HP Color LaserJet Enterprise CP4020 Service Manual - Page 278
Manual sensor test (special-mode test), DIAGNOSTICS, MANUAL SENSOR TEST, EXIT DIAGNOSTICS
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Manual sensor test (special-mode test) Use this diagnostic test to manually test the product sensors and switches. Each sensor is represented by a letter and number on the control panel display. 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 MANUAL SENSOR TEST option, and then press the OK button. To exit this diagnostic, press the Stop button , and then select EXIT DIAGNOSTICS. Menus cannot be opened during this test, so the OK button serves the same function as the Stop button . Table 3-3 Manual sensor diagnostic tests Sensor or switch name Sensor or switch number A TOP (top of page) sensor B loop 1 sensor C loop 2 sensor D fuser delivery sensor E duplex re-pickup sensor F output bin full sensor G H I developer alienation J fuser pressure-release sensor K primary transfer-roller-disengagement sensor L media sensor M front door open N right door open SR20 SR14 SR15 SR5 SR22 SR6 Not used Not used SR11 SR7 SR9 SR21 SW5 SW6 When performing these tests, watch for the corresponding bit to toggle from 1 to 0 or 0 to 1. It can take a few seconds for bits to toggle. Table 3-4 Default state of bits Label A B C D E F G H I J K L M N Bit 1 1 1 1 0 0 0 0 0 1 0 0 0 246 Chapter 3 Solve problems ENWW
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