TM  55-1510-221-10 illuminates,   press   and   release   MAN- UAL SYSTEM RESET switch and SYS NOT  RESET  lamp  should  then  extin- guish. NOTE When   the   MANUAL   SYSTEM   RESET switch  is  pressed  and  released,  and  28 volts   DC   power   has   been   applied,   the sequencer   switch   inside   the   dispenser assembly  resets,  making  an  audible  sound as  it  rotates.  If  the  sequencer  switch  has been  previously  reset  or  if  the  switch  is  in position  12  or  24,  there  will  be  no  such sound. g. Rotate  TEST  SEQUENCE  switch clockwise   to   next   position, DISP COMP. 12.  Press  FLARE  DISP  switch  once.  For  each depressing,  the  FLARE  counter  on  DCP should  count  down  in  groups  of  three. 13. On  DCP,  raise  RIPPLE  FIRE  switch  guard and  set  toggle  switch  to  up  position  until FLARE  counter  counts  down  to  00.  Return switch  guard  to  down  position.  On  DCP, reset   FLARE   counter   back   to   30.   DIS- PENSER  COMPLETE  lamp  (green)  on  test set  will  illuminate. 14.   Perform   the   following   operations   on   the M-91  test  set: a. Rotate  TEST  SEQUENCE  switch counter-clockwise  to  SYS  NOT  RESET position.  SYS  NOT  RESET  lamp (amber)   will   illuminate.   DISPENSER COMPLETE  lamp  (green)  will  remain illuminated. b.   Press   and   release   MANUAL   SYSTEM RESET switch. SYS NOT RESET lamp (amber)  will  extinguish. NOTE When  the  MANUAL  SYSTEM  RESET switch  is  pressed  and  released,  and  28 volts  DC  power  has  been  applied,  the sequencer   switch   inside   the   dispenser assembly  resets,  making  an  audible  sound as  it  rotates.  If  the  sequencer  switch  has been  previously  reset  or  if  the  switch  is  in position  12  or  24,  there  will  be  no  such sound. c. Rotate  TEST  SEQUENCE  switch counterclockwise   to   STRAY   VOLT position.   STRAY   VOLTAGE   lamp (red)  should  not  illuminate. d.  Rotate  TEST  SEQUENCE  switch counterclockwise   to   START/HOME position. NOTE When  the  TEST  SEQUENCE  switch  is turned   to   the   START/HOME   position, the   DISPENSER   COMPLETE   lamp   will extinguish,  the  STRAY  VOLTAGE  lamp will  illuminate  and  then  will  extinguish when  passing  through  the  TS  RESET position. 15. On  CHAFF  dispenser  assembly,  assure  that C-F  selector  switch  is  in  C  (chaff)  position. 16.  Remove  M-91  test  set  from  first  dispenser assembly. 17. Connect  M-91  test  set  to  breech  assembly  of second   dispenser   assembly.   Secure   both mounting   studs   uniformly   hand   tight   using ball   hexagonal   key   screwdriver   provided   in test  set  carrying  case. NOTE When  the  test  set  is  installed  on  the  dis- penser  assembly  and  28  volts  DC  aircraft power  has  been  applied,  the  sequence switch   inside   the   dispenser   assembly resets,  making  an  audible  sound  as  it rotates.  There  will  be  no  such  sound  if  the sequencer   switch   has   been   previously reset  or  if  switch  is  in  position  12  or  24. NOTE On  test  set,  TS  PWR  ON  lamp  (clear) illuminates   and   remains   illuminated through   the   test   sequence   until   aircraft power to test set (via test set power cable) is  disconnected  or  shut  off. 18.   Perform   the   following   operations   on   the M-91 test set: a. Press  to  test  all  four  lamps  on  test  set. Each  lamp  will  illuminate. 4-7