TB 9-6625-149-50
(a) TRIGGERING MODE switch to AUTO.
(b) TRIGGER SLOPE switch to +LINE.
(c) STABILITY control to PRESET.
(d) TIME/CM switch to 50 SEC.
(17) Connect ac/dc voltmeter (A2) between wiper arm of TI PRESET ADJUST
control (fig. 2) and chassis ground.
(18) Turn PRESET ADJUST control fully counterclockwise; then, turn clockwise
until trace appears on TI crt. Record ac/dc voltmeter indication.
(19) Slowly turn PRESET ADJUST control clockwise until trace brightens. Record
ac/dc voltmeter indication.
(20) Turn PRESET ADJUST control to obtain an indication on ac/dc voltmeter
midway between indications recorded in (18) and (19) above.
b. Adjustments. No further adjustments can be made.
13. Horizontal High-Frequency Compensation
a. Performance Check
(1) Connect TI CAL OUT to HORIZ INPUT and TRIG INPUT, using cable,
adapter, and leads (B4, B2, and B6). Connect TI SAWTOOTH OUT to calibration adapter
(A4) external INPUT, using cable and adapter (B5 and B3).
(2) Position TI controls as in (a) through (e) below:
(a) TRIGGER SLOPE switch to +EXT.
(b) TIME/CM switch to 1 MILLISEC.
(c) AMPLITUDE CALIBRATOR switch to 1 VOLT.
(d) HORIZONTAL DISPLAY switch to EXT HORIZ ATTEN X1.
(e) EXTERNAL HORIZ ATTENUATOR 10-1 control for 4 divisions of
horizontal deflection on TI crt.
(3) Adjust calibration adapter (A4) VARIABLE control for 4 major divisions of
vertical deflection on TI crt. If square-wave display does not have flat tops and square
corners, perform b(1) below.
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