Wells-Gardner D9100 Manuale Utente
8-2.2
Vertical section:
8-2.2.1 Vertical
oscillation.
The free running frequency of the vertical oscillator is determined by the
capacitor C342 at pin VCAP (pin22) of IC301.
capacitor C342 at pin VCAP (pin22) of IC301.
8-2.2.2
Vertical amplitude.
Vertical amplitude is controlled by IC601 using I²C bus control.
8-2.2.3
Vertical position.
Vertical position is controlled by IC601 using I²C bus control.
8-2.2.4
East-west parabola.
A parabola wave-form is available on pin 24 of IC301 for driving the
pincushion correction stage. Amplitude of parabola waveform is
controlled by IC601 using I²C.
pincushion correction stage. Amplitude of parabola waveform is
controlled by IC601 using I²C.
8-2.3
B+ Regulator.
B+ PWM regulator output is available on pin 28 of IC301 for driving the B+
control stage. This PWM output is adjusted through VR301.
control stage. This PWM output is adjusted through VR301.
8.3
Vertical Deflection (IC201):
IC201 (KA2142) is used for direct driving of the vertical deflection yoke.
8-4
Horizontal scan voltage control stage:
The set-up converter is used in this stage. The output pulse at pin 28 of the
IC301 is synchronized on horizontal frequency. This pulse is operated via buffer
stage Q311/Q312. This output is rectified through
D315/L304.
In this way, the supply voltage to the flyback transformer can be proportional
to the horizontal line frequency.
IC301 is synchronized on horizontal frequency. This pulse is operated via buffer
stage Q311/Q312. This output is rectified through
D315/L304.
In this way, the supply voltage to the flyback transformer can be proportional
to the horizontal line frequency.
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