Before you start:
- Familiarize yourself with Apple IIGS technical procedures
- Perform diagnostics per technical procedures
Perform the following in the event that diagnostics did not yield a serial
port failure:
Cure 1: A problem might exist with printer switch settings or Apple IIGS
Control Panel settings.
Action: Check DIP switch settings on printer and built-in control settings on
the computer (see note 1). Reconfigure switches and/or control settings in the
computer. Test the system by printing a file to the printer.
Cure 2: A problem might exist with the serial port circuitry that is not
being detected by performing diagnostics.
Action: Remove and replace the logic board with a known-good exchange module.
Test by printing a file to the printer.
Note 1: The Apple IIGS Control Panel settings can be reset to their defaults
by holding down the Ctrl - Command (Open Apple) keys and then pressing the
reset key. When the menu appears, select option #2, which says, "Set system
standards and 60Hz". The system then automatically re-boots.