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SECTION  II SPECIFIC   INSTRUMENTS
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TM-750-116 Topographic Support System (TSS) Downsized Direct Support Section (DDSS) Manual
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Figure   3-5   Cant   Angle   Sensor
TM   750-116 3-4.  COLLIMATOR,  M1A1  (fig.  3-3). HANDLE WITH CARE. IN THE EVENT THE RADIOLUMINOUS SOURCE IS BROKEN,  CRACKED,  OR  SUDDENLY LOSES ILLUMINATION, DO NOT AT- TEMPT TO REPAIR. IMMEDIATELY DOUBLE WRAP INSTRUMENT IN PLAS- TIC AND NOTIFY THE LOCAL RADI- ATION PROTECTION OFFICER (RPO). F i g u r e    3 - 3    M 1 A 1    C o l l i m a t o r NOTE Actual location of outlet port screws may vary from location shown in illustration due to coli- mator adjustments. a. b. c. NOTE For sealing the collimator, the two stage fixture is  required  (refer  to  para  2-2.b.).   For   regular purging and charging, the single stage fixture may be used (refer to para 2-2.a.). Perform purging and charging procedure para 2-5.b. Purge instrument at 3 psig for 5 minutes. Check to be sure nitrogen is escaping from both out- let ports. d. Charge  instrument  at  3  psig  maintaining  pressure  for 10 seconds. e. Leak test for a minimum of 5 minutes. f. Remove hose assembly and release all pressure by depressing inlet port valve stem. g. Reconnect hose assembly and charge instrument at 1 psig  for  10  seconds. h. Install  inlet  port  cap. 3-5.  COMPUTER,  M21  ELECTRONIC (figs.  3-4  through  3-9). a. Ammo Select Unit - two each (fig. 3-4). . . . . . . \ Figure  3-4  Ammo  Select  Unit (1) Perform  purging  and  charging  procedure  para 2-5.b. (2) Purge  each  unit  at  8  psig  for  5  minutes. (3) Charge  each  unit  at  1  psig  maintaining  pressure for 10 seconds. (4) Leak  test  for  a  minimum  of  5  minutes. 3-3

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