Apple LaserWriter 12/640 PS - Manual (Page 26)

5 Check the status lights.
After the startup page is printed, the Ready/In Use light glows steadily. All
other lights should be off. If any other lights are on, see Chapter 11.
Saving energy
When you save energy, you save our natural resources and reduce pollution.
If you’re concerned about energy consumption, you can take advantage of the
printer’s built-in energy-saving feature. The printer enters an energy-saving
mode 10 seconds after finishing printing.
You can also save energy on the LaserWriter 12/640 PS, as well as on all
other printers (including those without energy-saving features), by taking
these steps:
m If you know you won’t be using the printer for a while—say, overnight—
turn it off.
m Use the page preview feature provided in many programs to check page
layout rather than printing a draft.
Ready/In Use light
Paper Out light
Paper Jam light
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26 Chapter 1