HP Enterprise CC490A manual Engine diagnostics, Heartbeat LED, Defeating interlocks

4.Press the down arrow to highlight the EMBEDDED JETDIRECT MENU option, and then press the OK button.

5.Press the down arrow to highlight the LINK SPEED menu, and then press the OK button.

6.Select the appropriate link speed, and then press the OK button.

Heartbeat LED

The heartbeat LED indicates that the formatter is functioning correctly. While the product is initializing after you turn it on, the LED blinks rapidly, and then turns off. When the product has finished the initialization sequence, the heartbeat LED pulses on and off.

Engine diagnostics

This section provides an overview of the engine diagnostics that are available in the HP Color LaserJet Enterprise CP4020-CP4520 Series product. The product contains extensive internal diagnostics that help in troubleshooting print quality, paper path, noise, component, and timing issues.

Defeating interlocks

Different tests can be used to isolate different types of issues. For component or noise isolation, you can run the diagnostic test when the front and right doors are open. To operate the product with the doors open, the door switch levers must be depressed to simulate a closed-door position.

WARNING! Be careful when performing printer diagnostics to avoid risk of injury. Only trained service personnel should open and run the diagnostics with the covers removed. Never touch any of the power supplies when the printer is turned on.

1.Open the right and front doors.

2.Insert a folded piece of paper into the right-door switch slot. Figure 3-1Diagnostic test (1 of 2)

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