fix(api): Position plunger to bottom before picking up a tip (#13049)

Opentrons · Jul 6, 2023 · 4becec5 · 4becec5
1 parent 0c787ba
commit 4becec5
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Showing 3 changed files with 3 additions and 1 deletion.
diff --git a/api/src/opentrons/hardware_control/ot3api.py b/api/src/opentrons/hardware_control/ot3api.py
@@ -1668,6 +1668,7 @@ async def pick_up_tip(
             realmount, tip_length, presses, increment
         )
 
+        await self._move_to_plunger_bottom(realmount, rate=1.0)
         if spec.pick_up_motor_actions:
             await self._motor_pick_up_tip(realmount, spec.pick_up_motor_actions)
         else:

diff --git a/api/tests/opentrons/hardware_control/test_ot3_api.py b/api/tests/opentrons/hardware_control/test_ot3_api.py
@@ -1339,6 +1339,7 @@ async def test_pick_up_tip_full_tiprack(
     ot3_hardware: ThreadManager[OT3API],
     mock_instrument_handlers: Tuple[Mock],
     mock_ungrip: AsyncMock,
+    mock_move_to_plunger_bottom: AsyncMock,
 ) -> None:
     mock_ungrip.return_value = None
     await ot3_hardware.home()

diff --git a/hardware-testing/hardware_testing/production_qc/pipette_assembly_qc_ot3.py b/hardware-testing/hardware_testing/production_qc/pipette_assembly_qc_ot3.py
@@ -795,7 +795,7 @@ async def _read_pressure() -> float:
     if not api.is_simulator:
         _get_operator_answer_to_question('REMOVE tip to nozzle, enter "y" when ready')
     print("moving plunger back down to BOTTOM position")
-    await helpers_ot3.move_plunger_absolute_ot3(api, mount, bottom)
+    await api.dispense(mount)
     await api.remove_tip(mount)
     return pressure_open_air_pass and pressure_sealed_pass and pressure_compress_pass