Sharp 21YF30, Service Manual

Page: 10 / 60

10-1 10-2
21YF30
10
SCREEN, WHITE BALANCE, SUB-BRIGHTNESS & SUB-CONTRAST (1 ) ADJUSTMENT
No. Adjustment point Adjustment procedure/conditions Waveform and others
SCREEN
ADJUSTMENT
(I
2
C BUS
CONTROL)
1
WHITE BAL-
ANCE ADJ
(to be done
after screen
adj)
(I
2 C BUS
CONTROL)
2
Black White
WINDOW PATTERN SIGNAL
1) In window pattern signal condition.
2) Go to service mode, then select V00.
3) By pressing R/C key S-Mute(Hex E8), R-D auto
switch to 63, B-D auto switch to 63, R-C auto switch
to 127, G-C auto switch to 127, B-C auto switch to
127, Sub-brightness V06 auto switch to 127.
Y-mute & Vertical off, screen will be in vertical cut-
off condition.
4) Adjust the Screen so that cut-off line appear in low
bright, then judge that whether the cut-off line appear
in Red or Green or Blue color, in this condition
between R-C & G-C & B-C, fix the data of the color
appear in cut-off line and adjust the other two
cut-off data (Note 1) so that cut-off line color
become white.
5)Turn the screen VR of FBT so that cut-off line just
disappear and use R/C by pressing key S-Mute
(Hex E8) to disable the Y-mute & V-cut so that
picture appear in normal mode.
1) WHITE (HIGH BEAM) (In Window Pattern Signal)
First use Minolta Color Analyzer CA100, let the gun
point at Black position (as drawing attach), adjust
V06 until BRIGHTNESS Y become 5 cd/m2, then
let the gun point at White position (as drawing
attach), adjust V04 until CONTRAST Y become 200
cd/m2, adjust the R-D & B-D until the axis of color
temperature become.
X=272, Y=275 12300 K
2) BLACK (LOW BEAM) (In Window Pattern Signal)
Let the gun point at Black position, if the color
temperature data shift away from the data adjusted
in step 1, adjust R-C, G-C & B-C but between them,
first color appears in Screen adj item 1)-4 is fixed,
adj the other two so that to obtain the similar axis as
above.
**Repeat step 1 & 2 to get a regulated position.
NOTE 1:
R-CUTOFF (R-C) UP
R/C key "1" (HEX 80)
R-CUTOFF (R-C) DOWN
R/C key "4" (HEX 20)
G-CUTOFF (G-C) UP
R/C key "2" (HEX 40)
G-CUTOFF (G-C) DOWN
R/C key "5" (HEX A0)
B-CUTOFF (B-C) UP
R/C key "3" (HEX C0)
B-CUTOFF (B-C) DOWN
R/C key "6" (HEX 60)
R-DRIVE (R-D) UP
R/C key "7" (HEX E0)
R-DRIVE (R-D) DOWN
R/C key "FLASHBACK" (HEX E4)
B-DRIVE (B-D) UP
R/C key "8" (HEX 10)
B-DRIVE (B-D) DOWN
R/C key "0" (HEX 50)
SCREEN, WHITE BALANCE, SUB-BRIGHTNESS & SUB-CONTRAST (2 ) ADJUSTMENT
No. Adjustment point Adjustment procedure/conditions Waveform and others
SUB-
BRIGHTNESS
(to be done
after screen,
white balance
adj)
(I
2
C BUS
CONTROL)
3
SUB-
CONTRAST
(to be done
after screen,
white balance
adj,
sub-bright-
ness adj)
(I
2 C BUS
CONTROL)
4
1) In window pattern signal condition.
2) Using Minolta Color Analyzer CA-100, let the gun
point at Black position (as white balance adj)
attach drawing), adjust V04 Bus data until
LUMINANCE Y = 3
±
0.5 cd/m2.
1) In Window Pattern Signal condition.
2) Using Minolta Color Analyzer CA-100, let the gun
point at White position (as attach drawing), adjust
V04 Bus data until LUMINANCE Y = 200
±
10 cd/
m2.
1) Receive the “Monoscope Pattern” signal.
2) Press R/C to set Picture NORMAL condition.
3) Connect the DC miliammeter between TP 603
( + ) & TP 602 ( - ).
(Full Scale: 3mA Range)
4) Beam current must be within 1100
±
100
µ
A.
MAX Beam
Check 5
Black
WINDOW PATTERN SIGNAL
White
WINDOW PATTERN SIGNAL