TM 11-6625-539-14-4
GENERAL SUPPORT MAINTENANCE INSTRUCTIONS
GENERAL
Section I.
used in this equipment because of the variables
introduced by adjustable controls and variations
caused by the devices under test.
General support maintenance personnel are au-
thorized to perform all functions allocated to them
by the maintenance allocation chart, as well as
7-3. Waveforms
any functions normally assigned to lower cate-
The only significant waveform in the equipment is
gories of maintenance.
the 1-kHz square wave output which can be
checked at the base of transistor Q1 or Q2, using
7-2. Voltage and Resistance Measurements
an oscilloscope. The square wave should have an
Significant voltage and resistance measurements
amplitude of approximately 2.5 volts peak-to-peak
are impractical for checking transistor circuits
in the BETA function.
Section Il. GENERAL SUPPORT TOOLS AND EQUIPMENT
Test Equipment Required for General Support
Table 7-1.
Maintenance-Cont.
7-4. Tools
The following electronic components:
Three hi-polar transistors which, in combination, include
No tools are required other than normal hand-
the following characteristics:
tools to perform general support maintenance on
1-PNP type
1-NPN type
the test set.
1--with beta range of 1 to 100
1--with beta range of 100 to 1000
1--with beta range of 1000 to 10,000
7-5. Test Equipment
Three field effect transistors (FET), which, in combina-
tion, include the following characteristics:
Test equipment required to perform general sup-
1--N-channel type
port maintenance of the test set is listed in table
1-P-channel type
1--with GM range of 0 to 250
1--with GM range of 250 to 2500
1--with GM range of 2500 to 25,000
Four 1 percent tolerance resistors including:
Maintenance
1--100 ohm
Multimeter AN,/USM-223.
1--20 ohm
1--500 ohm
Ammeter ME-221/U.
1--4000 ohm
Resistor Decade ~M-16/U.
Four diodes including both silicon and germanium types.
Oscilloscope AN/281C.
GENERAL SUPPORT TROUBLESHOOTING
Section Ill.
7-6. General.
determine this by normal operation of the transis-
tor test set or by mocking up tests to check the
The test set is designed to perform a series of
function.
particular functions. These individual functions
are explained and illustrated in chapter 5. The
7-7. Fault Isolation
first step of logical troubleshooting is to determine
a. Check out the operation of the test set. If all
which functions are giving you trouble. You can
Change 1 7-1
