26
ENGLISH
Use and maintenance manual
Diagnostics
8. Diagnostics
8.1 INCONSISTENT UNBALANCE READINGS
In some cases, when a wheel that has just been balanced is repositioned on the balancer, the machine can detect
an unbalance.
This is not a machine problem but is due to faulty mounting of the wheel on the flange. In other words, when
mounting the wheel after initial balancing, it has taken another position with respect to the balancer shaft axis.
If the wheel has been mounted on the flange with screws, the screws may not have been tightened correctly (criss-
cross sequence) or the tolerances of the holes drilled in the wheel may be too large. Small errors, up to 10 grams
(0.4 oz), are to be considered normal in wheels locked with the relative cone: The error is normally greater for
wheels locked with screws or studs.
If, after balancing, the wheel is still unbalanced when refitted on the vehicle, this could be due to an unbalanced
brake drum or, very often, the tolerances of the holes drilled in the rim and drum are too large. In this case, bal-
ancing should be performed using a balancer with the wheel mounted on the vehicle.
8.2 ALARM SIGNAL
The machine has a self-diagnostics cycle which identifies the most frequent malfunctions during the normal work
cycle. These malfunctions are processed by the system and shown on the display.
The information in the POSSIBLE REMEDY column requires work to be performed by specialist technicians or other authorised people
who must always work using the Personal Protective Equipment indicated in the INSTALLATION manual. In some cases, this work can
be performed by a normal operator.
ERROR PROBLEM POSSIBLE SOLUTIONS
Black The wheel balancer does not switch on ▪ Verify correct connection to the mains
▪ Verify and eventually replace the fuses on the power card
▪ Verify monitor function
▪ Replace the computer board
Err. 1 No rotation signal ▪ Check in self-diagnostics that the encoder functions properly
▪ Replace the phase pick-up board
▪ Replace the computer board
Err. 2 Speed too low during detection
During the unbalance measurement revo-
lutions, the wheel speed has fallen to
below 42 rpm
▪ Make sure that a vehicle wheel is mounted on the wheel balancer
▪ Use the self-diagnostics function to check the encoder
▪ Disconnect the piezo connectors from the board and do a spin
(if no error is detected, replace the piezo sensors)
▪ Replace the CPU board
Err. 3 Unbalance too high ▪ Verify wheel dimension settings
▪ Check detection unit connections
▪ Perform machine calibration
▪ Mount a wheel with more or less known unbalance (less than 100
grammes) and verify the response of the machine
▪ Replace the computer board
Err. 4 Rotation in opposite direction
After pressing [START], the wheel
starts turning in the opposite direction
(anticlockwise)
▪ Check in self-diagnostics that the encoder functions properly
▪ Check the bearing/spring of the phase generator
Err. 5 Guard open ▪ Reset the error
▪ Close the guard
▪ Verify the function of the protection Switch
Err. 7/
Err. 8/
Err. 9
NOVRAM parameter read error ▪ Switch off the machine and wait for at least ~ 1 min.; re-start the
machine and check it works properly
▪ Repeat machine calibration
▪ Replace the computer board
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