Old Operating System Manual
- Press 2nd 0 to enter the CATALOG menu.
- Press x-1 to navigate to the D section of the catalog.
- Press the down arrow key to scroll down until DiagnosticOn is highlighted.
- Press ENTER twice.
Special note about turning diagnostic values on
You only need to turn on these values once, and they will remain on until you remove the batteries or clear the RAM. If you remove the batteries or clear the RAM, you will need to repeat this process.