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

Cleaning and Replacing Gripper Finger Pads
When to Perform The adhesive used to affix bar code labels to certain brands of microplates can build
up on the gripper pads of the Zymark Twister Microplate Handler. Over time, the
residue can cause the gripper pads to stick to the microplates while handling them,
causing misfeeds. To prevent buildup, inspect the gripper pads monthly and clean or
replace the pads as needed.
Materials Required The following materials are required to replace the finger pads:
Cleaning the
Finger Pads
Replacing the
Finger Pads
Material Part Number
Finger Pad Replacement Kit, containing 10 finger pads 4315472
Flat-blade screwdriver, small —
Phillips head screwdriver, small —
Isopropanol in a squeeze bottle —
! WARNING CHEMICAL HAZARD. Isopropanol is a flammable liquid and vapor. It may
cause eye, skin, and upper respiratory tract irritation. Prolonged or repeated contact may dry
skin and cause irritation. It may cause central nervous system effects such as drowsiness,
dizziness, and headache, etc. Please read the MSDS, and follow the handling instructions.
Wear appropriate protective eyewear, clothing, and gloves.
To clean the finger pads, wipe each pad thoroughly with Isopropanol until the residue
has been resolved. If the pads appear rough or the adhesive cannot be removed,
replace the pads as described below.
To replace the finger pad(s):
Step Action
1 Using the Phillips-head screwdriver, remove the two small Phillips-head screws
fromthefingersoneachsideofthegripper,thenremovethefingers.
Note Move the plate handler arm into any position where it is easy to access the
screws.
2 Using a small flat-blade screwdriver, pry the worn finger pads off the fingers.
Note The manufacturer recommends replacing all finger pads at the same time.
3 Clean any residual adhesive off the fingers using isopropanol.
4 Remove a replacement finger pad from the paper backing, and place the finger pad
on the appropriate finger position.
5 Repeat for the remaining finger pads.
6 Install the fingers with the fingers pointing down and the finger pads toward the
center of the gripper.
7 Insert the screws into the fingers and tighten.
Note The screws do not automatically align the grippers. Make sure that the
finger pads are making good contact with the plate when the arm grips a plate.
System Maintenance 7-43