TM 5-6675-250-10
2-7. OPERATING PROCEDURE - Continued
SELF TEST
With the MODE SELECT switch (1) positioned to SELF TEST (2) and with the PWR ON indicator (3)
a.
illuminated, place the TEST SELECT switch (4) to SOURCE VOLTAGE (5).
Depress the PRESS TO TEST switch (6); verify that the TEST METER pointer (7) is positioned
b.
between 22 and 23 Vdc on the upper meter scale (8).
.
Place the TEST SELECT switch (4) to REG AC (9); verify that the TEST METER pointer (7) is posi-
c.
tioned in the green band (10) of the meter scale.
Repeat step c with the TEST SELECT switch (4) in the REG DC (11) and BIAS (12) positions.
d.
Place the TEST SELECT switch (4) to the SERVO CW position (13), verify that the theodolite rotates
e.
in a clockwise direction when looking down on the GRU and verify that the TEST METER pointer
(7) is positioned in the green band (10) of the meter scale.
f.
Place the TEST SELECT switch (4) to the SERVO CCW position (14). Verify that the theodolite
rotates in a counterclockwise direction when looking down on the GRU and verify that the TEST
METER pointer (7) is positioned in the green band (10) of the meter scale.
Place the TEST SELECT switch (4) in the SERVO CW (13) or SERVO CCW (14) position until the yel-
g.
Iow follow-up index mark on the theodolite mounting plate and output is near the center of the
servo operating range.
h.
Place TEST SELECT switch (4) to BRAKE (15); verify that the BRAKE ON indicator is illuminat-
ed.
Place TEST SELECT switch (4) to GYRO (17); verify that the TEST METER (18) indicates a zero
i.
reading. Release the PRESS TO TEST switch (6).
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