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On the keyboard there are 2 diodes:
t One of them is green, labeled POWER ON: when it is turned on it indicates that the machine is
electrically supplied
t The other diode, the red one labeled CPU ERROR: when it is turned on it indicates an error of
CPU control board. In case it should turn on, try to press on RESET and, if the situation does
not improve, contact AMP or your local distributor for assistance.
5.3 KEYBOARD CODE/COLORS OF ELECTRONIC CONTROL DEVICE
BLUE keys f unctions/alphabetical keys
GREENkeys alpha/numerical keys
RED keys RESET (re-initialization) keys ; STOP (motor stop)
ORANGEkeys EDITING ke ys (fu t u re a p p lica t io n s)