TB 9-6625-1176-24
b. Adjustments
NOTE
It might be necessary to set the LEVEL vernier slightly off
center position to get trigger on NEG and POS SLOPE. The
arrow of knob should stay within 1 mm of center position.
(1) Adjust function/arbitrary generator to 100 kHz and 300 mV p-p display
indication on oscilloscope.
(2) Set EXT INPUT LEVEL control to midrange.
(3) Adjust R19 (fig. 1) until output pulses appear on the oscilloscope.
(4) Repeat technique of (3) above with SLOPE switch set to NEG.
14. Power Supply
a. Performance Check
(1) Position controls as listed in (a) through (e) below:
AMPLITUDE 3-10 pushbutton pressed.
(a)
POLARITY switch to NEG.
(b)
MODE EXT TRIG pushbutton pressed.
(c)
DUTY CYCLE % pushbutton released (out).
(d)
DELAY/ADVANCE DOUBLE PULSE switch to DELAY.
(e)
(2) Connect negative input of multimeter to TP7 (fig. 7) and positive input to TP1
(fig. 7). Multimeter will indicate approximately 155 V. Record multimeter indication.
(3) Move positive lead to TP5 (fig. 7). Multimeter will indicate approximately 133 V dc.
If the difference between indication recorded in (2) above and this indication is not between
21.780 and 22.220 V dc, perform b below.
(4) Press AMPLITUDE 30-100 pushbutton.
will
indicate
approximately 263 V dc at TP1 and approximately 241 V dc at TP5.
Figure 7. A4 power supply board - top left center.
