TM 5-6115-275-14 NAVFAC P-8-615-14 TO 35C2-3-452-1 (b) Remove  screws  (2)  and  washers  (3) securing Q2 to housing. (c) Pull transistor (1) straight from housing, being careful not to damage the mica insulator under the transistor. CAUTION move  the  white  heat  sink  paste  from  the  mica  insulator, transistor,    or    regulator    housing.        If    this compound   is   removed   transistor   Q2   will overheat and become damaged. (d) Test  transistor  with  a  multimeter  (set to  read  ohms).    Refer  to  Figure  714 and Table 7-1.  Multimeter ( + ) and (- ) refer to the multimeter test leads. Figure 7-12.2.   Q1 and Q2 Transistor Pin Out Locations. Table 7-1.  Q2 Test Chart. Multimeter ( + ) Multimeter (-) Meter Reading Collector Emitter Infinite oo Collector Base Infinite oo Emitter Collector Infinite oo Base Collector 1 to 50 ohms Base Emitter 1 to 50 ohms Emitter Base Infinite oo (e) Readings  other  than  those  listed  in Table  7-1  indicate  either  an  open  or shorted   junction   within   Q2   and   Q2 should be replaced. NOTE Do not install transistor Q2 at this time.  With Q2 removed, transistor QI   can   be   tested   without   removal   of   the transistor from the printed circuit board. (3) Remove terminal strip TB 1. (a) Remove  two  screws  (4,  Figure  7-13) that secure terminal strip TB 1 (5). (b) Gently    pull    terminal    strip    TB1    (5) along  with  the  printed  circuit  board upward. (4) Test diode CR5. (a) Locate  diode  CR5  located  on  circuit board. (b) Test diode CR5 with a multimeter (set to  read  ohms).    Measure  resistance across  CR5,  reverse  test  leads,  and measure resistance again. (c) Resistance   should   be   low   (1   to   50 ohms)     one     way     and     infinite     0 resistance the other way. (d) If low or high resistance is measured in  both  directions  diode  CR5  should be replaced. (5) Test current regulating diode CR6. (a) Locate  diode  CR6  located  on  circuit board. (b) Unsolder   and   lift   one   end   of   diode CR6 from the printed circuit board. (c) Test diode CR6 with a multimeter (set to  read  ohms).    Measure  resistance across  CR6,  reverse  test  leads,  and measure resistance again. (d) Resistance   should   be   low   (1   to   50 ohms) one way and greater than 500 ohms resistance the other way. (e) If low or high resistance is measured in  both  directions  diode  CR6  should be replaced. NOTE Do not install diode CR6 lead to printed circuit board until transistor Q 1 has been tested. Change 8  7-14.1