Bio-Rad EXQuest Spot Cutter - Manual (Page 20)

2-7
SYSTEM INSTALLATION
To install or change the gel cutting head
1. Open the front door by lifting it all the way up and then lowering it until it latches.
2. Press the Change Cutting Tip button located on the lower right-hand side of the bezel. This will
cause the cutting head to move to the front of the cutting tray for installation.
3. If the membrane cutting head is installed, unplug its electrical connector from the PC board located
on the robot arm.
4. Unscrew the knurled thumbscrew on the robot vertical arm to disconnect the currently installed gel
cutting head or membrane head.
5. Disconnect the ¼-28 fitting by hand or use the ¼-28 fittings wrench, if needed.
6. By hand, or with the aid of the fittings wrench connect the 1/8 in tubing to the cutting head by way of
its ¼-28 fitting. Use the supplied 1/4”-5/16” open and wrench to prevent the gel tip from rotating.
7. Attach the gel cutting head to the robot with the knurled thumb screw included with the spot cutter.
8. Make sure the ¼-28 fitting is snug, but do not over tighten.
9. Tighten the knurled thumbscrew.
10. To close the door lift it slightly and then pull it down until it is closed.
2.7.2 Membrane Cutting Head
Figure 2-8. Membrane cutting head installation.
To install a membrane cutting head,
1. Attach the 1.0 membrane cutting tip to the membrane cutting head. Two wrenches (spanners) have
been included with the membrane cutting head for this purpose. First, install the cutting tip by
screwing it all the way on and then tightening the lock nut to hold the tip in place. Caution, the
membrane cutting tips are sharp.
2. Connect the membrane cutting head to the robotic arm with the 8-32 capscrew included with the
membrane head. Tighten the capscrew with a 9/64” hex wrench.
3. Plug the membrane cutting head power lead into its electrical connector. The connector is located on
the circuit board adjacent to the membrane cutting head solenoid. Plug the power lead into its
connector, as shown below, in the proper orientation.
Figure 2-9. Membrane cutting head electrical connector.
4. Connect the 1/8 inch tubing by way of its ¼ -28 connector to the female connector located on the
metal block above the cutting head attachment point.
Insert Connector
Alignment tab and groove
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capscrew