HP LaserJet M9040/M9050 Service Manual - Page 367
Tray 4 diagnostics, Motor test, Standalone running test
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Tray 4 diagnostics Tray 4 can run standalone diagnostics to test the product motors, functionality, and sensors. You need one power cord, one #2 Phillips screwdriver, and a small flatblade screwdriver for the DIP switches. Motor test This test verifies that the three motors on Tray 4 are functioning correctly. 1. Identify the back cover (opposite from the tray door). Remove the four screws in the back cover. Remove the back cover. 2. Pull open the tray. 3. Set the DIP switches on the controller PCA to the motor-test mode as shown on the diagnostics label inside the Tray 4 back cover. 4. To turn the power-supply switch to the diagnostic mode, pull out on the blue handle. ● If the motors are working correctly, you will hear them as they rotate continuously. ● If the motors do not rotate, replace the corresponding FRU: either the paper pickup assembly or the paper-deck drive assembly. 5. To stop the test, return the power switch to the operational mode (push it in), and reset the DIP switches on the controller PCA to the off position. Standalone running test This test verifies that Tray 4 is functioning correctly. For this test, use the LED that is located on the controller PCA on Tray 4. NOTE: If Tray 4 is mounted underneath the product, jams might occur because the product will not pick up the media. To prevent excessive jams during this test, feed only six to eight pages. 1. Make sure that media is in the tray. 2. Set the DIP switches on the controller PCA for the standalone running mode as shown on the diagnostics label inside the Tray 4 back cover. 3. To set the power-supply switch to diagnostic mode, pull the blue power-supply switch outward. The motors start. Media should be lifted from the tray. If the unit does not work correctly, the lower service LED on the controller PCA flashes in a pattern that indicates the problem. (See User- and service-level diagnostics on page 322 for an interpretation of the LED patterns.) 4. To stop the test, return the power-supply switch to the operational mode, and set the DIP switches on the controller PCA to the off position (see Table 7-6 DIP switch settings on page 350). Open Tray 4, and remove any media from the paper path. ENWW Tray 4 diagnostics 349