TM  5-6675-317-14 Table 6-1. OPERATOR   PREVENTIVE   MAINTENANCE   CHECKS   AND   SERVICES   -   Cent B   -   Before W   -   Weekly AN   -   Annually (Number) D   -   During M   -   Monthly -   Hundreds   of   Hours s - Semiannually A   -   After Q   -   Quarterly BI -   Biennially ITEM NO. 1 lN- TER. VAL B ITEM   TO   BE   INSPECTED PROCEDURE POCKET   CALCULATOR   -   Cont INSPECT - Cont 2. 3. 4. Connect  ac  adapter/recharger  to  calcu- lator and plug in. Turn calculator on. Press   ~  and  = Display  should indicate -8, 8, 8, 8, 8, 8, 8, 8, 8, 8. With  battery  pack  in  calculator,  check operation to be sure calculator turns on. Remove battery pack and check for clean contacts. Wipe clean. Reinstall bat- tery  pack. Check power cord for kinks, frays or burns. 6-6.  OPERATION  UNDER  USUAL  CONDITIONS. For   Readiness Reporting, Equipment    Is Not   Ready/ Available   if: Display does Not show - 8, 8,8, 8, 8, 8, 8, 8, 8, 8. Battery  pack is defective. Power cord is damaged. 6-6.1  Operating  Procedure. a. Selecting a function. NOTE Most keys on the keyboard perform three functions. One function is indi- cated by symbol on top of key, second is above key, and third is on slan- ted face of key. (1) TO select a function printed on the key, press the key. (2) TO select a function printed above the key, press key q ,  then  function key. Example: To use LOG in calculation, enter number, q then LOG. (3) To select a function printed on slanted face of key, press q then function key. Example: TO use @l in calculations, enter number, q then q _l 6-23