When your Lisa informs you it's having difficulties printing your document,
check everything suggested by both the dialog message and the manual, and then
try the following.
1. Open Preferences and click on Connect devices. Select each of the
connections (e.g., Serial A Connector), and set each to Nothing.
2. Re-select each of the connecions in Connect Devices, and select what you
physically have connected to the Lisa at that connection.
3. Click on Select Defaults in Preferences and make your printer the default
printer.
4. Open your document and choose Format for Printer from the File/Print menu.
Click on the "New Printer..." button, then select a printer different from
what is currently selected (a new default printer). Finally, select Format
for Printer and choose the printer you wish to print the document on.