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Table 4-1. Replacement Parts List Leland Airborne Model
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TB-9-2920-225-34-1 100 AMP Regulator (Solid State) Manual
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FIGURE 5-1. 100 AMP solid state regulator checker.
TB 9-2920-225-34-1
CHAPTER 5
100 AMP REGULATOR CHECKER
5-1. Purpose. This checker is intended to provide
c. Advance the power supply voltage control
quick bench tests to determine the general condi-
and note the voltage when the regulator relay is
tion f the regulator. The checker is not intended
closed and the main circuit light comes on. This
to replace the authorized test stands which are
is the relay closing voltage.
necessary to determine the accurate operating
d. Advance the voltage to 20 volts. The field
condition of the regulator.
indicator light should come on if the regulator
switching transistors are functioning.
5-2. Construction. The regulator checker can be
e. Advance the voltage until the field light turns
locally fabricated using salvaged components. The
mini-ammeter is an optional feature and most any
off (maximum of 32 volts). The light should shut
meter can be used, provided it is shunted to give
off if the regulating and switching transistors are
midscale reading.
functioning correctly.
f. Adjust the power supply voltage to 28 volts,
5-3. Power Supply. The regulator checker is used
adjust the regulator voltage adjusting rheostat
in conjunction with a variableexternal power sup-
until the field indicator light turns off.
ply having the following characteristics:
g. If the regulator fails these checks, perform
a. Voltage range 0-32 volts DC minimum.
bench tests and repairs.
b. Current range must be at least 2 AMPS.
h. If the regulator passes these checks, perform
c. The output power must be well filtered.
final tests on the authorized test stand.
NOTE
5-5. Mini-Ammeter Operation. If the regulator
The 500 AMP test stands, external power
checker is equipped with the optional meter, the
supply is adequate if additional filtering
following additional data can be obtained.
is added.
a. Note the average regulator current draw
5-4. Operation.
from several regulators which are known to be in
good operating condition.
a. Connect the checker to the regulator to be
tested.
b. While performing the above, check if the
meter reading is higher than normal, check for
b. Connect power supply to the checker.
shorted components and circuit. If the reading is
CAUTION
lower than normal, check for open circuits and
Be sure proper polarity is maintained.
components.
5-1

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