HP Color LaserJet Enterprise CP4020 Service Manual - Page 305

Paper-path sensors test This test displays the status of each paper-path sensor and allows viewing of sensor status while printing internal pages. 1. Press the Home button. 2. Press the down arrow to highlight the DIAGNOSTICS, menu and then press the OK button. 3. Press the down arrow to highlight the PAPER PATH SENSORS option, and then press the OK button. 4. Select the paper-path test options for the test you want to run. NOTE: Print an internal page to view sensor activity. Table 3-7 Paper-path sensors diagnostic tests Sensor name Sensor number A TOP (top of page) sensor SR20 B loop 1 sensor SR14 C loop 2 sensor SR15 D fuser delivery sensor SR5 E duplex re-pick up sensor SR22 F output bin full sensor SR6 G Not used H Not used I developer alienation SR11 J fuser pressure-release sensor SR7 K primary transfer-roller-disengagement sensor SR9 L media sensor SR21 NOTE: The value for this test varies depending on the type of media used for the test. For example, a "1" displays for HP Multi-purpose paper; a "D" displays for HP Premium Choice 32lb paper. Print/stop test Use this diagnostic test to isolate the cause of problems such as image-formation defects and jams within the engine. During this test you can stop the paper anywhere along the product paper path. The test can be programmed to stop printing internal pages or an external print job when the paper reaches a certain position. The test can also be programmed to stop from 0 to 60,000 ms. If the timer is set to a value that is greater than the job-print time, you can recover the product in one of two ways. ● After the print job is completed press Stop to return to the DIAGNOSTICS menu before the timer times out. ● After the timer times out, press Stop. Activate the door switch to restart the engine and return it to a normal state. ENWW Tools for troubleshooting 273