TM 11-5840-281-12-1
3-5. DEHYDRATOR CARTRIDGE INSPECTION. (CONT)
Three dehydrator cartridges (1) and their adapters (2) are located in three waveguides on the radar set group. These
cartridges are replaceable and contain a desiccant (moisture absorbing material) that reduces moisture content within the
waveguides. The desiccant is normally blue in color, but gradually loses its effectiveness and turns pink as it absorbs
moisture. Replace the dehydrator cartridges when there is no trace of blue in the desiccant or when the color is definitely
pink. Notify organizational maintenance when replacement is indicated by performance of the operator's weekly
preventive maintenance checks and services.
3-6. OPERATIONAL CHECK.
Operational checks are used as a check to determine serviceability of radar set. The checks are performed after
installation, and periodically as prescribed in organizational PMCS table. If a malfunction is found during a step in the
operational check, report the problem to organizational maintenance personnel. The faulty part can then be isolated,
tested, and repaired or replaced as necessary. Once corrective action has been taken, operational checks are performed
again. Operational checks are divided into three parts. The first part checks the performance of receiver-transmitter and
is performed at radar site. The second part checks master and slave control-indicator's performance. The third part
checks operation of radar set group as a whole using operational controls on master control-indicator.
PRELIMINARY CONTROL SETTINGS
Before performing operational checks, make preliminary control settings as follows.
1. On both control-indicators, place the following controls to positions indicated:
CONTROL
POSITION
INTENSITY control
fully counterclockwise
FOCUS control
fully counterclockwise
POWER switch
OFF
TRANSMITTER switch
OFF
IF GAIN AZ and EL controls
fully counterclockwise
STC switch
OFF
FTC switch
OFF
PPI CENTERING NORM-OFFSET control
NORM
EL TARGET control
WIDE
VIDEO GAIN control
fully counterclockwise
2. On each pulse generator, place the following controls to positions indicated:
CONTROL
POSITION
SCAN MODE switch
SEARCH
SCAN switch
OFF
EL CURSOR switch
GP
ANGLE VOLTS switch
OPERATE
ART ANGLE V control
fully counterclockwise
RANGE MILES switch
40
ALTITUDE control
fully counterclockwise
3-11
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