An Agilent 6890 GC autosampler Z-axis homing error can come from more than one part of the autosampler system. In this case, the customer’s autosampler was not functioning and injections could not be performed, even after a replacement injection tower had already been installed.

Our evaluation focused on the remaining autosampler components. During inspection of the carousel tray assembly, we found that the drive belt was torn and no longer able to transmit motion. The belt was replaced using a customer-provided part, but the carousel still failed to operate after reassembly and testing.

Additional diagnostics showed that the carousel drive motor was not activating. To verify the source of the failure, we installed a known-good carousel tray and tested the system again. With that assembly in place, the autosampler initialized normally, axis errors were cleared, and injection function was restored. This confirmed that the customer’s original carousel tray assembly had failed internally, while the replacement injection tower was functioning properly.