TM 1-1510-223-10 NOTE Replace    any    annunciator    that    does    not illuminate   when   pressed.      If   none   of   the indicating    annunciators    illuminate,    return test set to AVUM (aviation unit maintenance). b. Rotate  TEST  SEQUENCE  switch clockwise  to  TS  RESET  position. No visual indication will occur. c. Rotate  TEST  SEQUENCE  switch clockwise    to    SV    SELF    TEST position. STRAY VOLTAGE annunciator (red) will illuminate. d. Rotate  TEST  SEQUENCE  switch clockwise    to    next    position,    TS RESET. STRAY VOLTAGE annunciator (red) will extinguish e. Rotate  TEST  SEQUENCE  switch clockwise to next position, STRAY VOLT. STRAY VOLTAGE annunciator (red) should not illuminate. f. Rotate  TEST  SEQUENCE  switch clockwise   to   next   position,   SYS NOT RESET.  SYS NOT RESET annunciator   (amber)   should   not illuminate. If annunciator illuminates,     press     and     release MANUAL SYSTEM RESET switch    and    SYS    NOT    RESET annunciator should then extinguish. NOTE When  the  MANUAL  SYSTEM  RESET  switch  is pressed  and  released,  and  28  volts  DC  power  is being   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 COMPL. h. Press pilot's CHAFF DISPENSER switch     once.          Press     copilot's CHAFF DISPENSER switch once. On   MFD,   for   each   depression, CHAFF counter should count down by an increment of one. i. On MFD, depress L3 line selector switch until PRGM appears. j. Depress pilot's CHAFF DISP switch   once.      On   MFD,   number shown  on  CHAFF  counter  should decrease by one. k. On    MFD,    depress    line    select switch L4 to set CHAFF to PRGM. l. Depress    copilot's    CHAFF    DISP switch   once.      On   MFD,   CHAFF counter will read 29 minus SALVO     COUNT     multiplied     by BURST  COUNT  as  displayed  on ASE setup page. m. Repeatedly    depress    a    CHAFF DISP  switch  until  CHAFF  counter reads 00 and ALL CHAFF EXPENDED is displayed on MFD. The DISPENSE COMPLETE lamp  (green)  on  test  set  shall  be illuminated. NOTE The  DISPENSER  COMP  lamp  may  fail  to illuminate  during  the  previous  step  due  to improper connection between the base plate and  breechplate.    If  this  happens,  remove and   reinstall   base   plate   to   ensure   proper connection  and  repeat  CHAFF  DISPENSE tests.    If  this  still  does  not  result  in  proper operation,  verify  the  C-F  selector  switch  is in the C position. 5. 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   annunciator   (amber)   will illuminate. b. Press and release MANUAL SYSTEM   RESET   switch.      SYS NOT RESET annunciator (amber) will    extinguish    and    DISPENSE COMPLETE    LAMP    will    remain illuminated. c. Reset  the  CHAFF  counter  to  30. ALL CHAFF EXPENDED shall not be   displayed   on   MFD.      Do   not depress MANUAL SYSTEM RESET switch. NOTE When     the     MANUAL     SYSTEM     RESET switch is pressed and released, and 28 volts DC  power  is  being  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. d. Rotate  TEST  SEQUENCE  switch counter-clockwise to STRAY VOLT position. STRAY VOLTAGE annunciator (red) should not illuminate. e. Rotate  TEST  SEQUENCE  switch counter-clockwise to START/HOME position. 4-8