ABI Prism® 7900HT Sequence Detection System ... - OpenWetWare

Re-checking the
Input Stack 1
7-36 System Maintenance
To adjust the plate handler relative to the 7900HT instrument: (continued)
Step Action
7 Using the Vertical Positioning commands, carefully lower the plate handler arm onto
the instrument tray and confirm that the plate rests squarely within it.
8 Tighten the three black thumb screws on the platform connecting the 7900HT
instrument and the plate handler.
9 Release the plate from the plate handler arm.
a. Click Open Gripper.
b. Click Vertical Home.
10 Click Find Plate.
The plate handler arm lowers onto the plate.
11 Save the rotary and vertical offset information:
a. Click Rotary Offset, andclickYes.
The software records the rotary position for the plate drawer (Zymark position 2).
b. Click Vertical Offset, andclickYes.
The software records the vertical position for the plate drawer.
Now that the positions of the plate handler and instrument are fixed, the plate handler
stacks can be aligned and the positional values recorded.
To re-check the position of input stack 1 (Zymark position 4):
Step Action
1 Place an empty plate into input stack 1.
2 From the Zymark Twister Software, click the icon for stack 4.
The plate handler arm moves over the input stack.
3 Using the Vertical Positioning commands, lower the plate handler arm until it is 1 cm
above the stack and verify that it is centered on the stack. If necessary, center the
stack using the Rotary Adjustment arrows.
4 Carefully lower the plate handler arm into the stack. Center the gripper as it moves
down the stack by adjusting the Rotary Adjustment arrows if needed.
5 Once the plate handler arm is centered within the stack, click Find Plate.
The plate handler arm lowers upon the plate.
Confirm the following:
♦ The plate is in the middle of the gripper span.
♦ The plate sensor switch is contacting the plate.
♦ The gripper does not contact the side of the stack.
6 Click Close Gripper.
7 Click Vertical Home.
The plate handler raises the arm to its highest position. If the plate contacts the
sides of the stack, re-adjust the rotary position of the plate handler arm until the
plate moves freely within the stack.
Note Contact between the plate and the stack or all stacks may be unavoidable.
However, try to minimize the contact as much as possible.