HP 3015 Service Manual - Page 253
Functional checks, Control-panel test, Half self-test functional check
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Functional checks Note Note Use the following procedures to help diagnose and solve problems that occur in the print engine. Control-panel test Perform this procedure as quickly as possible in order to complete the control-panel check before the formatter begins communicating with the control panel. The control-panel test continues until all of the buttons have been tested or until the formatter attempts to communicate with the control panel (after approximately 40 seconds). The control-panel test will be interrupted if it is not completed before communication occurs. 1. Turn the product power on by using the power switch. 2. Immediately press the > and CANCEL buttons simultaneously. 3. Press and hold down the > and CANCEL buttons until the message Passed MEM Test appears on the control-panel display. 4. Release the > and CANCEL buttons. 5. Press the MENU/ENTER button to test the control-panel display LEDs. Continue to press MENU/ ENTER until the message Scroll Check--Press Enter To Pass appears on the controlpanel display. 6. Press MENU/ENTER again. 7. The name of a control-panel button will appear on the control-panel display. Press the corresponding button on the control panel. Repeat this step until all of the control-panel buttons have been tested. The control-panel test continues until all of the buttons have been tested or there is no activity at the control panel for about 20 seconds. After testing all of the control-panel buttons (or when there is no activity at the control panel for about 20 seconds), the product exits the test and continues the startup processes. Half self-test functional check The purpose of the half self-test check is to determine which image-formation process is malfunctioning. The image-formation process can be subdivided into the following stages: ● conditioning stage (charges the drum) ● writing stage (writes a latent image to the drum with the laser) ● development stage (forms a toner image on the drum) ● transfer stage (transfers the image to paper) ● separation stage (separates the media from the drum) ● fusing stage (applies heat and pressure to make the image on paper permanent) ● cleaning stage (removes excess toner from the drum) To perform a half self-test check 1. Print a self-test page. (See Troubleshooting tools.) ENWW Functional checks 235