E200: Zero position optical sensor of rotation always active /
E201: Zero position optical sensor of rotation never active /
E204: Unexpected activation of zero position rotation sensor
These messages mean that, during the rotation, there is no change or an
unexpected activation of the optical sensor B3.
The position of rotation is controlled by the optical sensor B3, that is
activated at the start of the rotation travel; if this sensor is found active
at the start up phase, and it is never sensed de-activated, the E200
message error is displayed, meaning that the sensor itself is broken or
that the motor is not running.
In case that it is never sensed activated, the E201 is displayed, and the
reasons are the same.
E204 means that, during some movements, the sensor changes its status
to activated in an abnormal condition.
Entering the rotation motor service program it is possible to check the
cause of the error.
character "a".
In all cases, the sensor’s functionality can be checked by placing an
opaque thin material in the optical path and looking at the voltage
coming out from the sensor.
Using the left and right arrows it is possible to rotate the arm, checking if
the status of sensor changes accordingly.
1. If there is no variation of the above signals, if the arm does not move
or moves with difficulty or jumps:
• check the belt and verify that it is not broken; if the belt is loose,
adjust its tension
• check cable of stepper motor; there can be a short circuit or a
broken wire; check also for a loosen contact. In case of short
circuit, replace the cable, verifying also that no damage has been
caused to the motor driver on the CPU.
2. If the arm moves, verify the cable up to the CPU board (A5). If it still
continues to have no variation of the signals when there is an
activation of the switches, change the CPU board.
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