TB 9-4931-501-24
Figure 3. Horizontal circuit board (top).
b. Adjustment. Adjust R375 TRACE ROTATION (fig. 3) until trace is aligned with TI
center horizontal graticule line.
12. Geometry
a. Performance Check
(1) Press TI POWER switch to off.
(2) Remove time base from TI right compartment and install in center compartment.
(3) Remove vertical amplifier from TI left compartment and install in right
compartment.
(4) Pull TI POWER switch to on.
(5) Adjust TI FOCUS and INTENSITY controls for a well defined trace that
extends vertically above and below graticule area.
(6) Adjust vertical amplifier POSITION control to move TI trace across entire
graticule area. If trace bows or tilts greater than 0.1 division anywhere in graticule area,
perform b below.
b. Adjustment. Adjust R365 GEOM (fig. 3) for minimum bowing or tilt of trace at left
and right edges of graticule. It may be necessary to readjust R365 (fig. 3) to obtain less
than 0.1 division of bowing and tilt everywhere in graticule area.
13. Vertical Centering
a. Performance Check
(1) Press TI POWER switch to off.
(2) Install calibration fixture in TI left compartment.
