(57) An electronic organ having an internal system for fault detection is disclosed. Information
regarding the actuated keys, tab switches, and control switches of the organ is read
into a microprocessor (50) which controls tone generators, filters (230, 240) and
the like in response thereto. Upon actuation of a unique set of input switches (130),
the microprocessor branches into a diagnostic routine. In the diagnostic routine,
all of the input and output circuits are sequentially tested so that any faults can
be isolated. A lighted display associated with one set of the switches provides visual
output as to the progress of the test sequence. In addition, when a fault is detected,
this lighted display provides information regarding the location of the fault. Through
use of this system, a test of an electronic organ can be performed rapidly, and the
test protocol can ensure that no switches or output circuits are accidentally omitted.
In addition, because selection among comparable circuits is accomplished internally
by the microprocessor, technician control is permitted over aspects of the organ operation
which are normally inaccessible to a musician performing on the organ. The diagnostic
sequence automatically resets when the organ is turned off so that even if a performer
accidentally entered the diagnostic mode, the organ would readily return to normal
operation. The test sequence can be caused to proceed on an automatic or a semi-automatic
basis at the option of the test technician.
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