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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 3-1 Diagnostic test (1 of 2)
ENWW Tools for troubleshooting 243