Philips 20MC4304, Service Manual

Page: 208 / 316

1-7-5 T1102EA
6. H f
0
Adjustment
Purpose: To get correct horizontal position and size of
screen image.
Symptom of Misadjustment: Horizontal position and
size of screen image may not be properly displayed.
Note: R2583 --- Sub CBA
1. Connect frequency counter to R2583.
2. Operate the unit for at least 20 minutes.
3. Enter the Service mode. (See page 1-7-1.) Press
[2] button on the remote control unit and select H-
ADJ mode.
4. Press [CH.
o
/
p
] buttons on the remote control
unit so that the display will change “0” to “7.”
5. At this moment, choose display “0” to “7” when the
frequency counter display is closest to 15.734 kHz
±
300 Hz.
7. 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.
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.
Test Point Adj. Point Mode Input
R2583 [CH.
o
/
p
] buttons Video ---
Tape M. EQ. Spec.
--- Frequency Counter 15.734 kHz
±
300 Hz
Test Point Adj. Point Mode Input
---
Screen-Control
[CH.
o
/
p
]
buttons
RF
Black
Raster
Tape M. EQ. Spec.
---
Pattern
Generator
See Reference
Notes below.
Figure
Fig. 5-1
Pattern Generator
RF Input