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

Zymark Twister Microplate Handler and Fixed-Position Bar Code Reader
Automation
Accessory
Troubleshooting
Table
Observation Possible Cause Recommended Action
Plate handler emits grinding
noise when picking up or
putting down plates
Plate handler arm contacts
racks when retrieving or
stacking plates
The plate handler arm
releases plates awkwardly
into the plate racks
Reaction plates tip or tilt
when placed into the
instrument tray by the plate
handler arm
Plate handler fails to sense
or grasp plates
Plates stick to the gripper
fingers of the plate handler
arm
Plate handler does not
restack plates in original
locations
Fixed-position bar code
reader not reading plate bar
codes
Vertical offset too low Re-align the plate handler as
Plate detector switch set too
high
Plate handler rotary offset is
incorrect or vertical offset is
too low
Plate sensor switch not
adjusted properly
Gripper pads on the fingers
of the plate handler arm are
worn or dirty
Gripper pads are worn or
dirty
Restack when finished
option not selected
Bar code reader is
mis-aligned
Bar code reader is broken
explained in “Aligning the
Plate Handler” on
page 7-32.
Adjust the plate sensor
switch as explained in
“Adjusting the Sensitivity of
the Plate Sensor Switch” on
page 7-28.
Change the gripper pads as
explained in “Cleaning and
Replacing Gripper Finger
Pads” on page 7-43.
Change the gripper pads as
explained in “Cleaning and
Replacing Gripper Finger
Pads” on page 7-43.
Configure the Automation
Controller Software to
restack the plates as
explained in page 4-37.
Re-align the fixed-position
bar code reader as
explained in “Aligning the
Fixed-Position Bar Code
Reader” on page 7-40.
Troubleshooting 8-17