Turret changing procedure for 7683B autosampler

This procedure explains how to get GC and injector to recognize turret has been changed on 6890 GC:

If the customer powers OFF the GC and changes the turret and then powers ON the GC. The Injector and the GC won't know that you changed the turret. Must always open and close door on injector while powered ON for the injector and GC to learn about the change.

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