TM 55-4920-429-13
b. Connect external power to the test set as follows: (See FO-8 for connector pin patterns.)
(1) J1-B
Line
115Vac 400Hz
(2) J1-D
Neutral
(3) J1-A
+
28Vdc
(4) J1-C
(5) J1-E
28VDC Cyclic
+
(6) J1-C
Trim Power
c. Unless otherwise indicated in the specific test instruction, set the controls and switches to their
initial positions as listed in table 2-2.
d. Turn on external power to the test set. At the MASTER power panel, the CYCLIC TRIM 28VDC
indicator shall come on.
e. Set the 115VAC switch to ON. The 115VAC indicator shall come on.
f. Set the 28VDC switch to ON. The 28VDC indicator shall come on.
g. Set both MASTER POWER switches to OFF.
4-29. Self Test and Power Supply Tests.
The following tests check operation of the self test cir-
cuits. In addition, they ensure correct output of internal power supplies.
a. Multimeter Zero Test. Set both MASTER POWER switches to ON. Set the METER SOURCE
switch to OFF. The VDC indicator shall come on. The digital multimeter (dmm) shall read +0.005 to
-0.005. The analog meter shall read 0 ± 1 scale division.
b. Continuity Test. Set the METER SOURCE switch to CONTINUITY. The K-OHMS indicator
shall come on and the VDC indicator shall go out. The dmm shall read +9.77 to +10.23.
c. Lamp Test.
(1) Set the SELF TEST switch to LAMPS. The SIGNAL MONITOR, STATUS A, and STATUS B
indicators shall come on. The MULTIMETER, VDC, VAC, and K-OHMS indicators shall come on.
(2) Cycle the DISPLAY switch between BRIGHT and DIM. Lighted indicators and the dmm
shall cycle between bright and dim.
d. DMM Display Test.
Set the SELF TEST switch to DISPLAY. The dmm shall read +.8.8.8.8. All display segments shall
be lit.
e. Power Supply Tests.
(1) Set the METER SOURCE switch to SELF TEST.
(2) Connect the digital multimeter across the HI (+) and LO binding posts.
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