TB 9-4931-501-35
(6) If zeros are not complete or have overscanning, (overscanning causes a bright
dot where traces overlap) perform b(3) below.
(7) Set TI POWER switch to off and install Q1040.
b. Adjustments
(1) Adjust VERT CENTER R135 (fig. 4) to position the bottom row of zeros to the
middle of the TI screen bottom graticule division. Adjust VERTICAL SPACING R1118
(fig. 5) to
position the top row of
zeros to the middle of the TI
screen top
graticule
division. Due to interaction, it may be necessary to readjust R135 and R1118 until
correct zero location is obtained.
(2) Adjust HORIZONTAL POSITIONING R1110 (fig. 5) until first and last zero of
both rows arc within TI graticule.
(3) Adjust CHARACTER SCAN R1006 (fig. 5) for fully scanned zeros without
overscanning. Turn TI POWER switch to off, and install transistor Q1040.
NOTE
Do not perform power supply checks if all other parameters
arc within tolerance.
a. Performance Check
(1) Install vertical amplifier (A6) in TI left compartment and time base (A4) in
right compartment. Pull TI POWER switch to on.
(2) Connect digital voltmeter (A3) between test point -30 V (fig. 2) and chassis
ground, using adapters and leads supplied with digital voltmeter.
(3) If digital voltmeter does not indicate between -29.925 and -30.075 V dc,
perform b(1) below.
(4) Connect digital voltmeter between test point +30 V (fig. 2) and chassis
ground.
(5) If digital voltmeter does not indicate between +29.925 and +30.075 V dc,
perform b(2) below.
(6) Connect digital voltmeter between voltage test points listed in table 4 and
chassis ground. Digital voltmeter indications should be within limits specified in table