Liquid ejection head, replacement apparatus, and printing apparatus

A replacement apparatus for performing liquid filling or liquid filling recovery of a liquid ejection head,

• the liquid ejection head comprising:
• a liquid ejection substrate having ejection elements configured to eject a liquid;
• a circulation pump configured to supply the liquid to the liquid ejection substrate through a supply channel and to collect the liquid from the liquid ejection substrate through a collecting channel;
• a pump driving circuit configured to drive the circulation pump;
• a first connection terminal for connecting a ground of the pump driving circuit to outside;
• a second connection terminal for connecting a ground of the liquid ejection substrate to the outside;
• a first ground wiring connecting the ground of the pump driving circuit to the first connection terminal;
• and
• a second ground wiring connecting the ground of the liquid ejection substrate to the second connection terminal, wherein
• the second connection terminal and the second ground wiring are separated from the first connection terminal and the first ground wiring, wherein
• the replacement apparatus comprises
• a unit configured to cause the pump driving circuit to drive the circulation pump with the second connection terminal set in an open state and the first connection terminal grounded.

A printing apparatus for performing printing using a liquid ejection head and performing liquid filling or liquid filling recovery on the liquid ejection head,

• the liquid ejection head comprising:
• a liquid ejection substrate having ejection elements configured to eject a liquid;
• a circulation pump configured to supply the liquid to the liquid ejection substrate through a supply channel and to collect the liquid from the liquid ejection substrate through a collecting channel;
• a pump driving circuit configured to drive the circulation pump;
• a first connection terminal for connecting a ground of the pump driving circuit to outside;
• a second connection terminal for connecting a ground of the liquid ejection substrate to the outside;
• a first ground wiring connecting the ground of the pump driving circuit to the first connection terminal;
• and
• a second ground wiring connecting the ground of the liquid ejection substrate to the second connection terminal, wherein
• the second connection terminal and the second ground wiring are separated from the first connection terminal and the first ground wiring, wherein
• the printing apparatus comprises
• a unit configured to cause the pump driving circuit to drive the circulation pump with the second connection terminal set in an open state and the first connection terminal grounded.

A printing apparatus for performing printing using a liquid ejection head,

• the liquid ejection head comprising:
• a liquid ejection substrate having ejection elements configured to eject a liquid;
• a circulation pump configured to supply the liquid to the liquid ejection substrate through a supply channel and to collect the liquid from the liquid ejection substrate through a collecting channel;
• a pump driving circuit configured to drive the circulation pump;
• a first connection terminal for connecting a ground of the pump driving circuit to outside;
• a second connection terminal for connecting a ground of the liquid ejection substrate to the outside;
• a first ground wiring connecting the ground of the pump driving circuit to the first connection terminal;
• and
• a second ground wiring connecting the ground of the liquid ejection substrate to the second connection terminal, wherein
• the second connection terminal and the second ground wiring are separated from the first connection terminal and the first ground wiring, wherein
• the printing apparatus includes a unit configured to commonly ground the first connection terminal and the second connection terminal.

A printing apparatus for performing printing using a liquid ejection head,

• the liquid ejection head comprising:
• a liquid ejection substrate having ejection elements configured to eject a liquid;
• a circulation pump configured to supply the liquid to the liquid ejection substrate through a supply channel and to collect the liquid from the liquid ejection substrate through a collecting channel;
• a pump driving circuit configured to drive the circulation pump;
• a first connection terminal for connecting a ground of the pump driving circuit to outside;
• a second connection terminal for connecting a ground of the liquid ejection substrate to the outside;
• a first ground wiring connecting the ground of the pump driving circuit to the first connection terminal;
• and
• a second ground wiring connecting the ground of the liquid ejection substrate to the second connection terminal, wherein
• the second connection terminal and the second ground wiring are separated from the first connection terminal and the first ground wiring, wherein
• the printing apparatus includes
• a first grounding unit configured to ground the first connection terminal;
• a second grounding unit configured to ground the second connection terminal via a switch, wherein
• in a case where the switch is in a conducting state, the second connection terminal is grounded, and
• in a case where the switch is in an open state, the second connection terminal is in an open state.