16. Cut-off Adjustment17. White Balance Adjustment
Purpose: To adjust the beam current of R, G,Pur B,pos aned:T o mix red, green and blue beams correctly
screen voltage.for pure white.
Symptom of Misadjustment: White color may beSymptom of Misadjustment: White becomes bluish
reddish, greenish or bluish.or reddish.
Test PointAdj. PointModeInputTest PointAdj. PointModeInput
Screen-Control
White
Black
---CH o / p RFCH o / p Raster
RasterScreenRF
buttonsbuttons(APL
TapeM. EQ.Spec.100%)
Pattern See Reference TapeM. EQ.Spec.
---
GeneratorNotes below.
Pattern
Figure---Generator, See below
Color analyzer
PATTERN GENERATOR
Figure
EXT. INPUTFig. 2Color Analyzer Fig. 3
Note:Screen Control FBT --- Main CBANote:Use service remote control unit
F.B.T= Fly Back Transformer 1. Operate the unit more than 20 minutes.
Use service remote control unit 2. Face the unit to east. Degauss the CRT using De-
1. Degauss the CRT and allow CRT to operate forga 20ussing Coil.
minutes before starting the alignment. 3. Input the White Raster (APL 100%).
2. Input the Black Raster Signal from RF Inp 4.ut.Set the color analyzer to the CHROMA mode and
3. Enter the Service mode. (See page 5-1)after zero point calibration, bring the optical recep-
4. Press "VOLp" bu tton on the service remote cotorn- to the center on the tube surface (CRT).
trol unit and select "C/D" mode. (Display 5. chaEnngeters the Service mode. Prpes"s " buttonVOL on the
"C/D," "7F," "LANGUAGE," "ACCESS CODE,"service remote control unit and select "C/D" mode.
"SOUND TYPE," "VIDEO TONE," "FM MODE,"(Display changes "C/D," "7F," "LANGUAGE," "AC-
"V-OUT," "VIDEO," "AV MEMO," "STABLECESS CODE," "SOUND TYPE," "VIDEO TONE,"
SOUND," "FILTER," "500," and "YUV MEMORY""FM MODE," "V-OUT," "VIDEO," "AV MEMO,"
cyclically when "Vp OL button is pressed.) then"STABLE SOUND," "FILTER," "500," and "YUV
press "1." The display will momentarily show "CUTMEMORY" cyclically when "VpO" buL tton is
OFF R" (R= Red). Now there should be a horizprones-sed.) then Press No. 8 button on the service re-
tal line across the center of the picture tubmote coe. Ifntrol Unit.
needed gradually turn the screen control on the 6. Pr eflssy No-. 4 button on the service remote control
back, clockwise until the horizontal line apunpeait rfors. Red adjustment. Press N0. 5 button on the
Adjust the Red Cut off by pressing tho/p" e "CH service remote control unit for Blue adjustment.
buttons. Proceed to Step 5 when the Red Cut 7. offIn each color mode, Proess/p "" buttCH on to adjust
adjustment is done.the values of color.
5. Press the "2" button. The display will mo 8.menAdtjusaritlinyg Red and Blue color so that the temperature
show "CUT OFF G" (G=Green). Adjust the Greenbecomes 9200K (x: 286 / y: 294)?3%.
Cut off by pressing tohe /p""CH bu ttons. Proceed
9. At this time, Re-check that Horizontal line is white.
to step 6 when the Green Cut off adjustment is done.
If not, Re-adjust Cut-off Adjustment until the Hori-
6. Press the "3" button. The display will momzentontaarlil Lyine becomes pure white.
show "CUT OFF B" (B=Blue). Adjust the Blue cut
10. Turn off and on again to return to normal mode. Re-
off by pressing theo/ p"" buCH ttons. When done
ceive APL 100% white signal and Check Chroma
with steps 4, 5 and 6 the horizontal line should be
temperatures become 9200K (x: 286 / y: 294)?3%.
pure white if not, then attempt the Cut off adjust-
Note: Confirm that Cut Off Adj. is correct after this
ment again.
adjustment, and attempt Cut Off Adj. if needed.
5-7L6655EA |
ACEC
