TM 5-6115-465-34
T0 35C2-3-446-2
NAVFAC P-8-625-34
TM 06858B/06859D-34
(c) Using an ohmmeter, check resistance
(8) Repair housing and cover as follows:
of points in table 4-2 for specified values.
(a) Straighten dents and warping.
NOTE
(b) Remove defective paint and cor-
Observe polarity of connections specified
rosion. Treat and paint.
in the table. Return potentiometer to
clockwise position after each check.
(9) Repair wiring harness as follows: If
the wiring harness has sustained damage and re-
(3) Perform magnetic amplifier bias test as
quires repair or rebuild, refer to figures 4-16
follows:
(50/60Hz as required for layout identification
and material requirements and Appendix A for
(a) Install governor control unit in
detailed soldering and replacement procedures.
test circuit illustrated in figure 4-24.
(10) Test and replace printed circuit board
NOTE
components using figures 4-18, 4-19, 4-20, 4-21,
and 4-22 as appropriate.
Frequency of power source (Gl) must con-
form to frequency of governor control
(11) If any soldered component on the printed
unit being tested.
circuit board must be replaced, refer to Appendix
A for detailed soldering and replacement procedures.
(b) Turn potentiometers Rll, R12, R14,
R15, R16, and R18 to full clockwise position.
f. Assembly.
(c) Adjust Rll and R12 to obtain a bal-
(1) Assemble governor control unit in re-
anced reading of 450 milliamperes on M2 and M3.
verse order of removal procedures using figure
4-15 as a guide.
(d) Turn R12 to full clockwise. Reading
of M2 and M3 shall be 0 to 300 milliamperes and
NOTE
shall be balanced within 50 milliamperes.
Prior to installing assembled governor
(e) Turn R12 to full counterclockwise
control unit in housing and pouring pot-
position. Reading of M2 and M3 shall be 600-1000
ting compound, perform tests (subparagraph
milliamperes and be balanced within 50 milliamperes.
g.) below.
(f) Adjust Rll and R12 as in step(c)
(2) After completing assembly, repeat tests
above and lock for remainder of test.
g.(2), (3), (4) (checks only), (5) and (6).
(4) Perform frequency sensing test as
(3) After final assembly, use an ohmmeter
follows:
to check for open circuit between each pin on all
connectors and each test point and the governor
(a) Install the governor control unit
control unit housing. There shall be no sign of
in test circuit as shown in figure 4-25.
(b) Apply 5705 to 62.5 Hz, 120 2 volts
g. Testing.
ac to P1-A and P1-B.
CAUTION
(c) Adjust Rb so the resistance between
P1-M and P.-T is 250 ohms.
Unpotted governor control unit printed
circuit board must be positioned as speci-
(d) Reduce the frequency of the applied
fied in step (1) below.
120 2 volt supply until M2 and M3 balance. The
frequency shall be 57-58Hz (375 to 425 Hz on 400
Hz sets).
(1) Position governor control unit printed
circuit board as shown in figure 4-23.
(e) Adjust Rb so the resistance between
P1-M and P1-N is 250 ohms.
(2) Perform resistance test as follows:
(f) Increase the frequency of the ap-
(a) Turn potentiometers (Rll, R12, R14,
plied 120 2 volt supply until M2 and M3 balance.
R15, R16 and R18. figure 4-15) to the full clock-
The frequency shall be 64-65 Hz.
wise position.
{5) Perform rectifier bridge and feedback
(b) Preset adjustable resistors (R2
winding tests as follows.
and R1O, figure 4-18) to mid-range.
4-25
Change 5
