HEWLETT PACKARD (HP) CLJ4500DN
Instrukcja Serwisowa

The paper path test allows the service technician to verify the operation of components within the paper path. When the test is initiated both the M1 and M2 are activated. You will see the ITB lift cams rotate once and the ITB drive gear turn briefly. The remaining portion of the test simply allows both the M1and M2 to run, thus exercising the gears and rollers associated with them. Note If an error occurs during the paper path test, the message PATH_1PAPER PATH TEST FAILED is displayed.

Developer test
The developer test rotates the carousel stopping at each toner cartridge and rotating the developer sleeve. For the best view of the carousel and the toner cartridge sleeves, remove the drum cartridge. The Top Front Drawer (Drum drawer) must be closed before the test can run. 1 2 Press the [Item] key until ENGINE DIAGS DEVELOPER TEST is displayed. Press the [Select] key to run the test. The front panel will display ENGINE DIAGS E2:DEVELOPER while the test is running. Watch the carousel and make sure toner cartridge developer sleeve rotates. The sequence will be black followed by a pause, then magenta, cyan, and finally yellow.

The test will last for approximately 35 seconds. While the Develop test is running you will see the drum turn if it is installed, as well as the drive gear for the ITB.

Drum test
The Drum test exercises the drum drive mechanism. Also, the fuser motor is turned on to allow the lift cams for the ITB to be rotated into the ITB up position. 1 2 Press the [Item] key until ENGINE DIAGS DRUM TEST is displayed. Press the [Select] key to run the test. The front panel will display ENGINE DIAGS E3:DRUM while the test is running.

Watch to see if the ITB lift cams turn and if both the drum drive gear and the ITB drive gear is rotating

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Troubleshooting tools

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