TB 9-4931-501-24
(3) Remove vertical amplifier from TI right compartment and remove time base
from center compartment.
(4) Install time base in TI right compartment and pull TI POWER switch to on.
(5) Position calibration fixture controls as listed in (a) through (d) below:
POSITION control to midrange.
(a)
AMPLITUDE control to midrange.
(b)
TEST switch to COM MODE.
(c)
REP RATE switch to 100 kHz.
(d)
(6) If trace is not within 0.5 division of the center horizontal graticule line, perform b below.
(7) Press TI POWER switch to off and move calibration fixture from left to center
vertical compartment.
(8) Pull TI POWER switch to on. If trace is not within 0.5 division of center
horizontal graticule line, repeat (b) below for a compromise between left and center vertical
compartments.
b. Adjustments. Adjust R135 VERT CENTER (fig. 4) to position trace to horizontal
graticule line.
14. Vertical Gain
a. Performance Check
(1) Press TI POWER switch to off and install calibration fixture in TI left compartment.
(2) Pull TI POWER switch to on.
(3) Set calibration fixture TEST switch to VERT OR HORIZ GAIN and REP
RATE switch to 1 MHz.
Figure 4. Vertical amplifier circuit board (left side).
