TM 11-6625-2440-12
a. Preliminary Operations for Self-Test. Perform
indications or results of these actions are included in this
column. The following abbreviations are used in this
the following:
column:
(1) Verify the initial conditions and control
C-D (control-display unit)
settings as indicated in paragraph 3-4a.
EU (electronics unit)
(2) Verify that test set and ancillary test
DVM (voltmeter)
equipment are connected as shown in figure 2-2 (bridge
Scope (oscilloscope)
and recorder not used).
PAV (phase angle voltmenter)
(3) Turn on test set primary ac and dc power
(4) Reference column. Lists troubleshooting
sources.
paragraph relating to abnormal indications resulting from
(4) Turn on ancillary test equipment.
the actions in the procedure column.
NOTE
NOTE
Allow a 30-minute warmup for ancillary
The LATITUDE switch, located at the
test equipment.
b. Self-Test Chart Column Explanations.
An
rear of the electronics unit chassis, is set
to NORTH or SOUTH during installation
explanation of the information in each of the self-test
of the test set (para 2-5). This switch is
chart columns is as follows:
(1) Sequence No.
column.
set in accordance with the hemisphere in
Lists the
which the test site is located. In the
sequence in which the tests must be performed. The
procedures in the self-test chart below,
sequence number also serves as a cross-reference to
indications affected by the switch setting
procedures in the troubleshooting chart (para 4-16).
are given for both NORTH and SOUTH
(2) Item column. Specifies the circuit or
positions of the switch. The switch
function being tested.
setting should not be changed when
(3) Procedure column. Specifies the unit and
performing the self-test procedures, and
lists all action to be performed relating to specific
the indication that is not applicable
operations, observations, and records. The normal
should be disregarded.
c.
Self-Test Chart.
Seq
Item
Procedure
Reference
No.
a. Set C-D 115 VAC PRIMARY and 28 VDC
1
C-D blower ..........................
PRIMARY circuit breakers to ON.
b. Set C-D 115 VAC switch to ON. C-D blower
operates (audible )
a. Set EU 115 VAC APH, 26 VAC, SE HEAT, and
2
Primary power .....................
AMB HEAT circuit breakers to ON
b. Set EU SCAN SELECT switch to AC VOLTS
c. Set EU PLATFORM SCAN switch to positions,
indicated below, and observe PAV and
counter kor voltages and frequencies listed.
Switch
position
Voltage
(Hz)
1 115 ( 11.5)/0
400 ( 20)
2 115 ( 11.5)/240
400 ( 20)
3 115 ( 11.5)/120
400 ( 20)
3
26v, 400-Hz circuitry ...........
Set EU PLATFORM SCAN switch to 4, and observe
PAV for indication of 26 (+2) V/iO and counter
for an indication 400 ( 20) HZ.
a. Set EU PLATFORM SCAN switch to OFF.
4
Dc voltages .........................
b Set C-D 28 VDC switch to ON.
c. Observe the following:
(1) C-D 28 VDC, 115 VAC, and SELF-TEST in-
dicators light.
(2) C-D TEST SET indicator does not light.
(3) C-D anti EU ELAPSED TIME meters run.
a. Set EU SCAN SELECT switch to DISCRETES
5
Power supply voltages ........
b. Set EU TEST SET SCAN switch to positions
indicated below, and observe scope and DVM
for voltages listed.
Switch position
Voltage
1 + 5 ( 0.5)
2 + 15( 1.00)
3 - 15 ( 1.0)
Change 1 3-9
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