TM 5-6350-264-14&P-9 NAVELEX EE 181-AA-OMI-100/E121 DZ-204 T.O. 31S9-2FSS9-1-9 Section III.  GENERAL MAINTENANCE. 5-4.  MAINTENANCE ACTION.  The extent of direct    and    general    support    maintenance    is governed by the Maintenance Allocation Chart (MAC), Appendix B.  The MAC  authorizes  on- site   test   and   replacement   of   the   electronics assembly,    fuse    holder    assembly,    speaker, audible     output     transformer,     power     switch, tamper   switches,   power   transformer,   battery, capacitors,   and   connectors.      The   MAC   also authorizes  inspection  and  replacement  of  the fuse holder assembly, battery, and connectors. Periodic   testing   of   the   Audible   Alarm   is   not scheduled  because  the  J-SIIDS  is  maintained in continuous operation.  Cleaning the exterior of  equipment  cabinets  is  required  periodically to maintain equipment free of debris.  Maintain louvers in cabinet door and holes in face plate in an open and free condition. Section IV.  REMOVAL AND REPLACEMENT OF MAJOR COMPONENTS AND ASSEMBLIES WARNING Before  removing  any  components  turn off power switch S1.  After replacement of   components,   turn   on   power   switch S1. 5-5. REMOVAL AND INSTALLATION PROCEDURES. a.    To   remove   the   electronics   assembly, loosen   collar   on   connector   P2.      Turn metal tab 90 degrees and disconnect P2 from J2.  Tag and disconnect wires that run   from   terminal   boards   to   conduit. Slide     inner     enclosure     out     of     outer enclosure.      Place   inner   enclosure   on bench.    Remove  screws,  lock  washers and washers, and disconnect connector J2     from     P1.          Remove     electronics assembly mounting screws from rear of inner enclosure. b.    To     install,     position     new     electronics assembly    on    inner    enclosure.    Install mounting  screws  through  rear  of  inner enclosure.  Connect J1 to P1 and install screws,    lock    washers    and    washers. Slide inner enclosure into outer enclosure.  Route  wires  through  hole  in rear of inner enclosure. Connect wires   running   from   terminal   boards   to conduits.  Align notch on P2 with J2 and connect   P2   to   J2.      Lock   metal   tabs together and tighten collar on connector P2. c.    To   remove   speaker,   loosen   collar   on connector    P2.        Turn    metal    tab    90 degrees   and   disconnect   P2   from   J2. Tag and disconnect  wires  that  run  from terminal  boards  to  conduit.    Slide  inner enclosure out of outer enclosure.  Place inner  enclosure  on  bench.    Note  length and location of speaker wires. Disconnect   wires   from   terminal   board. Remove  mounting  screws  from  rear  of enclosure and remove speaker. d.    To   install   new   speaker,    cut    speaker wires  to  same  length  as  wires  on  old speaker.    Trim  insulation  from  1/8  inch (3.175  mm)  of  end  of  wires  and  install crimp lugs.  Insert mounting screws from rear of enclosure and tighten to secure. Connect wires to terminal boards. e.    To   remove   audio   output   transformer, note  length  and  location  of  transformer wires.        Disconnect    wires.        Remove mounting screws and lock washers, and remove transformer. 5-28