Mondolfo Ferro MT 2450, Technical & Service Manual

Technical service manual 

21

UK

“THE MACHINE DOES NOT PERFORM THE WHEEL SPIN WHEN the 

START BUTTON IS PRESSED and/OR THE GUARD IS LOWERED”

In this case the various causes can be identified on the basis of the information on the 
displays.

1) The displays continue to display the imbalance values calculated previously.

The motherboard is not receiving or not “hearing” the START signal from the keyboard 
or microswitch.
Check:
- that the automatic start microswitch associated to the wheel guard is operating cor-

rectly (when the guard is lowered the switch contact must be closed); 

- that the cam which trips the automatic start device microswitch is set correctly;
- that the automatic start microswitch is wired correctly;
- that the START key is operating correctly.
If the checks listed above do not reveal faulty components, replace the motherboard.

2) The displays show the wheel’s geometrical data.

The motherboard is receiving the signal from the START button or microswitch, but the 
resulting command is not being given.
Check:
- that the “control cable” connecting the motherboard to the “power supply and con-

trol” circuit board is connected and wired correctly;

- that the “power supply and control” circuit board is operating correctly;
- that the wheel spin motor is in good working order.

If the checks listed above do not reveal faulty components, replace the motherboard.

3) The displays show the message “Cr Err”.

The contact of the microswitch associated to the guard is open.
Check:
- that the guard is lowered when a wheel spin is performed (by pressing the START 

button);

- that the automatic start microswitch associated to the wheel guard is operating cor-

rectly (when the guard is lowered the switch contact must be closed); 

If the checks listed above do not reveal faulty components, replace the motherboard.

4) The displays show the message “Err 30

If abnormal noise is noted, check the condition of the roller or the setting of the wheel 
spin device. 
If the wheel is rotated, check operation of the encoder circuit board, see “Service Pro-
grams”.
If on the other hand the motor does not start:
- check the motor fuse on the Peac FU1 circuit board;
- check that the motor power supply cable is connected correctly;
- check operation of the PEAC circuit board;
- check operation of the motor.