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TM  5-4120-377-14 (3) Measure voltage between pin D of connector P1 If  more  than  zero  voltage  is  observed,  disconnect  cable source  or  at  cable  connection  as  indicated. and a good chassis ground. Voltage must be zero (0). and  check  power  source,  Correct  problem  at  power (4)  With  zero  voltage  on  pin  D  of  P1  connector,  check  voltages  between  remaining  pins  as  shown  on following   chart. P1  CONNECTOR Measure To Pin from Pin A B C D A N/A 208 208 120 B 208 N/A 208 120 C 208 208 N/A 120 D 120 120 120 N/A Voltages  should  be  approximately  as  shown.  If  voltages  are  not  within  ten  volts  of  those  indicated  on  chart, disconnect  power.  Locate  and  correct  problem. Check  that  mode  selector  switch  is  OFF. (5)  After  proper  voltages  are  indicated  on  all  pins  of  connector  P1,  connect  P1  to  connector  J1  on  air conditioner. NOTE The following steps require two people. One must be at control panel. The other must be in position at rear of air conditioner to see condenser fan rotation. (Condenser fan can be seen  through  condenser  air  outlet  grille,  figure  1-2,  item  16.) (6)  The  person  at  control  panel  should  turn  mode  selector  switch  to  VENT  and  immediately  back  to  OFF. (7)  The  person  at  rear  of  unit  should  watch  condenser  fan  to  determine  direction  of  rotation.  Fan  blades must  turn  toward  grille. (8)  If  fan  blades  turn  away  from  grille,  unit  power  cable  is  not  connected  properly.  Exchange  wires connected  to  pins  A  and  B  at  power  source  connection  and  repeat  steps  (6)  and  (7)  above. (9)  Check  unit  operation  in  accordance  with  para  2-6  and  2-7. i.  See  air  conditioner  wiring  diagram,  figure  4-20,  and  electrical  schematic,  figure  4-20A,  for  additional wiring  information. 4-24

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