Wells-Gardner D9300 Series - Manual (Page 20)

Wells-Gardner Electronics Corporation
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8-2 Deflection Processor (IC301):
8-2.1 Horizontal section.
8-2.1.2 Horizontal Oscillation.
Horizontal free frequency is set to 48KHz by R314 and C347. Auto-sync processing
can be done from 28KHz to 70KHz by means of IC301 without any adjustment.
8-2.1.3 Phase Shift.
Horizontal phase shift is controlled by IC601 using I²C BUS control.
8-2.1.4 Horizontal driver output.
The output pulse having the duty-cycle of 47% is available at pin 26 of IC301
The output is used by the horizontal drive circuit.
8-2.1.5 B+ control driver output.
The output pulse is available at pin 6 of IC301 and it is used for the horizontal scan
voltage control driver.
8-2.1.6 X-Ray protection.
When the flyback voltage rises up to an unacceptable level, X-ray protection is
activated. When the X-ray input pin 25 of IC301 is above 8V, the internal latch in
IC301 is turned on. This stops all line drive output to the horizontal circuits. To
reset the protection circuit, remove main power to the monitor for 5 seconds.
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.
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.