2. Display Adjustment

Procedure

1.Set the analyzer’s @ switch off. Remove the analyzer’s cover and fold out the A2 Controller and A3 Interface assemblies as illustrated in Figure 2-2. Connect the CAL OUTPUT to the INPUT. Adjustment locations are shown on the CRT neck for Al7 adjustments and in Figure 2-4 for the A2 adjustments.

Preliminary Adjustments

2.Set A17R55 X GAIN, A17R75 Y GAIN, A17R92 DDD, A17R93 ASTIG, A2R206 DGTL X GAIN, A2R215 DGTL Y GAIN, A2R262 STOP BLANK, and A2R263 START BLANK to midrange. Also set the rear-panel X POSN, Y POSN, and TRACE ALIGN to midrange.

3.Set A17R21 Z FOCUS, A17R26 X FOCUS, and A17Rll CUTOFF fully counterclockwise.

4.Set A17R4 Z GAIN fully clockwise.

5.Turn the analyzer on and allow it to warm up for at least 3 minutes. Adjust A17Rll CUTOFF until the display is visible and A17R34 COARSE FOCUS for best possible focus.

Cutoff Adjustment

6. Press (=I,[-), INTENSITY,255[jK$, STORE INTENSITY, MORE I of 2,

FOCUS ,127[=], STORE FOCUS ,then GRAT OFF. Adjust A17Rll CUTOFF until the line between the bottom of trace A and the annunciators at the bottom of the display just disappears.

Deflection Adjustments

7.Press CRAT ON, MORE 2 of 2, INTENSITY,80('), STORE INTENSITY,a, MORE 1 of 2 , and CRT ADJ PATTERN . Fold up the A3 Interface assembly.

8.Refer to Figure 2-3 for locating the lines used for adjusting DGTL X GAIN and DGTL Y GAIN. Each of these lines is actually two lines adjusted for coincidence. The two lines will form an “X” if they are not adjusted properly.

9.Adjust A2R206 DGTL X GAIN until the two vertical lines near the left edge of the display appear to be one single line.

10.Adjust A2R215 DGTL Y GAIN until the two horizontal lines near the top edge of the display appear to be one single line.

11.Adjust A2R262 STOP BLANK and A2R263 START BLANK for the sharpest corners of the outer box in the test pattern. The intensity of the corners should be the same as the middle of the lines between the corners.

12.Adjust the rear-panel TRACE ALIGN until the leftmost line of the test pattern is parallel with the CRT bezel. See Figure 2-3.

13.Adjust the rear-panel X POSN and A17R55 X GAIN until the leftmost ‘Q” characters and the softkey labels appear just inside the left and right edges of the CRT bezel.

Adjustment Procedures 2-15