Wells-Gardner D9100 instruction

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 which has 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.