Table 3-19 Heartbeat LED, product initialization (continued)
Product initializing state Heartbeat LED, normal state Heartbeat LED, error state
Approaching Sleep Mode Green, slow blink Not applicable
Wake up from Sleep
Mode
Follows initialization progression Follows initialization progression
Approaching wake up
from Sleep Mode
Follows initialization progression Follows initialization progression
Heartbeat LED, product operational
The following table describes the heartbeat operation when the product completes the firmware boot
process and is in the Ready state.
Table 3-20 Heartbeat LED, product 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) flash memory boot error
◦
Power on self test (formatter) failed
◦
Diagnostic (formatter) failed
Off TIP: The connectivity LED is off if the power cable is disconnected, the product power switch is in the
off position, or the product 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 off, and then on
again. If the error persists, perform a firmware upgrade.
Engine diagnostics
This section provides an overview of the engine diagnostics that are available in the HP Color LaserJet
Enterprise M750 Printer Series product. The product contains extensive internal diagnostics that help in
troubleshooting print quality, paper path, noise, component, and timing issues.
276 Chapter 3 Solve problems ENWW
To Next Page
Loading...