TM 1-1510-225-10 3C-18 2.     To  skip  an  item,  press   SKIP.    Note that the red cursor moves to the next item     and     that     the     skipped     item remains displayed in green. 3.     To    return    to    an    unchecked    item, press  RCL.  The display will return to the first page containing an unchecked item, with that item displayed in red. 4.     When the last unchecked item in the emergency  procedure  is  checked  off and all previous items in the procedure   have   been   checked   and LINE is pressed, the word COMPLETE  is  printed  in  red  in  the center of the last available line on the last page of the procedure. (11)   Re-initialization.  If the checklist display is not    functioning    properly,    re-initialize    the    checklist operation as follows: 1.     Set rotary switch to OFF. 2.     Set    rotary    switch    to    any    desired INDEX or LIST position. 3.     Press  PAGE  push  button  to  display first page of chosen index or list. (12)   Auxiliary.  When the rotary switch on the control  unit  is  set  to   AUX,  the  interface  computer  is available for inputs from the auxiliary equipment. (13)   Pilot Entry Keyboard.    The  operator  may use a hand-held  keyboard,  Figure  3C-9, to enter data of  his  own  into  a  section  of  the  Data  NAV  system memories  for  display  on  the  Indicator.    Data  entered by    the    pilot    is    stored    in    a    memory    that    is    not permanent   in   the   same   sense   as   those   memories containing  the  airplane  checklists.    However,  the  non- permanent  memory  is  kept  alive  by  a  3.6-volt  nickel- cadmium  battery  that  recharges  each  time  the  Data NAV  system  is  turned  on.    Depending  upon  the state of  charge  and  the  storage  temperature,  the  battery could keep the pilot-entered data intact for as long as 6  months.    The  keyboard  coil-cord is plugged directly into    a    bulkhead-type    connector    mounted    for    pilot convenience.      The   bulkhead   connector,  in  turn,  is wired  by  way  of  the  aircraft  wiring  to  the  Data  NAV system. NOTE At  the  top  of  the  keyboard  unit  is  the  ON  / OFF   switch   that   controls   a   5-volt  input. Whenever the keyboard is being connected to,    or    disconnected    from,    the    aircraft connector,  this  switch  must  be  in  the  OFF position   to   prevent   possible   damage   to integrated circuits inside the keyboard. (a)  Keyboard Controls.  All controls used to  operate  the  keyboard  functions  are  located  on  the keyboard   panel.      The   keyboard   unit   has   45   keys consisting     of     26     alphabetics     (A     through     Z);     10 numerics   (0   through   9);   comma;   period;   dash   (–); backspace   (¬ );   forward   space   (® );   cursor   return (CR); space (SP); home cursor (HC); and mode.  The MODE  key  selects  either  the  data  entry  mode  or  the calculator mode. Alternate   functions   are   available   for   13   keys: Clear   ( CLR);   roll   up   (- );   clear   entry   (CLE);   enter (ENTER);   sign   change   (+/-);   exchange   (C ); delete line (DEL); set beginning of stack (SBS); beginning of stack (BOS); and the arithmetic operations (+, –, x, ÷).    The   alternate   functions,   operational   only   during   the calculator mode, display above the affected keys. 1.  ON/OFF Power Switch 2.  Data Entry Keyboard Figure 3C-9.  Pilot Entry Keyboard