TM  5-6675-302-14&P Table 3-1. Operator/Crew Preventive Maintenance Checks and Services B-Before A-After M--Monthly D-During W-Weekly Procedures Item Interval Item To Be Check  for  and  have  repaired Equipment Is Not No. B    D  A  W    M Inspected or adjusted as necessary Ready/Available If 1 l Accessory   case Check for serviceability and presence of components. 2 l Battery  box Check for serviceability and presence of Faulty  batteries components.  Check  batteries  and  wiring for   serviceability.   Check   rheostat   for tight  and  clean  connections  and  proper operation. 3 l Head lamp Check for serviceability and operation. Bad lamp 4 l Tripod Check  for  serviceability. 5 l All  components Check   for   proper   function,   alignment, adjustment, and calibration. b. Interval Columns. The columns headed B, D, /Available  Column.  This  column  will  contain  the A, W, and M, will contain a dot (.) opposite the ap- criteria  which  will  cause  the  equipment  to  be propriate  check  indicating  it  is  to  be  performed classified  as  Not  Ready/Available  because  of  in- Before, During, After, Weekly or Monthly. ability to perform its primary mission. c.  Item  to  be  Inspected  Column.  The  items listed  in  this  column  are  divided  into  groups  and NOTE identifies the items to be inspected. If the equipment must be kept in con- d. Procedures Column.  This column contains a tinuous operation, check and service on- brief  description  of  the  procedure  by  which  the ly those items that can be checked and check is to be performed. serviced without disturbing operation. e. 3-6. Make the complete checks and services Equipment  will  be  Reported  Not  Ready when the equipment can be shutdown. Section  IV.  OPERATOR’S  MAINTENANCE General.  This  section  describes  maintenance c. Install  serviceable  lamps  in  the  illumination functions  which  the  operator  must  perform  on components of the target set. 3-7. Lamps, Illumination   Assembly   (Model 242406),  or  Screw-In  Lamp  Assembly  (Model USATS-79),  Replacement. a. Remove  and  replace  defective  lamp  from  the illumination  assembly  and  reflector  as  illustrated in  figure  3-1  for  model  242406,  or  from  screw-in lamp   assembly   and   reflector   as   illustrated   in figure 3-2 for model USATS-79. b. Clean  the  reflector  inner  surface  with  a  soft clean cloth. assembly   (model   242406),   or   screw-in   lamp assembly  (model  USATS-79). 3-8. Lamp, Eyepiece Adapter, Replacement. a. Remove  and  replace  defective  lamp  from  the eyepiece adapter as illustrated in figure 3-3. b. Install serviceable lamp in eyepiece adapter. 3-9. Lamp,  Handlamp  Assembly,  Replacement. a. Remove  and  replace  defective  lamp  from  the handlamp assembly as illustrated in figure 3-4 for model 242406, or figure 3-5 for model USATS-79. 3-2