Display Pc Board To Xy Monitor Adjustment Procedure

1. Turn power on to game and allow to warm up for 15 minutes.

2. Power supply should be checked and adjusted before proceeding with monitor adjustments.

a. measure the DC voltage across Capacitor C-9 on the Display PC Board. It should read +5 volts (± .1v).

b. adjust the trimmer on the power supply if necessary.

3. Monitor display adjustment

(all controls refer to AZTARAC Display Board)

a. press and release the diagnostic switch, located inside the Coin Door, until RED concentric diamonds are displayed.

b. adjust the Intensity Control R27, (labeled "INT") , on the Display Board until inner most diamond is just visible.

c. using the "XOFS" Control R20, and the "XABS" Control R23, adjust the display until the horizontal corners of the diamonds are aligned. This will require alternate adjustments of "XOFS" and "XABS" until the horizontal "TIPS"

of the diamonds are aligned.

d. using the "YOFS Control R16 and the "YABS" Control R25, adjust the display until the vertical corners of the diamonds are aligned.

e. repeat steps c and d until the apices of the RED diamonds are aligned and meet neatly.

f. press and release the diagnostic switch, inside the Coin Door until the large circular display with switch information is displayed.

g. using the "X-GAIN" Control R24, the "Y-GAIN" Control R26, the "X0" Control R22 and the "Y0" Control R18, adjust the size and center the display so that the outer RED circle is "clipped off" evenly at four spots while the inner yellow circle remains solid.

h. press and release the diagnostic switch, inside the Coin Door, until the RED concentric diamonds are displayed.

1. adjust the GAIN and CENTERING Controls of the Wells-

Gardner 19K6401 X-Y Monitor as described in the appropriate service manual to cause the display to be centered on the screen with the ends of the RED/YELLOW lines just touching the edge of the screen viewing area.

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