a. Oscillator Negative Pulse Check.
(1) Set the ON/TRIPPED OFF circuit breaker (figure 1-9, item
23) to TRIPPED OFF.
(2) Remove the AC power cable assembly (figure 1-9, item 2)
from the PWR jack (figure 1-9, item 26).
(3) Remove the LR Tester from the base.
(4) Connect the AC power cable assembly on the PWR jack.
(5) Set the ON/TRIPPED OFF circuit breaker to ON.
(6) Connect the oscilloscope ground lead to the ground terminal
(figure 1-9, item 11).
(7) Connect a probe to the channel A input connector on the
oscilloscope.
(8) Set the MODE switch (figure 1-9, item 17) to RCVR 1 PULSE.
(9) Touch the channel A probe to TP2 (figure 1-19).
(10) The waveform should be as shown in figure 1-20, part A.
(11) Set the ON/TRIPPED OFF circuit breaker to TRIPPED OFF.
(12) Remove the probes from the test point and the ground
terminal.
b. Two-Targets, One-Shot Pulse Check.
(1) Set the ON/TRIPPED OFF circuit breaker (figure 1-9, item
23) to TRIPPED OFF.
(2) Remove the AC power cable assembly (figure 1-9, item 2)
from the PWR jack (figure 1-9, item 26).
(3) Remove the LR Tester from the base.
(4) Connect the AC power cable assembly on the PWR jack.
(5) Set the ON/TRIPPED OFF circuit breaker to ON.
(6) Connect the oscilloscope ground lead to the ground terminal
(figure 1-9, item 11).
(7) Connect a probe to the channel A input connector on the
oscilloscope.
(8) Set the MODE switch (figure 1-9, item 17) to RCVR 1 PULSE.
(9) Touch the channel A probe to TP3 (figure 1-19).
(10) The waveform should be as shown in figure 1-20, part B.
(11) Set the ON/TRIPPED OFF circuit breaker to TRIPPED OFF.
(12) Remove the probes from the test point and the ground
terminal.
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OD1716
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