Use imagewriter I with a LC575 How? Setup?

ImageWriter driver should be installed with the System Software.

You also need the mini Din8 to DB-25 cable (if I remember correctly, it is 590-0552)

Which OS are you running?

Steven

Edit: This should also be true for 7.5.5

Placing printer drivers in the System Folder
You must have a printer driver in your System Folder for each type of printer you want to use. If you used the Installer to add system software to a hard disk -- or to a floppy disk that you will use only with an ImageWriter printer -- you can skip this procedure. (The installation has already copied the appropriate printer drivers to the System Folder.) Open your System Folder and look for a file that has the name "ImageWriter".

Choosing a printer
You select the printers and other devices you want to use with a desk accessory called the Chooser.

1. Select Chooser from the Apple menu.The Chooser window appears.

2. Click the icon for the type of printer you want to use. The icons for printer types appear in the upper-left area of the Chooser. Youmay have to scroll to see the printer icon you want. In your case, you look for Imagerwiter.

3. ImageWriter is connected directly to your Macintosh(using the mentioned serial cable), so you select the printer and then specify which of the computer's two sockets, called ports, the printer will use. The Chooser displays a dialog box in which you select the icon forthe port to which your ImageWriter is connected. Choose the icon that's the same as the one above the port to which your ImageWriter is connected.