Apple LaserWriter 12/640 PS - Manual (Page 346)

Troubleshooting
m APU and LWU-W: restart the printer
m TCP/IP: reset the printer's TCP/IP interface
Managing page-description languages
m APU and LWU-W: download PostScript files
m APU and LWU-W: set the page-description interpreters to accept PostScript
or PCL, or to switch between them automatically
Configuring the communication ports
m APU and LWU-W: turn on or off the Ethernet port’s ability to interpret
NetWare messages
m APU and LWU-W: turn on or off the Ethernet port’s ability to interpret
TCP/IP messages
m APU and LWU-W: set EtherTalk communication settings
m APU and LWU-W: configuring the parallel port
Configuring options
m APU and LWU-W: turn automatic tray switching on or off
m APU and LWU-W: set the default sheet size for the multipurpose tray
Mac OS users can also configure some options in the Chooser by clicking the
Setup button.
321 Administrator Tools Quick Reference