17
-
tighten down the four circuit board mounting nuts located at the corners;
-
finger tighten the two nuts located next to the keys;
-
check that all keys work by pressing them one at a time;
-
gradually tighten the two nuts so that the keys stay in contact with the polyester film
without being overloaded.
The balancing machine supplies different unbalance values in successive
spin cycles (differences greater than 3 grams with unbalance of 30 grams)
Check in the following order:
-
that the machine is resting stably on the floor and its feet are in good condition;
-
that the weight-holder lid is correctly located, without rubbing against the central unit bell
during the spin cycle;
-
that the brake shoe and spin unit drive roller are not touching the pulley during signal
acquisition
-
that the wheel is properly mounted to the shaft, so that there is no slippage between the
wheel and the flange during the spin cycle.
-
To check this latter requirement, make two reference marks in chalk, one on the flange
and one on the wheel, aligned with each other. Run a number of spin cycles and check
that the two marks are still aligned.
-
check that the pickups are correctly tightened, with reference to the signal values
displayed with service program "96";
-
check the operation of the motherboard by replacing it with a new one.
If the above checks do not reveal any faults, replace the central unit and check for running
noise in the bearings.
The motor continues driving the wheel and the spin cycle does not
terminate
Run all the checks on the search circuit board listed in the previous paragraph. Also check the
operation of the power and control circuit board with special reference to the motor power
relay.
The automatic sensor diameter/distance values are different from the real
dimensions
Check with function 98 that the sensors are operational by checking (see inside digital sensor
paragraph):
If the sensors are not malfunctioning it may be sufficient to recalibrate the outside sensor.
For small differences (at most one inch) above all with thicker than normal alloy rims, the
remarks of the abovementioned paragraph may apply.
Impossible to balance the wheel: when the weights specified by the
balancing machine are applied and a new spin cycle is run, new random
unbalance values are measured
Run all the checks listed in the previous paragraph.
Also check:
-
the geometrical dimension settings;
-
whether the machine is out of calibration, by running the sensitivity calibration
procedure;
