HP LaserJet Enterprise 500 Service Manual - Page 287

NOTE: When the initialization process completes the connectivity LED should be illuminated solid green-the LED is off if the product is in Sleep mode If after initialization the connectivity LED is not solid green, see Connectivity LED, product operating on page 252. Table 3-4 Connectivity LED, product initialization Product initializing state Connectivity LED, normal state Connectivity LED, error state No power (power cord unplugged or power button off) Power on (immediately after the power button pressed) Off Red, solid ● Duration should be 1 second or less Not applicable Red, solid ● Firmware error; problem finding hardware and booting the serial peripheral interface flash memory ◦ Boot process halted Serial peripheral interface (SPI) flash memory boot Green, solid Replace the formatter. Red, solid ● Firmware error; problem corrupt or missing SPI flash memory ◦ Boot process halted HW checks on board DRAM Green, solid Replace the formatter. Red, solid ● Power on self check failure ◦ Boot process halted Control panel connection initializes Preboot menu available (including diagnostics) Replace the formatter. Green, solid Yellow, fast flash NOTE: Control panel communication successful. If an error occurs, a message should appear on the control-panel display. ● Formatter to control panel connection failed ◦ Boot process continues Check the cables between the formatter and control panel for damage. Make sure that the cables are fully seated. Green, solid Red, solid ● Diagnostic failure ◦ Follow diagnostic instructions Turn the power off, and then on again to restart the initialization process. ENWW Tools for troubleshooting 251