Print head control circuit and liquid discharge apparatus

A liquid discharge apparatus comprising:

• a print head having a function of performing self-diagnosis in accordance with signals input from a first coupling point, a second coupling point, a third coupling point, a fourth coupling point, and a fifth coupling point;
• and
• a print head control circuit controlling an operation of the print head, wherein
• the print head control circuit includes
• a first cable having a first drive signal wiring group, a second drive signal wiring group, and a first diagnostic signal wiring group,
• a second cable having a third drive signal wiring group, a fourth drive signal wiring group, and a second diagnostic signal wiring group,
• a diagnostic signal output circuit outputting a first diagnostic signal, a second diagnostic signal, a third diagnostic signal, and a fourth diagnostic signal, and
• a drive signal output circuit outputting a first drive signal and a second drive signal that cause the print head to discharge liquid,
• the first diagnostic signal wiring group includes first diagnostic signal propagation wiring that propagates the first diagnostic signal input to the first coupling point, second diagnostic signal propagation wiring that propagates the second diagnostic signal input to the second coupling point, and third diagnostic signal propagation wiring that propagates the third diagnostic signal input to the third coupling point,
• the second diagnostic signal wiring group includes a fourth diagnostic signal propagation wiring that propagates the fourth diagnostic signal input to the fourth coupling point, and a fifth diagnostic signal propagation wiring that propagates a fifth diagnostic signal input to the fifth coupling point,
• the first drive signal wiring group propagates at least one of the first drive signal and the second drive signal,
• the second drive signal wiring group propagates at least one of the first drive signal and the second drive signal,
• the third drive signal wiring group propagates at least one of the first drive signal and the second drive signal,
• the fourth drive signal wiring group propagates at least one of the first drive signal and the second drive signal,
• in a first contact group in which the first cable and the print head are in electrical contact with each other, a first contact portion in which the first coupling point and the first diagnostic signal propagation wiring are in electrical contact with each other, a second contact portion in which the second coupling point and the second diagnostic signal propagation wiring are in electrical contact with each other, and a third contact portion in which the third coupling point and the third diagnostic signal propagation wiring are in electrical contact with each other are located between a first drive signal contact group in which the first drive signal wiring group is in electrical contact with the print head, and a second drive signal contact group in which the second drive signal wiring group is in electrical contact with the print head, and
• in a second contact group in which the second cable and the print head are in electrical contact with each other, a fourth contact portion in which the fourth coupling point and the fourth diagnostic signal propagation wiring are in electrical contact with each other, and a fifth contact portion in which the fifth coupling point and the fifth diagnostic signal propagation wiring are in electrical contact with each other are located between a third drive signal contact group in which the third drive signal wiring group is in electrical contact with the print head, and a fourth drive signal contact group in which the fourth drive signal wiring group is in electrical contact with the print head.