TM 9-2350-256-20-2
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3.
Remove cap assembly (32) from end of switching relay box (3), loosen rheostat locknut (45) with screwdriver, and turn
rheostat (38) fully counterclockwise.
4.
Connect only the 61A leads (2) of resistor beneath switching relay box (3), leaving 61A (46) open.
5.
Start main engine, operate at approximately 1000 rpm and charge batteries for 30 minutes, then turn off engine.
6.
Leave main engine fuel turned off, and crank starter for three cycles of 15 seconds on and 3 minutes off.
7.
Start APU and warm up unloaded for one minute
8.
Turn on generator switch and quickly (within 15 seconds) adjust rheostat for 0.50 volts on meter before movement of
rheostat no longer produces a voltage change, or voltage begins to decrease. Then turn off APU generator and engine.
NOTE
If adjustment of rheostat cannot be made to obtain 0.50 volts, turn off generator and engine, return
rheostat counterclockwise, replace 61A lead on resistor with 61AC lead, then continue with step 9.
9.
Repeat steps 6,7, and 8 to make final adjustment of rheostat so as to obtain 0.50 volts on multimeter.
10. Tighten rheostat locknut (45), replace cap assembly (32) on switching relay box (3). Disconnect leads (2). Remove
multimeter. System is calibrated.
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