TM 55-4920-402-13&P NOTE Soldering  Techniques.  Use  a  stiff,  non- metallic  bristle  brush  to  clean  anti- fungus  material  away  from  area  to  be unsoldered   and   soldering   iron   between 25  and  40  watts  (600  to  900  degrees  F). Do  not  exceed  40  watts.  Use  resolder- ing  equipment,  such  as  a  solder  sucker, while   unsoldering   parts   and   heat   sinks on  transistor  or  diode  leads  when soldering   or   unsoldering.   Use   solder per   Federal   Specification   QQ-S-571D. Apply   anti-fungus   material   (MIL-STD- 1250)  after  completion  of  repairs. NOTE Circuit   Card   Repair.   Special   soldering equipment  is  needed  for  solid  state components;   i.e.,   microcircuits, transducers   and   semiconductors   that can  be  easily  damaged  by  excessive heat.   Repairs   to   the   Balancer   circuit cards  are  made  with  the  cards  in  place. The  Strobex  circuit  card  may  be removed  for  repair.  The  following  in- structions,   and   those   in   the   preceding paragraph,   are   applicable   to   the Balancer   circuit   cards   and   the   Strobex circuit   card. 4-20.   Adjustment   Procedures.   Perform   these procedures  only  when  directed  by  the troubleshooting  procedure  (Table  4-17),  or paragraph  4-11d  (16). a,   Balancer   Adjustments.   Perform   these   pro- cedures  only  when  directed  by  the troubleshooting  procedures  (Table  4-17),  or paragraph  4-11d  (16). (1)  Connect  Balancer  and  test  equipment  as shown  in  Figure  4-6. (2)  Set  Balancer  FUNCTION  switch  to TRACK,  R.P.M.  RANGE  switch  to  X10,  and R.P.M.  TUNE  dial  to  100. (3)  Remove  cover  by  removing  4  screws. (4)  Connect  VOM  between  TP2  and  ground, and  adjust  R152  for  a  0  ±  3  mV  indication. (5) Connect VOM between TP3 (Fig. 4-5) and  ground,  and  adjust  R152  for  a  0  ±  3  mV  in- dication. 4-16 Change  4 (6)  Set  FUNCTION  switch  to  B  and  R.P.M. TUNE  dial  to  past  999  to  000. (7)  Set  up  function  generator  for  a  sine  wave output  of  166.67  Hz  at  115  mV  rms. (8)  Connect  oscilloscope  horizontal  input  to TP8  and  vertical  input  to  TP2. (9)  Press  and  hold  VERIFY  TUNE  switch and  adjusat  R114  for  a  90°  phase  shift  display (circle).  Release  switch. (10)  Connect  oscilloscope  vertical  input  to TP3. (11)  Press  and  hold  VERIFY  TUNE  switch and  adjust  135  for  a  90°  phase  shift  display  (cir- cle).  Release  switch.  Repeat  steps  (9)  thru  (11)  for optimum   adjustment. (12)  Adjust  R155  until  IPS  meter  indicates full  scale. (13)  Set  R.P.M.  TUNE  dial  to  100. (14)  Set  up  function  generator  for  a  16.67 Hz  sine  wave  output  at  11.5  mV  rms. (15)  Connect  oscilloscope  horizontal  input to  TP8  and  vertical  input  to  TP2. (16)  Press  and  hold  VERIFY  TUNE  switch and  adjust  R126  for  a  90°  phase  shift  display (circles).  Release  switch. (17)  Connect  oscilloscope  vertical  input  to TP3. (18)   Press   and   hold   VERIFY   TUNE switch  and  adjust  R148  for  a  90°  phase  shift display  (circles),  Release  switch.  Repeat  steps (16)  thru  (18)  for  optimum  adjustment. (19)    Position Balancer   and   function generator   controls   as   indicated   in   Table   4-16. Observe  readings  as  in  dicated  in  Table  4-16  (See note  below  Table.) (20)  Disconnect  equipment  and  replace cover. b.  Phazor  Adjustments.   Perform   these   pro- cedures  only  when  directed  by  the troubleshooting   procedures   (Table   4-17). (1)  Connect  Balancer  and  test  equipment  as shown  in  Figure  4-8. (2)  Set  FUNCTION  switch  to  A,  R.P.M. RANGE   switch   to   X10,   and   INTERRUPTER LOGIC   switch   to   SINGLE.