TM 5-6675-250-10
1-9. TECHNICAL PRINCIPLES OF OPERATION - Continued
(14) Test meter (14). Provides a visual indication of operational status of the instrument in both
testing and operating modes. Satisfactory operation of the circuits associated with TEST
SELECT switch position is indicated by the meter pointer. The meter and the TEST SELECT
switch are used in conjunction with the PRESS TO TEST switch, which must be actuated to
obtain meter indications during self-test operation. When the TEST SELECT switch is in the
SOURCE VOLTAGE position, the input voltage may be read on the voltage scale on the right
side of the meter scale. When the TEST SELECT switch is in the GYRO position, the meter
pointer should center in the yellow area. When the TEST SELECT switch is in any other posi-
tion, the meter pointer should be in the green area.
(15) Hand-lamp switch (15). Provided to turn the hand-lamp on or off.
(16) Hand-lamp connector (A2J1) (16). Connects the hand-lamp to the ECU.
(17) Input power connector (A2J2) (17).
Connects the ECU to the electrical power source.
(18) Interconnect connector (A2J3) (18).
Connects the GRU to the electronic control unit.
(19) Fuse holder (19). A receptacle for the 24 Vdc, 3 amp fuse, which protects the electric parts
from damage in the event of a power overload.
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