TM 55-1510-219-10 NOTE When  the  test  set  is  installed  on the   dispenser   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. NOTE Replace  any  lamp  that  does  not illuminate  when  pressed.    If  none of the indicating lamps 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   lamp (red) will illuminate. d. Rotate   TEST   SEQUENCE   switch clockwise     to     next     position,     TS RESET.   STRAY   VOLTAGE   lamp (red) will extinguish. e. Rotate   TEST   SEQUENCE   switch clockwise  to  next  position,  STRAY VOLT.      STRAY   VOLTAGE   lamp (red) should not illuminate. f. Rotate   TEST   SEQUENCE   switch clockwise    to    next    position,    SYS NOT   RESET.      SYS   NOT   RESET lamp (amber) should not illuminate. If lamp illuminates, press and release  MANUAL  SYSTEM  RESET switch  and  SYS  NOT  RESET  lamp should then 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. g. Rotate   TEST   SEQUENCE   switch clockwise    to    next    position,    DISP COMPL. 19. Press  pilot  CHAFF  DISP  switch  once.    Press copilot CHAFF DISP switch once.  On DCP, for each   depressing,   the   CHAFF   counter   should count down by an increment of one. 20. On   DCP,   set   MAN-PRGM   switch   to   PRGM position. 21. Press   any   one   of   CHAFF   DISP   switches   in aircraft.  In DCP, the number shown on CHAFF counter should decrease in accordance with the program set on the EM. 22. Repeatedly    press    other    CHAFF    DISPENSE switch until CHAFF counter on DCP reads 00. 23. On  test set, observe  DISPENSE  COMPLETE lamp (green) is illuminated and then perform the following operations: a. Rotate   TEST   SEQUENCE   switch counter-clockwise to SYS NOT RESET position.  SYS NOT RESET lamp (amber) will illuminate. 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 counter-clockwise  to  STRAY  VOLT position.    STRAY  VOLTAGE  lamp (red) should not illuminate. 4-8