16
1)
If the display is still showing the previously calculated unbalance values.
The motherboard is not receiving or detecting the START signal from the keyboard or
microswitch.
Check:
•
the operation of the automatic start microswitch on the wheel guard (lowering the guard
should close the switch's contact);
•
the cabling of the automatic start microswitch;
•
the operation of the START key.
If the above checks do not identify any defective components, replace the motherboard.
2)
If the display is showing the wheel geometric data.
The motherboard is receiving the signal from the START button or microswitch, but the
command is not executed.
Check:
- that the Control cable which connects the motherboard to the power and control board is
correctly fitted and wired;
- that the power and control board is operational, and in particular that fuse FU4 and the spin
motor relay are in good condition.
Proceed as follows:
•
disconnect the motor power supply cables;
•
apply the terminals of a tester in DC voltmeter mode to the terminals of the disconnected
cables;
•
press the START button. If the control upline of the measurement point (including
relay) operates correctly, the tester should read approximately 28 Volt.
- the condition of the spin motor.
If the above checks do not identify any defective components, replace the motherboard.
When the machine is switched on, the display reads "ttt"
-
Switch off the machine;
-
Set microswitch 2 of the "SW 2" pair next to the upper edge of the motherboard between
the LH display and the corresponding position indicator to ON. The microswitch is
accessible without having to disassemble the board from its panel;
-
switch on the machine.
When the machine is switched on, the displays are blank
Check that the switch for programming the CPU is in the correct position
-
Switch off the machine;
-
open the rear panel of the display head by undoing the four M4 bolts;
-
on the top right, turn microswitch 2 of the "SW 1" couple (the first from the right) to
OFF. The microswitch is accessible without having to disassemble the board from its
panel;
When it is switched on, the machine is locked (not accepting commands)
Check:
-
that all the keyboard keys are undamaged, i.e. that none of them is remaining constantly
depressed due to a breakage. In this case, replace the faulty key or the entire motherboard;
-
that no keys are permanently depressed due to incorrect installation of the motherboard to
its panel;
Whenever mounting a circuit board to its panel, make sure that the keys, which are mounted
directly on the motherboard, operate correctly. Proceed as follows:
