1 - 27
1.4.3
DBF (Dynamic Beam Focus) circuit
Since the display is flattened, the focus becomes unequal between the center and circumfer-
ence of the picture. To compensate for it, it is necessary to superimpose the parabola voltage
of 370Vp-p in the horizontal cycle with the static focus (with the horizontal width is 396mm) and
the parabola voltage of 145Vp-p in the vertical cycle. The slight voltage that is generated from
the parabola voltage generating circuit is amplified and reversed to generate the high voltage
in order to keep the focus equal. This circuit is called DBF circuit.
As shown in Fig. (16), the circuit is composed of the parabola voltage generating circuit IC601,
amplifier section IC6A1 in the front step, Q7A1 to Q7B5 of amplifier section in the rear step,
T7A1, and so on.
Video period
Figure 15
In case of the horizontal DBF :370Vp-p
In case of the vertical DBF
:145Vp-p
Approx. 350V
Vertical DBF
Horizontal DBF
90V
Q7B1
Q7B2
Q7B4
Q7B5
R7A5
R7B7
R7B9
IC6A1
IC601
DEFL-
PROCESSOR
IC
OP-AMP
Q7A1
R7A5
R7A4
R7A6
T7A1
R7A3
To FBT
Q7B3
Figure 16
Содержание MultiSync FP1355 FP1355 FP1355
Страница 20: ...1 14 Figure 5 Horizontal deflection circuit Q503 Q504 T502 Q502 D503 C506 L540 LIN IC501 Q540 Q510 215V ...
Страница 23: ...1 17 Q502 Q502 Damper diode Current waveform fh 106k ...
Страница 25: ...1 19 Q502 Q502 Damper diode Current waveform Q502 Ic Q502 Vce ...
Страница 58: ...1 52 Figure 25 IC211 MC13289ASP block diagram ...
Страница 63: ...1 57 Figure 30 IC212 XC3824P2 block diagram ...
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Страница 120: ...MultiSync FP1355 User s Manual ...
Страница 144: ... VSP C0464 REVISE 2 ...
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Страница 169: ...VSP C0464 Fig 5 1 PRINTING SPECIFICATION OF CARTON BOX North America ...
Страница 170: ...VSP C0464 Fig 5 2 PRINTING SPECIFICATION OF CARTON BOX Europe ...
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