Download Apple LaserWriter 16 600 PS Service Source PDF

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The QuickTime movie below animates this cycle. • All LEDs on for one second • All LEDs off for one second • Failure error code for two seconds • All LEDs off for one second Caution: When you have finished running the Extended POST diagnostic, be sure to remove the serial loopback cable and set the configuration switch in its original position. Any readout other than those shown above is an unknown error that cannot be detailed any more specifically. Troubleshooting Printer Diagnostic (EPOST) - 6 I/O Controller Board Fuser Assembly ROM SIMM A Laser/Scanner Assembly RAM Size Misc.

See next page for a chart of failure error codes. Troubleshooting Printer Diagnostic (EPOST) - 5 If EPOST detects an error, the LEDs will cycle through the following sequence until you turn off the printer. The QuickTime movie below animates this cycle. • All LEDs on for one second • All LEDs off for one second • Failure error code for two seconds • All LEDs off for one second Caution: When you have finished running the Extended POST diagnostic, be sure to remove the serial loopback cable and set the configuration switch in its original position.

About 5-6 seconds into printer startup, all LEDs will again illuminate for one second. This marks the beginning of the Power-On Self Test (POST). POST is a diagnostic procedure built into the I/O controller board that tests four areas: the SIMM/CPU, the I/O controller, the engine, and a fax or hard drive, if present. As each checks passes, the leftmost LED extinguishes. When all four checks have passed, all LEDs remain extinguished for one second. The ready LED will then flash once. The Power-On Self Test then ends, and control passes over to the PostScript interpreter.

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