(57) A print head control circuit controls an operation of a print head including a diagnosis
circuit that diagnoses whether or not normal discharge of a liquid is possible. The
print head control circuit includes a first cable including a first diagnosis signal
propagation wiring for propagating a first diagnosis signal, a second diagnosis signal
propagation wiring for propagating a second diagnosis signal, a third diagnosis signal
propagation wiring for propagating a third diagnosis signal, a fourth diagnosis signal
propagation wiring for propagating a fourth diagnosis signal, and a first driving
signal propagation wiring for propagating a driving signal. A shortest distance between
the first driving signal propagation wiring and the diagnosis circuit is longer than
a shortest distance between the first diagnosis signal propagation wiring and the
diagnosis circuit, longer than a shortest distance between the second diagnosis signal
propagation wiring and the diagnosis circuit, longer than a shortest distance between
the third diagnosis signal propagation wiring and the diagnosis circuit, and longer
than a shortest distance between the fourth diagnosis signal propagation wiring and
the diagnosis circuit.
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