TM 55-1510-222-10 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 annunciator (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 annunciator will extinguish, the STRAY   VOLTAGE   annunciator   will illuminate   and   then   will   extinguish when passing through the TS RESET position. 15.  On CHAFF dispenser assembly, ensure 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     tight     using     ball hexagonal  key  screwdriver  provided  in  test  set carrying case. NOTE • When  the  test  set  is  installed  on the   dispenser   assembly   and   28 volts  DC  aircraft  power  is  being 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. • On test set, TS PWR ON annunciator     (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  annunciators  on  test set.  Each annunciator will illuminate. NOTE Replace   any   annunciator   that   does not illuminate when pressed.  If none of the indicating annunciators illuminate, return test set to AVUM. 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. 19.  Press  pilot  CHAFF  DISPENSER  switch  once. Press copilot CHAFF DISPENSER switch once. On    DCP,    for    each    depressing,    the    CHAFF counter  should  count  down  by  an  increment  of one. 20.  On   DCP,   set   MAN-PGRM   switch   to   PGRM position. 21.  Press any one of CHAFF DISPENSER switches in   aircraft.      On   DCP,   the   number   shown   on CHAFF counter should decrease in accordance with the program set on the EM. 22.  Repeatedly   press   other   CHAFF   DISPENSER switch until CHAFF counter on DCP reads 00. 4-7