TM 5-6675-250-10
2-1. OPERATOR'S CONTROLS AND INDICATORS - Continued
(10) Bias lock (10). The BIAS LOCK
mechanically holds the BIAS CON-
TROL in the set position to prevent
an accidental movement.
(11) Read azimuth indicator (11). The
READ AZIMUTH indicator is illumi-
n a t e d when true north has been
obtained; light is applied automati-
cally to the theodolite scale for azi-
muth reading.
(12) Gyro sync indicator (12). Illumination
of the GYRO SYNC indicator indi-
cates that the gyro motor has
attained synchronous speed. When
the GYRO SYNC indicator illuminates
the CAGE-UNCAGE knob on the GRU,
the GRU is to be rotated to UNCAGE
(clockwise rotation). Under normal
o p e r a t i n g conditions, in tempera-
tures above 15F (-9.4C), the GYRO
SYNC indicator illuminates two min-
utes after the instrument is ener-
gized.
2-14
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