Drive unit, liquid ejecting head unit, and liquid ejecting apparatus

A liquid ejecting head unit, comprising:

• a drive unit configured to generate a drive signal for driving the liquid ejecting head unit;
• and
• a head,
• the head including
• an ejecting orifice that, upon receiving a drive signal supplied from the drive unit, ejects liquid from a nozzle provided in a nozzle surface, and
• a collective board that includes a head connector,
• the drive unit including
• a drive board on which a drive circuit configured to generate the drive signal is mounted;
• a thermal conductive material that is in contact with the drive circuit on an opposite side in relation to the drive board;
• a water cooling mechanism that is in contact with the thermal conductive material on an opposite side in relation to the drive circuit;
• a pump that causes liquid in the water cooling mechanism to flow;
• and
• a control circuit that controls operation of the pump, wherein
• the control circuit switches a direction in which the pump causes the liquid to flow between a forward direction and a reverse direction that is an opposite of the forward direction.

A liquid ejecting apparatus, comprising:

• a plurality of sets each including a plurality of liquid ejecting head units and a transportation unit, the liquid ejecting head unit including a drive unit and a head, the drive unit being configured to generate a drive signal for driving the liquid ejecting head unit,
• the head including
• an ejecting orifice that, upon receiving a drive signal supplied from the drive unit, ejects liquid from a nozzle provided in a nozzle surface, and
• a collective board that includes a head connector,
• the drive unit including
• a drive board on which a drive circuit configured to generate the drive signal is mounted;
• a thermal conductive material that is in contact with the drive circuit on an opposite side in relation to the drive board;
• a water cooling mechanism that is in contact with the thermal conductive material on an opposite side in relation to the drive circuit;
• a pump that causes liquid in the water cooling mechanism to flow;
• and
• a control circuit that controls operation of the pump, wherein
• the control circuit switches a direction in which the pump causes the liquid to flow between a forward direction and a reverse direction that is an opposite of the forward direction.