Specifications

(3)
(4)
(5)
(6)
(7)
34
Figure 21. Fabrication of special test cables.
Use the Transistor Power Supply
721A and apply +5 volts dc to the
test probe.
Measure the voltage at connector
P7801-H with the ME-26B/U; ad-
just potentiometer R7803 for ap-
proximately +0.5 volt dc.
Measure the voltage of the emitter
of transistor Q7801 (ungrounded
side of potentiometer R7801) with
the ME-26B/U; adjust potentiom-
eter R7801 for approximately +1
volt dc .
Measure the 721A output with the
TS443/U; increase the output to
13.0 volts dc.
Measure voltage at the emitter of
transistor Q7801 with the ME-
(8)
(9)
(10)
26B/U; adjust potentiometer R7801
in the increasing voltage direction
until a sharp drop in voltages indi-
cates transistor Q7801 has trig-
gered. This should occur at
approximately +9.5 volts dc.
Reduce the output of the 721A to
zero, then carefully increase it to
10.5 volts dc as indicated by the
TS-443/U.
Measure the dc voltage at connec-
tor P7801-H with the ME-26B/U;
carefully a d just potentiometer
R7803 until a sudden drop in the
measured
voltage
indicates
GREEN indicator DS7902 has
switched on.
Reduce the output of the 721A to