Applied Biosystems 7900HT User Manual page 270

Chapter 7 Maintaining the Instrument
7-38 Applied Biosystems 7900HT Fast Real-Time PCR System and SDS Enterprise Database User Guide
September 1, 2004 11:39 am, CH_Maintenance.fm
4. Remove the plate and listen for the plate-sensor switch to disengage.
Did you hear the
switch disengage?
No
Yes
5. After the zero point is established, carefully turn the thumb wheel in the Down
direction the number of steps appropriate for your plate format as indicated
below:
Consumable
ABI P 96-Well Optical
RISM
Reaction Plate
ABI P 384-Well Optical
RISM
Reaction Plate
TaqMan Low Density Array
Note: If you lose count, begin again from step 4 and identify the zero point for
the switch.
6. Test the adjustment as explained on
DRAFT
1. Move the switch Down a few steps by turning the thumb
wheel in the direction indicated on the arm.
2. Replace the plate inside the gripper and listen for the
switch to engage:
– If you do not hear the switch engage, then remove the
plate and repeat steps 1 and 2 above.
– If you hear the switch engage, remove the plate and
continue to step a below.
1. Move the switch Up by turning the thumb wheel one step
in the direction indicated on the arm.
2. Replace the plate and listen for the switch to engage:
– If you hear the switch engage, remove the plate and
repeat steps 1 and 2 above.
– If you do not hear the switch engage, then you have
successfully identified the zero point of the
plate-sensor switch.
Note:
At the zero point, one step of the thumb wheel in the
Down direction causes the switch to engage.
Turn the thumb wheel in the Down direction...
page 7-39.
Then...
20 steps
15 steps
15 steps