TB 9-4931-501-24
b. Adjustments. No adjustment can be made.
9. Intensity Range
a. Performance Check. Slowly adjust TI INTENSITY control cw until trace appears
on TI screen. If the TI INTENSITY control is not between its 8 and 11 o'clock position,
perform b below.
b. Adjustment. Turn TI INTENSITY control fully ccw and adjust R435 INTENSITY
RANGE (fig. 1) until trace is just visible and then readjust until trace is just extinguished.
10. Focus and Astigmatism
a. Performance Check
(1) Position vertical amplifier controls as listed in (a) through (d) below:
Channel 1 POSITION control to midrange.
(a)
Channel 1 INPUT COUPLING switch to DC.
(b)
MODE switch to CH1.
(c)
TRIGGER switch to CH1.
(d)
(2) Position time base controls, as listed in (a) through (e) below:
(a) Main triggering:
1 SLOPE switch to +.
2 MODE switch to AUTO TRIG.
3 TRIGGER SOURCE switch to LEFT.
POSITION control as desired.
(b)
SWP MAG switch to X1 (out).
(c)
MAIN SEC/DIV switch to 1 ms.
(d)
DISPLAY MODE switch to MAIN SWP.
(e)
(3) Adjust TI INTENSITY control for a normal display.
(4) Set time base MAIN SEC/ DIV switch to AMP (fully ccw) and adjust TI
FOCUS control fully cw. If displayed spot on TI screen is not round, perform b below. It
may be necessary to readjust INTENSITY control.
(5) Set time base MAIN SEC/DIV switch to 1 ms.
b. Adjustments. Adjust R370 ASTIG (fig. 3) and TI FOCUS control simultaneously to
obtain best defined spot on TI screen.
11. Trace Alignment
a. Performance Check. Adjust vertical amplifier and time base POSITION controls
to center trace on TI horizontal graticule line. If trace is not aligned with TI center
horizontal graticule line, perform b below.
