TM 5-6115-275-14 NAVFAC P-8-615-14 TO 35C2-3-452-1 (6) Test diode CR7. (a) Locate diode CR7 on circuit board. (b) Test  diode  CR7  with  a  multimeter  (set  to read  ohms).    Measure  resistance  across CR7,   reverse   test   leads,   and   measure resistance again. (c) Resistance  should  be  low  (1  to  50  ohms) one  way  and  infinite  (oo)  resistance  the other way. (d) If  low  or  high  resistance  is  measured  in both   directions,   diode   CR7   should   be replaced. (7) Test transistor Q 1. (a) Make    sure    that    transistor    Q2    is    still removed and  that  one  lead  of  diode  CR6 is unattached to the printed circuit board. (b) Locate  power  transistor  Q    on  the  printed circuit board. (c) Test  transistor  with  a  multimeter  (set  to read  ohms).    Refer   to   Figure   714   and Table 7-2.  Multimeter ( + ) and (-) refer to the multimeter test leads. Table 7-2.  Q1 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 (d) Resistance    measurements    other    than those listed in Table 7-2 indicate an open or shorted junction within Q 1, Q I should be replaced. (8) Solder lead of diode CR6 to printed circuit board. (9) Install transistor Q2 (1, Figure 7-13) with mica insulator between Q2 and regulator housing. (10) If    necessary,    apply    a    small    amount    of    heat    sink compound     (P/N     13217E3704,     FSCM 97403)   to   transistor   Q2   and   housing. Secure  transistor  Q2  with  screws  (2)  and washers (3). (11) Make test connections. (a) Connect  a  30  ohm  120  watt  resistor  to terminals #21 and #20 of terminal strip TB 1 (5). (b) Obtain a 750 ohm 2 watt rheostat. (c) Position  rheostat  so  that  control  shaft  is facing you and the three terminal lugs are facing    up.        Connect    a    12-18    AWG insulated  wire  to  the  middle  terminal  lug and another wire to the left hand terminal lug of the rheostat. (d) Attach the two rheostat leads to terminals #26   and   #28   of   terminal   strip   TBI   (5). Turn     the     rheostat     clockwise     to     its maximum rotation. (e) Connect   a   0-150   VAC,   60   HZ   power supply    to    terminals    #24    and    #27    of terminal strip TB 1 (5). (12) Perform tests. (a) Turn on the power supply and set for 115 VAC. (b) Set   a   multimeter   to   read   a   0-50   VDC range. (c) Check  for  30-35  VDC  between  terminals #20  and  #21  of  terminal  strip  TB  1  (5). Terminal #20 is positive and terminal #21 is negative. (d) Rotate   the   shaft   of   the   test   rheostat counterclockwise  to  approximately  eighty percent   of   its   maximum   rotation.      The voltage between terminals #20 and #21 of TB 1 (5) should now be zero. (e) Rotate   the   shaft   of   the   test   rheostat clockwise  while  observing  the  voltage  at terminals #20 and #21 of TB1 (5). (f) Voltage  at  terminals  #20  and  #21  should  be  between 30   and   35   volts   when   test   rheostat   is turned  to  approximately  eighty  percent  of its  clockwise  rotation.      If  no  voltage  is present, refer to step (1). (g) If there is a delay of two seconds or more between  decreases  and  increases  of  the voltage  at  terminals  #20  and   #21   or   if voltage changes do not occur at the eighty percent    of    maximum    rotation    points, adjust  R6.    Refer  to  (h)  for  adjustment procedure.    If  no  delay  is  present  and voltage    changes    occur    at    the    eighty percent  rotation  points,  testing  procedure is   completed.      If   no   voltage   change occurs,  regardless  of  the  position  of  the test rheostat, refer to step (i). 7-14.2  Change 8