Technical service manual
15
UK
adjust the position of the microswitch on its mounting.
- Perform the checks described above with a tester. If these checks do not rectify the
problem, replace the microswitch, ensuring that the two contacts are reconnected
correctly as shown in figure 2d. To replace the microswitch, loosen the two screws (A,
figure 2d).
- Check the cable connecting the microswitch to the board.
Fig.2d
IMPORTANT
In the event of any work on the measurement sensor, the measurement sensor itself
must be calibrated as indicated in the use and maintenance manual.
- Check that the distance and diameter values read are correct, using wheels with
known dimensions or a special tool. To set the aforementioned values with a precision
of a tenth of an inch, on the display, select “OFF” for rounding to the nearest inch of
the diameter values read by the automatic sensor display as described in chapter “91
Thresholds and rounding”. The maximum error allowed for a wheel with a steel rim and
of medium dimensions is +/- 0.2 inches.
Notes
Please note that the nominal diameter of a wheel (e.g. 14”) refers to the tyre bead
contact surface, which is inside the wheel rim itself. The values measured are with
reference to external planes and, as a result, aresmaller than the nominal values
due to the thickness of the rim itself. The correction value therefore refers to an
average thickness of the rim. This means that the data measured on wheels with
different thicknesses may vary slightly (2 or 3 tenths of an inch maximum) from the
rated values. This is not a lack of accuracy of the measuring devices, but reflects
reality.
Summary of Contents for MT 2450
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