User Guide

Individual component diagnostics
From the diagnostics menu, you can run tests to check the status of various components in the MFP.
During many of the diagnostic tests, the MFP enters a special diagnostics mode, which allows you to
send print jobs and interact with the menus. The MFP stays in this mode until you press Stop and
then touch EXIT DIAGNOSTICS at the top of the DIAGNOSTICS menu. In some cases, the MFP
must re-initialize after performing a component-level diagnostic test.
LED diagnostics
Use the following procedure to help identify the cause of high-level printer problems. These problems
are indicated by abnormalities in the printer's power-on sequence. The LED that the procedure refers
to is on the formatter. This is a “heartbeat” LED that blinks on and off when the formatter is operating
correctly. Use
Figure 7-12 Formatter LED on page 639 to locate the formatter LED.
1. Does the LED blink with four fast bursts at power on? If no, then perform the following checks.
●
Check the firmware.
●
Check the memory.
●
Check the formatter.
2. Does the LED blink at a fast, steady rate during memory testing (one blink per 8 MB)? If no,
then perform the following checks.
● Check the control panel display for an error code.
●
Check the memory.
●
Check the formatter.
3. Is the LED off for about eight seconds, while the boot code is decompressing, before the display
turns on? If no, then perform the following checks.
●
Check the firmware.
●
Check the control panel display for correct connections and operation.
●
Check the control panel display for an error code.
4. Does the LED blink at a steady rate of one blink per second? If no, then perform the following
checks.
●
Check the firmware.
●
Check the formatter.
●
Check the control panel display for an error code.
5. If the control panel display does not illuminate, perform an engine test to check the engine. You
must have paper loaded in Tray 2 for the engine test.
638 Chapter 7 Troubleshooting ENWW