ARMY TM 9-6115-464-34AIR FORCE 35C2-3-445-2NAVY NAVFAC P-8-624-34(e) Turn R12 to full counterclockwise position. Reading of M2 and M3 shall be 600-1000 milliamperesand be balanced within 50 milliamperes.(f) Adjust R11 and R12 as in step (c) above and Iock for remainder of test.(4) Perform frequency sensing test as follows:(a) Install the governor control unit in test circuit as shown in figure 3-78.(b) Apply 57.5 to 62.5 Hz, 120 ±2 volts ac to P1-A and P1-B (375 to 425 Hz for 400 Hz units).(c) Adjust Rb so the resistance between P1-M and P.-T is 250 ohms.(d) Reduce the frequency of the applied 120 ±2 volt supply until M2 and M3 balance. The frequencyshall be 57-58 Hz (375 to 425 Hz on 400 Hz sets).(e) Adjust Rb so the resistance between P1-M and P1-N is 250 ohms.(f) Increase the frequency of the applied 120 ±2 volt supply until M2 and M3 balance. The frequencyshall be 64-65 Hz (420-425 Hz on 400 Hz units).(5) Perform rectifier bridge and feedback winding test as follows.(a) Install governor control unit in test circuit as shown in figure 3-79.(b) Turn R14 and R15 to full counterclockwise position.(c) M5 shall indicate -5 to -7 milliamperes.(d) Adjust R14 clockwise until indication of M2 and M3 are balanced.(e) Place SW1 in the LOW position. M3 shall indicate 600 to 840 milliamperes. M3 shall indicate 0 to300 milliamperes. M5 shall indicate less than 0 to + 1.5 milliamperes.(f) Place SW1 in the HIGH position. M2 shall indicate 0 to 300 milliamperes. M3 shall indicate 600 to840 milliamperes. M5 shall indicate less than 0 to –1.5 milliamperes.(6) Perform parallel winding test as follows:(a) Install governor control unit in test circuit as shown in figure.(b) M2 shall indicate 0 to 300 milliamperes. M3 shall indicate 600 to 840 milliamperes.(c) Reverse polarity of connections to pins J1-E and J1-G.(d) M2 shall indicate 600 to 840 milliamperes. M3 shall indicate 0 to 300 milliamperes.h. Potting.(1) Check all connections and if any have been bored for test purposes, or if any defected componentshave been replaced, the effected area and components must be coated with polyurethane resin toprevent oxidation or other corrosion. The coating must be of a minimum thickness of 0.007 inch andair bubble entry into the applied polyurethane must be controlled so that the legibility of componentcoding and identification is not impaired.(2) Check connections of printed circuit board to cover.3-164
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