ARMY  TM  5-6675-238-14 MARINE CORPS TM 08839A-14/1 Table  8-6.1.  PADS  Test  Set  Self-Test  Procedure  Using  Tape  Reader,  Part  No.  877406-2  -  Continued Malfunction Test procedure Normal  indication indication/corrective action ac. ad. ae. af. ag. b. Adjust the rangefinder mechanism located  on  the  left  side  of  the TTY by typing RY and observing the  printout,  Adjust  the  range- finder  clockwise  until  the  TTY prints  other  than  RY.  Note  the position of the rangefinder dial. Now  turn  rangefinder  counter- clockwise and observe correct RY printout and continue in a coun- terclockwise  direction  until  other than RY is printed out. Note this position of the rangefinder dial. Set the rangefinder in the middle of the two extremes c.  If  TTY  still  does  not  print  out correctly, replace or repair TTY Turn  TTY  keyboard  MOTOR switch to OFF Press SELF TEST switch-indica- tor to off Press SELF TEST switch-indica- tor to on Press  MEMORY  LOAD,  RE- VERSE,   VERIFY   and   EXE- CUTE  switch-indicators  in  order given Press  and  release  PADS  ON/ OFF  and  ENTER  switch-indica- tors   simultaneously SELF  TEST  switch-indicator  goes off.  EXECUTE  switch-indicator lights.  FAILURE/ACTION  indi- cator  displays  77 SELF  TEST  switch-indicator  lights. IMU  FAIL/COMP  FAIL  indica- tor  remains  on.  Self-test  tape  may or  may  not  move  forward.  ON portion of   PADS   ON/OFF switch-indicator lights. EXECUTE switch-indicator  goes  off Each switch-indicator, except EXE- CUTE,  lights OFF   portion   of   PADS   ON/OFF switch-indicator   lights   and   ON portion  goes  off.  Self-test  tape runs   forward   and   then   stops. FAILURE/ACTION indicator displays  00  when  tape  stops SELF  TEST  switch-indicator  does not go off: a. Check SELF TEST switch-indica- tor   for   proper   operation   or shorted  wiring b. Replace A3 EXECUTE switch-indicator does not light:  Replace  buffer  unit,  then Al, and then A3 SELF  TEST  or  PADS  ON  switch- indicator does not light: Recheck step i because the self-test cannot proceed  unless  the  sequence  of step i was completed correctly A  switch-indicator  does  not  light when pressed: Check the specific switch-indicator for continuity Self-test tape does not run forward: a.  Check  each  switch-indicator  or switch  for  proper  operation,  re- place if defective b. Replace A3 c. Replace A1 d. Replace A2 Change  1 8-54.11