5 • Service
Doc. 065330-05 03/2020
107
3. Plug the pump connector into the CPU board.
4. Reinstall the rear panel with the six screws previously removed.
5. Reconnect the pump’s compression fittings and tubing.
6. Reconnect the power cord and turn on the Dionex AutoTrace 280 power.
7. Select the Calibrate Pump diagnostic method:
a.
Press
LOAD
to display the
LOADING METHOD
screen.
b. Press
LOAD
to increment the displayed method to 31.
c.
Press
CONT
once to select method 31.
8. Press
CONT
to run the method. Follow the on-screen instructions as they
appear.
5.12 Replacing the 12-Port Valve Rotor
Replace the rotor in the 12-port valve if fluid leaks from underneath the stator.
Parts and Tools Needed
•
7/64-in hex wrench
•
12-port valve rotor (P/N 072592)
Remove the Defective Rotor
1. Use the 7/64-in hex wrench to remove the three hex screws on the front of the
valve, and then remove the stator from the valve. (It is not necessary to
remove all the fittings; only those required to gain access to the hex screws.)
2. Remove the spacer ring from the valve.
3. Grasp the edges of the rotor and pull it out of the metal cup on top of the drive
shaft. If necessary, use the three tabs on the outside of the rotor for a better
grip.
4. Inspect the stator sealing face to verify that it is smooth and free from
scratches or other defects. Burrs on the stator may scratch the new rotor. If the
stator is defective, it will have to be replaced after the rotor is replaced.
