f. Turn the power ON and manually rotate the servo shaft to the 0-degree position 
as indicated on the digital indicator. 
g. Adjust the multiturn control potentiometer for minimum signal on the oscilloscope. 
h. Adjust C-1 (Figure 41) for minimum quadrature signal. Readjust the control 
potentiometer slightly if necessary. 
i. Move the oscilloscope input cable to the 0.47 uf condenser connected to the 
cathode of V3. 
j. Adjust C2 (Figure 41) for minimum quadrature signal. 
k. Connect an a-c voltmeter to junction Y, shown in Figure 42, which is between 
sections of R5. Set the VELOCITY dial to 50. 
1. Observing the null indication on the oscilloscope and the digital position indi- 
cator on the servo unit, adjust R-1 (GAIN) and R-2 (CENTERING) so that the polarized relay 
contacts close (indicated by voltmeter reading) when the shaft is rotated 1 degree either side 
of the center (null) position. 
m. Turn the power OFF, install the jumper, and then turn the power ON again. 
n. Momentarily ground terminal 3 of TA-40001. If the servo motor tends to run in 
either direction, adjust resistor R7 (Figure 41) so that the motor does not run while terminal 3 
is grounded. 
o. Turn the CONTROL SELECTOR switch to the STD position and place a 100 
pound-inch dead-weight torque load on the servo. Check the run-in rate for raising a load in 
clockwise and counter-clockwise directions. If the run-in rates are different, adjust R-4 
(Figure 41) for fastest and approximately equal run-in rates. 
p. Remove load and check damping for STD and VEL positions of SELECTOR 
switch. If necessary adjust R-3 or R-6 for desired degree of damping. 
q. The gear train in the servo unit should be periodically lubricated with a small 
amount of Lubriplate. 
3.2 PROPULSION CHANNELS 
3.2.1 Propulsion Control Panel 
There are no electrical adjustments on the propulsion control panel. Forward and 
reverse sections of the potentiometers are padded for equal total resistance when installed. 
Mechanical adjustments are provided for alignment of the potentiometers to the control levers. 
Adjustments are also provided for the microswitches which control the propulsion reversing 
circuits. A small amount of powdered Molly-Coat should be applied to the control shafts for 
smooth operation. The + 150 volt leads to the potentiometers are fused to protect the 
resistance elements of the potentiometers. 
