TM 1-1510-225-10 3C-19 To    prevent    electromagnetic    radiation    in ramp,    terminal,    taxiway,    or    other    areas occupied by personnel, operate radar only in STANDBY mode. CAUTION Pilot entry keyboard ON / OFF Switch must be  in  OFF  position  whenever  keyboard  is being connected to, or being disconnected from, aircraft connector. Do    not    operate    radar    system,    even    in STANDBY  Mode,  without  115-Vac,  400-Hz power  applied  to  the  system.    Without  ac power, the receiver/transmitter/cooling blower will not operate, which could result in circuit damage and/or automatic shutdown. (14)   Keyboard Operation. After turning on the radar,  set  the  rotary  switch  on  the  Data  NAV  Control Unit to EMER INDEX.    1.     Slide keyboard   ON  /  OFF  Switch  to ON. 2.     Use  PAGE  buttons  and   LINE  push buttons, if necessary, to place cursor on PILOT INPUT line of index. 3.     Set    rotary    switch    to    EMER    LIST position    to    display    PILOT    INPUT page. (15)   Page   Sequencing.        The    PAGE    push button  must  be  used  to  advance  to  each  page  of  the pilot  input  and  to  cycle  back  to  the  first  page.    All keyboard actions are limited to the currently displayed page. There is no automatic paging to the previous or next  page  with  cursor  movement  or  by  means  of  the ®, ¬, or CR keys. (16)   Mode    Assignment.        By    use    of    the keyboard MODE key, a mode can be chosen for each pilot-input   page.      For   instance,   the   pilot   can   select Data Entry mode for page 1; advance to page  2 and select  Data  Entry  mode;  and  advance  to  page  3  and select    Calculator    mode    for    page    3.        The    mode assignment    is    retained    for    each    page    as    page advancing occurs. When power is first applied to the radar system, the pilot-input pages are cleared and each  page is set to  the  data  entry  mode,  unless  data  has  previously been entered, in which case the memory is preserved and  not  cleared.    Successively  pressing  the   MODE key   alternates   the   mode   between   data   entry   and calculator. (17)   Exit And Return To Keyboard Operation.   Checklist   operation   can   be   resumed   by   setting   the rotary switch to  NORM INDEX /  NORM LIST /  EMER INDEX.    When  keyboard  operation  is  again  selected, the  screen  returns  to  the  same  display  conditions  that prevailed prior to leaving the keyboard operation. NOTE To   clear   the   screen,   enter   the   calculator mode and press the CLR key.  This two-key operation   is   a   deliberate   requirement   to avoid an accidental clearing of the screen. (18)   Detailed   Operation.    The  keyboard  unit can   be   operated   in   two   modes:   data   entry   and calculator.        In    the    data    entry    mode,    the    unit    is essentially  used  as  a  typewriter;  press  a  key  and  the key   symbol   is   displayed   on   the   screen.      In   the calculator mode, arithmetic operations can be performed and the results saved. (19)   Data Entry Mode.  Data can be entered in columns  2  through  21  on  lines  3  through  12.    This data-entry region contains a maximum of 10 lines with 20 characters per line.  Data is entered at the location on  the  screen  where  the  cursor  is  positioned.    When keyboard   operation   is   selected,   the   first   pilot-input page is displayed with the cursor positioned to column 2, line 3. The  keyboard  cursor  displays  only  in  the  data entry  mode.    It  is  a  small  horizontal  blue  line  where there   are   no   characters,   but   when   it   resides   on   a character, it changes the color of the character to blue. Pressing any of the alphabetic, numeric, comma, period,  dash,  or  space  keys,  will  make  that  character display   in   the   cursor   position   and   the   cursor   will advance  to  the  next  character  location  on  the  line.   If the  cursor  was  in  the  last  location  of  a  line,  it  will advance  to  the  start  of  the  next  line  in  the  data  entry region.  If the cursor was in the last location of the last line,  it  will  advance  to  the  start  of  the  first  line  in  the data entry-region. Each time the   ®   key  is  pressed,  the  cursor  is advanced to the next location.  Each time the ¬  key is pressed,   the   cursor   is   backspaced   to   the   previous location.  If  the  cursor  was  at  the  start  of  a  line,  it  will backspace  to  the  last  location  of  the  previous  line.  If the  cursor  was  at  the  start  of  the  first  line  in  the  data entry  region,  it  will  backspace  to  the  last  location  on the last line. WARNING