I was using the built-in TPU but decided to switch to the optional 4" x 5" transparency adapter. Now my documents are not being scanned correctly. What happened?

• You must power off the scanner first. Unplug the AC adapter from the scanner and then reconnect it. You should always turn off the scanner when switching between the built-in TPU and the optional 4" x 5" TPU (EU-33) in order for the scanner to correctly recognize which TPU is installed.