TB 9-4931-491-24
a. Performance Check
NOTE
In (1) and (2) below, switching positive and negative offset
voltage is required to obtain the reference mark on the 50/mV
per division range.
(1) Connect oscilloscope to pin 2 of remote jack and chassis ground (fig. 4). Record
exact amplitude.
(2) Connect oscilloscope to pin 3 of remote jack and chassis ground (fig. 4). Record
exact amplitude.
(3) Connect oscilloscope to pin 10 of remote jack and chassis ground (fig. 4).
(4) If the positive and negative peaks do not agree precisely with recordings in (2)
and (3) above, perform b below.
(5) Connect oscilloscope to pin 15 of remote jack and chassis ground (fig. 4).
(6) If the positive and negative inverted peaks do not agree precisely with
recordings in (2) and (3) above, perform b below.
b. Adjustments
(1) Connect oscilloscope to pin 10 of remote jack and chassis ground (fig. 4).
(2) Adjust M1H CENT and SIZE (fig. 3) until the positive and negative peaks agree
precisely with recordings in a (2) and (3) above (R).
(3) Connect oscilloscope to pin 15 of remote jack and chassis ground (fig. 4).
(4) Adjust M2H R9 and M2H R13 (fig. 5) until the positive and negative peaks agree
precisely with recordings in (2) and (3) above (R).
(5) Repeat a (1) through (6) above to check for oscilloscope drift while adjustments
were being made.
17. Sweep Drive Voltage
a. Performance Check
(1) Position controls as listed in (a) through (d) below:
(a)
MODE switch to AF.
(b)
SWEEP WIDTH to min.
(c)
CENT FREQ to 250 MHz.
(d)
BAND switch to 1.
(2) Connect oscilloscope to M2H TP1 (fig. 5) and chassis ground.
(3) If indication on oscilloscope is not 0 V, perform b (1) below.
(4) Increase SWEEP WIDTH to max.
(5) If indication on oscilloscope is not 28 V p-p, perform b (2) below.
