Sharp 21HF2-SS, Service Manual

Page: 20 / 73

21HF2-SS
3 – 17
5. SCREEN, WHITE BALANCE, SUB-BRIGHTNESS & SUB-CONTRAST (1 ) ADJUSTMENT
No. Adjustment point Adjustment condition/procedure Waveform or others
1 SCREEN
ADJUSTMENT
( I2C BUS CON-
TROL) 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 cutoff 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 colour, in this condition between R-C & G-C & B-C, fix the
data of the colour appear in cut-off line and adj the other two
cutoff data (Note1) so that cut-off line colour 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.
Note 1:
R-CUTOFF(R-C)UP RC key "1"(HEX 80)
R-CUTOFF(R-C)DOWN RC key "4"(HEX 20)
G-CUTOFF(G-C)UP RC key "2"(HEX 40)
G-CUTOFF(G-C)DOWN RC key "5"(HEX A0)
B-CUTOFF(B-C)UP RC key "3"(HEX C0)
B-CUTOFF(B-C)DOWN RC key "6"(HEX 60)
R-DRIVE(R-D)UP RC key "7"(HEX E0)
R-DRIVE(R-D)DOWN RC key
"Flashback"(HEX E4)
B-DRIVE(B-D)UP RC key "8"(HEX 10)
B-DRIVE(B-D)DOWN RC key "0"(HEX 50)
2 WHITE BALANCE
ADJ
(to be done after
screen adj)
( I2C BUS CON-
TROL) 1) WHITE (HIGH BEAM) ( In Window Pattern Signal) First use
Minolta Colour Analyzer CA100, let the gun point at Dark White
position ( as drawing attach), Adj V06 until LUMINANCE Y
become 5 cd/m2, then let the gun point at White position ( as
drawing attach), Adj V04 until LUMINANCE Y become 200 cd/
m2, Adj the R-D & B-D until the axis of colour temperature
become.
**X=255,Y=255 18000 K
2) DARK WHITE (LOW BEAM) (In Window Pattern Signal)Let the
gun point at Dark White position, if the colour temperature data
shift away from the data adjusted in step 1, adjust R-C,G-C &
B-C but between them, first colour 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: Signal using W/B Pattern Generator
SX-1006 (IWATSU) or equivalent.Win-
dow Pattern Signal output level are as
above:
50% IR E 5.5% IR E 9.5% IR E
W hite Dark
W hite
W INDOW P AT T E R N S IG NAL