Sylvania SRT2227W, Service Manual

Page: 20 / 54

5-6 L2705EA
15. White Balance Adjustment
Purpose: To mix red, green and blue beams correctly
for pure white.
Symptom of Misadjustment: White becomes bluish
or reddish.
Note: Use service remote control unit
1. Operate the unit more than 20 minutes.
2. Face the unit to east. Degauss the CRT using De-
gaussing Coil.
3. Input the White Raster (APL 100%).
4. Set the color analyzer to the CHROMA mode and
after zero point calibration, bring the optical recep-
tor to the center on the tube surface (CRT).
5. Enter the Service mode. Press "VOL
p
" button on the
service remote control unit and select "C/D" mode.
(Display changes "C/D," "7F," "LANGUAGE," "AC-
CESS CODE," "SOUND TYPE," "VIDEO TONE,"
"FM MODE," "V-OUT," "VIDEO," "AV MEMO,"
"STABLE SOUND," "FILTER," "500," "YUV MEM-
ORY," "NO SIG BRT," "A-MUTE POL," and "V-
MENU" cyclically when "VOL
p
" button is pressed.)
then Press No. 8 button on the service remote control
Unit.
6. Press No. 4 button on the service remote control
unit for Red adjustment. Press N0. 5 button on the
service remote control unit for Blue adjustment.
7. In each color mode, Press "CH
o
/
p
" button to adjust
the values of color.
8. Adjusting Red and Blue color so that the temperature
becomes 9200K (x: 286 / y: 294)±3%.
9. At this time, Re-check that Horizontal line is white.
If not, Re-adjust Cut-off Adjustment until the Hori-
zontal Line becomes pure white.
10. Turn off and on again to return to normal mode. Re-
ceive APL 100% white signal and Check Chroma
temperatures become 9200K (x: 286 / y: 294)±3%.
Note: Confirm that Cut Off Adj. is correct after this
adjustment, and attempt Cut Off Adj. if needed.
16. Sub-Brightness Adjustment
Purpose: To get proper brightness.
Symptom of Misadjustment: If Sub-Brightness is
incorrect, proper brightness cannot be obtained by
adjusting the Brightness Control.
Note: IQW Setup level --- 7.5 IRE
Use service remote control unit
1. Enter the Service mode. (See page 5-1)
Then input IQW signal from RF Input.
2. Press "MENU" button on the service remote control
unit and Select "BRT" mode. (Display changes
"BRT," "CNT," "CLR," "TNT," "V-TNT," and "SHARP"
cyclically when "MENU" button is pressed). Press
"CH
o
/
p
" buttons so that the bar is just visible (See
above figure).
3. Turn the power off and on again. (Main power but-
ton on the TV unit.)
17. Focus Adjustment
Purpose: Set the optimum Focus.
Symptom of Misadjustment: If Focus Adjustment is
incorrect, blurred images are shown on the display.
Note: Focus VR (FBT) - Main CBA,
FBT=Fly Back Transformer
1. Operate the unit more than 30 minutes.
2. Face the unit to the East and Degauss the CRT
using Degaussing Coil.
3. Input the Monoscope Pattern.
4. Adjust the Focus Control on the FBT to obtain
clear picture.
Test Point Adj. Point Mode Input
Screen
CH
o
/
p
buttons
RF
White
Raster
(APL
100%)
Tape M. EQ. Spec.
---
Pattern
Generator,
Color analyzer
See below
Figure
Color Analyzer
Fig. 3
Test Point Adj. Point Mode Input
---
CH
o
/
p
buttons
RF IQW
Tape M. EQ. Spec.
---
Pattern
Generator
See below
Figure
Test Point Adj. Point Mode Input
--- Focus Control ---
Mono-
scope
Tape M. EQ. Spec.
---
Pattern
Generator
See below
White
Black
Fig. 4
This bar
just
visible