9.2.6.9
E640: Secondary collimator zero position optical sensor always
active /
E641 and E642: Secondary collimator zero position optical
sensor still active after exiting from zero sensor /
E643: Secondary collimator zero position optical sensor never
active /
E644: Timeout on Secondary collimator movement
E645: Secondary collimator motor overrun
These errors are signals of a problem on the secondary collimator movement.
The position of the secondary collimator movement is controlled by the optical
sensor B5, that is activated during the sensor holder axis reset; if this sensor is
found active at the start up phase, and it is never sensed de-activated, the errors
E640 - E642 are displayed, meaning that the sensor itself is broken or that the
motor is not running.
In case that it is never sensed activated, the errors E643 and E644 are displayed.
In all cases, the optical sensor functionality can be checked placing an opaque thin
material in the optical path and using a multimeter, verify that the voltage
between pin X95-4 and pin X95-6 on the Ceph driver board A13 is about 5V when
the optical path is covered by the thin material and about 0V when the optical
path is not covered.
Check the continuity of the cables up to the CCU with a multimeter. The path is as
follows:
B5->X95->A13->X89-pin3 / X58-pin3->CCU
Any interruption of this chain can therefore also lead to the A13 board
If there is no variation and the secondary collimator does not move or moves with
difficulty or jumps:
a.
check the belt and verify that it is not broken; if the belt is loose, adjust
its tension
b.
check the 24V on the A13 board (led H2) if not present check the cables
X53-X87, X54-X88 and the fuse F1.
c.
check cable X93 of motor M10; 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 A13 board.
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