Cleaning And Replacing Gripper Finger Pads - Applied Biosystems 7900HT User Manual

Chapter 7 Maintaining the Instrument

Cleaning and Replacing Gripper Finger Pads

When to Perform
Materials
Required
Cleaning the
Finger Pads
Replacing the
Finger Pads
7-52 Applied Biosystems 7900HT Fast Real-Time PCR System and SDS Enterprise Database User Guide
September 1, 2004 11:39 am, CH_Maintenance.fm
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.
Table 7-3 Materials Required for Replacing the Gripper Finger Pads
Material
Finger Pad Replacement Kit, containing 10 finger pads
Flat-blade screwdriver, small
Phillips head screwdriver, small
Isopropanol in a squeeze bottle
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.
1. Using the Phillips-head screwdriver, remove the two small Phillips-head screws
from the fingers on each side of the gripper, then remove the fingers.
Move the Plate Handler arm into any position where it is easy to access
Note:
the screws.
2. Using a small flat-blade screwdriver, pry the worn finger pads off the fingers.
The manufacturer recommends replacing all finger pads at the same
Note:
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.
The screws do not automatically align the grippers. Make sure that the
Note:
finger pads are making good contact with the plate when the arm grips a plate.
DRAFT
Part Number
4315472
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