Apple 12/640PS manual Chapter

Check the Phillips screw holes on the back of the printer. The holes should be unobstructed. (You shouldn’t replace the Phillips screws until the side cover is properly positioned.)

If the hole is obstructed, remove the side cover and try again. It may take a few tries.

3With the back cover properly positioned, replace the Phillips screws. Do not overtighten the screws.

4Next, configure the printer software to use the additional memory.

For configuration instructions, see “Configuring Your Printer Software for New Options,” next.

If you want to check that you have properly installed the additional printer memory, turn the printer back on and check the startup page. The amount of printer memory should be listed there.

The printer does self-diagnostic tests each time it is turned on. During this testing, the printer verifies the amount of memory installed. If the diagnostics test determines that the installation is not correct, the Paper Out and the Paper Jam lights will flash alternately. Check that you have installed the SIMMs properly in the correct slots. If this does not resolve the problem, contact an Apple-authorized dealer.

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