Philips 24MC4306/37 Service Manual page 24

4. Cut-off Adjustment
Purpose: To adjust the beam current of R, G, B, and
screen voltage.
Symptom of Misadjustment: White color may be
reddish, greenish or bluish.
Test Point Adj. Point
Screen-Control
--- [CH. o / p]
buttons
Tape M. EQ.
Pattern
---
Generator
Pattern Generator
Notes: Screen Control --- FBT (Sub CBA),
FBT = Fly Back Transformer,
Use the Remote Control Unit.
1. Degauss the CRT and allow the unit to operate for
20 minutes before starting the alignment.
2. Input the Black raster signal from RF input.
3. Enter the Service mode. (See page 1-7-1.)
4. Press the [VOL p] button.
(Press [VOL p] button then display will change
"C/D", "7F" and Initial Setting.)
5. Choose CUT OFF/DRIVE mode then press [1]
button. This adjustment mode is CUT OFF (R).
6. Increase the screen control so that the horizontal
line just appears on the CRT.
7. Press the [CH. o / p] buttons until the horizontal
line becomes white.
8. Choose CUT OFF/DRIVE mode then press [2]
button. This adjustment mode is CUT OFF (G).
Press [CH. o / p] buttons until the horizontal line
becomes white.
9. Choose CUT OFF/DRIVE mode then press [3]
button. This adjustment mode is CUT OFF (B).
Press [CH. o / p] buttons until the horizontal line
becomes white.
5. H. Size Adjustment
Purpose: To obtain correct size of screen image.
Symptom of Misadjustment: Size of screen image
may not be properly displayed.
Mode Input
Black
RF
Raster
Spec.
See Reference
Notes below.
Figure
RF Input
Fig. 2
Test point Adj. Point
--- VR2531
Tape
--- Pattern Generator
Note: VR2531 --- Sub CBA
1. Input monoscope pattern.
2. Adjust VR2531 so that the monoscope pattern is
90+1%/-5% of display size and the circle is round.
6. H. Pincushion Adjustment
Purpose: To obtain straight line on the screen.
Symptom of Misadjustment: Straight line image may
not be properly displayed.
Test point Adj. Point
--- VR2530
Tape
--- Pattern Generator
Note: VR2530 --- Sub CBA
1. Input crosshatch pattern.
2. Adjust VR2530 so that the lines of the crosshatch
pattern become straight.
1-7-3
Mode
---
M. EQ. Spec.
90+1%/-5%
Mode
---
M. EQ. Spec.
See below
Input
Monoscope
Input
Crosshatch
T2221EA