ARMY TM 5-6675-238-14 MARINE CORPS TM 08839A-14/1 CHAPTER 3 OPERATING INSTRUCTIONS Section I. CONTROLS AND INSTRUMENTS 3-1.  General.  This  section  describes  the  function  of  the 3-3.  Controls  and  Indicators.   The  PADS  test  set  con- PADS  test  set  operator  controls  and  indicators. trols,  indicators,  and  connectors  are  illustrated  in  figures 3-1  thru  3-3.  Table  3-1  lists  the  contros,  indicators,  and 3-2.  Damage  from  Improper  Setting.  No   combination connectors  with  functional  descriptions. of   control   settings   will   cause   damage   to   equipment   or create  hazard  to  personnel. Section Il. OPERATION UNDER USUAL CONDITIONS 3-4. General.  The  PADS  test  set  is  operated  normally  to test   and   troubleshoot   the   PADS   computer,   CDU,   and IMU  and  to  perform  a  self-test  of  the  test  set.  Operation for   performing   test   and   troubleshooting   procedures   on the  PADS  equipment  is  contained  in  the  PADS  mainte- nance   manual   TM   5-6675-308-34   or   TM   08837A-34/ 2).   A   teletypewriter   is   used   with   the   PADS   test   set during   testing   and   troubleshooting   of   the   PADS.   For complete  operation  of  the  teletypewriter,  refer  to  chap- ter  9  and  TM  11-5815-200-12.  Under  normal  conditions, self-test  of  the  PADS  test  set  should  be  performed  after installation,  monthly  when  in  continuous  use,  before each  PADS  test  when  used  every  other  day,  or  when  the PADS   test   set   operational   status   is   questionable.   The following   paragraphs   contain   operating   procedures   for preparing  the  PADS  test  set  to  run  the  self-test  proce- dure  contained  in  chapter  8. 3-5.  Operating  Procedure.  Since the PADS test set is a special   purpose   test   set,   the   operating   procedures   are included   with   the   test   procedures   for   the   PADS   com- puter,   CDU,   and   IMU   in   TM   5-6675-308-34   or   TM 08837A-34/2.  In  addition,  turnon  and  turnoff  of  the PADS  test  set  is  included  in  the  test  procedures  in  this manual. 3-6.  Tape  Reader,  Part  No.  877406-1,  Tape  Loading. See figure 3-2 and perform the following: Do  not  physically  restrain  the  tape  reader tape   reel   from   turning.   Do   not   use   any kind  of  adhesive  tape  to  hold  the  tape onto   the   reel   being   loaded.   Do   not   use deformed   tape   reels.   Severe   damage   to the  tape  reader  servo  cards  may  result. a.  Ensure   that   tape   reader   SPOOLING   switch   is set  to  DISABLE. b.  Install  self-test  tape  (left)  and  take-up  reel  (right) and  fasten  reel  locking  clips. c.   Route   self-test   tape   carefully   as   shown   in   figure 3-2. 3-6.1  Tape  Reader,  Part  No.  877406-2,  Tape  Loading. See figure 3-2.1 and perform the following: a. Lift  read  head  cover  to  up  position. b.   Load   self-test   tape   on   left   side,   thread   tape through  read  head  ensuring  that  tape  is  between  LED’s and  read  head,  and  sprocket  teeth  are  aligned  on  both sides. c.   Manually   move   tape   until   arrows   on   tape   are past  read  head. d.   Gently   lower   read   head   cover.   Tape   reader   has now  recorded  this  as  HOME. e.   Wrap   tape   around   take-up   reel.   Ensure   that   tape has been threaded as shown in figure 3-2.1. 3-7.  IMU/Computer/CDU  Testing  Concepts.  T he PADS  test  set  is  utilized  to  check  out  the  PADS  on  a system   level   as   well   as   checking   out   the   IMU,   com- puter,  and  CDU  on  an  individual  basis  with  an  opera- tional   PADS   power   supply   and   teletypewriter   con- nected.  To  perform  IMU  and  CDU  checkout,  an  opera- tional  computer,  power  supply,  and  teletypewriter  must be   connected   to   the   PADS   test   set.   The   computer   is tested   by   loading   a   diagnostic   program   into   the   com- puter  memory,  then  performing  the  necessary  tests,  the results   of   which   are   printed   out   on   the   teletypewriter. During   computer   testing   a   malfunction   can   be   isolated to  a  plug-in  module.  In  addition,  the  PADS  test  set  is Change 1 3-1