6
Technical service manual
The program is used to:
check the release of the program installed on a machine to allow updates to be carried
out if necessary without having to remove the circuit board from the machine to read
the eprom label.
94 Standard imbalance values display
Selecting this program displays the imbalance values for the last wheel spin per-
formed, calculated with reference to the standard calibration coefficients (the ones
used by the machine when the circuit board has never been calibrated or if the cali-
bration coefficients calculated previously have been accidentally deleted).
To exit from the program (and the Service environment) press the “F” key.
The program is used to:
- optimise the clamping of the pick ups on the basis of the mechanical characteristics
of the central unit and those of the specific electronic circuit board.
95 Display of first gain synchronisation calibration coefficient.
Selecting the program displays:
- the string “F” on the left-hand display
- the synchronisation calibration coefficient on the right-hand display.
The value is expressed in notches (whole part) and eighths of a notch (decimal part) of
an encoder (one notch corresponds to about 1.4 degrees).
To exit from the program (and the Service environment) press the “F” key.
The program is used to:
- check that the values of the synchronisation calibration coefficient displayed are
within the permitted range, which is from -2.0 to +2.0.
96 Display of pick up signals and relative synchronisation
Selecting this program displays:
- the message “96” on the left-hand display;
- the message “GO” flashing on the right-hand display;
Before selecting the program the operator must:
- set CAR environment;
- fit an average-size 4WD wheel (generally 6” x 15”) on the wheel balancer;
- balance it precisely after setting “1 on” mode using service program 91;
- apply a weight of 100 gr (3.5 oz) to the outside of the rim;
- perform a wheel spin.
The machine acquires the imbalance signals and then displays in this order:
- the difference F between the signals of the pick ups and the ideal value of 180° (on
the right-hand display). The value is expressed in notches (whole part) and eighths of
a notch (decimal part) of an encoder (one notch corresponds to about 1.4 degrees).
- values proportional to the level of the signals received from the Inside and Outside
pick ups.
Notes
- The values displayed do not depend on the dimensions set.
- With the wheel at a standstill, the data read can be displayed in alternation by press-
ing the “Enter” key.
Summary of Contents for MT 2450
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