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# Duplex Unit Not Detected

The duplex unit (optional) is not attached correctly. Follow the procedure below to attach the duplex unit (optional) correctly.

1. Re-attach the duplex unit (optional).

2. Move the duplex unit locks to the locked position.

3. If the [Test Paper Feed/Resume] key lights, press that key.

- Printing is not possible if the rear cover is not attached or the duplex unit (optional) has not been installed.