HP LaserJet Enterprise M607n - Page 168

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Blinking: The control panel is not detected.
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Solid: The FFC between the formatter and DC controller is not connected or is damaged.
●
Red
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Solid: Valid SPI code; there is a problem releasing ASIC and running the BIOS
Solid: BIOS initiates PROSAC to change the LED from red to green.
Solid: PROSAC is not running (No ROM or SPI code).
◦
Blinking: Valid SPI code not found.
●
O: No 5V or 3.3V PROSAC power.
The following table describes the heartbeat LED operation when the printer completes the rmware boot
process and is in the Ready state.
Table 2-9 Heartbeat LED, printer operational
LED color Description
Green
●
Normal operation
◦
Formatter is operating normally
◦
Firmware is operating normally
◦
Control panel is connected
Yellow
●
Formatter cannot connect to the control panel
◦
Check control panel connections
◦
Verify control panel functionality
Red
●
Formatter error or failure
◦
Serial peripheral interface (SPI) ash memory boot error
◦
Power on self-test (formatter) failed
◦
Diagnostic (formatter) failed
O TIP: The heartbeat LED is o if the power cable is disconnected, the printer power switch is in the o
position, or the printer is in Sleep Mode.
●
Firmware or system freeze
◦
Check control panel for an error message
◦
Control panel failure
NOTE: This condition is not usually caused by a formatter failure. Turn the power o, and then on
again. If the error persists, perform a rmware upgrade.
142 Chapter 2 Solve problems ENWW