Calibrate Control Module Assembly and Sensing Module Assembly

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ASSEMBLY-CONT.

TM-55-1905-223-24-18-2 Landing Craft Utility (LCU) NSN 1905-01-154-1191 Basic Craft Part II Manual

FIGURE 4-9. Control Module Assembly.

TM 55-1905-223-24-18-2

4-19. Calibrate Control Module Assembly and Sensing Module Assembly. (Figure 4-9)

This task covers:

Calibration.

INITIAL SETUP :

Tools

Equipment Condition

Tool kit, general mechanic's,

Control module assemblies and sensing

module operational as specified in

Tool kit, electrician's,

paragraph 2-28 .

CALIBRATION

NOTE

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.

WARNING

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.