note: After brightness is adjusted to 3 nits, never touch the
BRIGH1NESS controls.
10.
Advance to~
then
tom.
11.Adjust
6SOOK GREEN BIAS
and
6500K BITJE BTAS
so that the 6500K white balance (cut-off side) satisfies the
specification as shown below. However,
fix
the RED and do
notmove.
• Specification:
6500K
t
8MPCD
Note: The white balance at the cut-off side is adjusted at
lJ,i1',
12.Writethedata.