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TM 55-1905-223-24-18-2
4-19. Calibrate Control Module Assembly and Sensing Module Assembly. (Figure 4-9)
This task covers:
Equipment Condition
Tool kit, general mechanic's,
Control module assemblies and sensing
module operational as specified in
Tool kit, electrician's,
paragraph 2-28 .
Multimeter 6625-01-139-2512
The Oil Content Alarm (OCA) is calibrated to maintain the linear relationship
between the amplifying voltages and the parts per million (ppm) readouts of the
Digital Display. The OCA has been factory calibrated in ppm. However, the unit
should be recalibrated whenever any of the electronic components in the OCA
such as the Logic Board, the Amplifier Board, the Power Supply Board, the
Transformer Board, the incandescent lamp, the photo diodes, etc., are replaced.
The following procedures are used to check the calibration and to recalibrate the
OCA. A Simpson 260 test meter or equivalent should be used for voltage checks.
a. Turn power switch (1) on.
Excercise extreme care while working on electrical components inside control
module. Accidental contact with energized components may result in injury to
personnel or equipment damage.


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