Dionex ASE 100, Operator'S Manual

Page: 83 / 150

5 • Service
Doc. 031842-01 5/02
5-13
e. Pull the trim panel completely off, exposing the inner front panel,
and set the trim panel aside.
6. Remove the right side panel of the ASE 100:
a. Using a Phillips screwdriver, remove the two screws on the inner
front panel, near the needle assembly (see Figure 5-5).
b. Insert a screwdriver into the hole located between the two screw
holes (see Figure 5-5). Push the screwdriver in until the right side
panel slides back about 1/2 inch. To prevent scratches or other
damage, do not let the panel fall onto the workbench.
c. Remove the right side panel from the system and set it aside.
7. Disconnect the red tubing and the transparent blue tubing from the
two black elbow press fittings on top of the pump.
8. Using a 1/4-inch open-end wrench, disconnect the stainless steel
fitting from the outlet check valve (see Figure 5-6).
9. Disconnect the PEEK fitting from the inlet check valve (by hand).
10. Disconnect the gray cable from the pump PC board.
11. Remove the two screws in the end plates (see Figure 5-6) that secure
the pump to the component panel.
5.5.2 Replacing the Piston Seal
1. Using a 3-mm hex driver or wrench, loosen and remove the two
screws securing the pump head to the body.
2. Slide the pump head straight off the pump.
3. Turn the pump head upside down. The tan piston guide should drop
out of the head; if it does not, gently tap the head on the lab bench to
dislodge the guide. Save the piston guide (it will be reinstalled in
Step 7).
Lateral motion while disengaging the pump head from the pump may
break the piston.