HP Color LaserJet Enterprise CP4020 Service Manual - Page 291
Manual sensor test 2 (special-mode test), DIAGNOSTICS, MANUAL SENSOR TEST 2
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Manual sensor test 2 (special-mode test) Use this test to test paper-path sensors and the paper-size switches manually. The following illustrations and table show the locations of these sensors. 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 2 option, and then press the OK button. Table 3-5 Manual sensor test 2 diagnostic tests Sensor or switch name Sensor or switch number O Tray 1 paper present sensor SR8 P Tray 2 paper present sensor SR25 Q Tray 2 paper surface 1 and 2 sensors SR23 and SR24 R Tray 2 paper size switches SW4 S Tray 3 paper present sensor SR3 (paper feeder) T Tray 3 feed sensor SR4 (paper feeder) U Tray 3 paper surface 1 and 2 sensors SR1 and SR2 (paper feeder) V Tray 3 paper size switches SW2 (paper feeder) W Tray 4 paper present sensor SR6 (paper feeder) X Tray 4 feed sensor SR7 (paper feeder) Y Tray 4 paper surface 1 and 2 sensors SR5 and SR8 (paper feeder) Z Tray 4 paper size switches SW3 (paper feeder) a Tray 5 paper present sensor SR11 (paper feeder) b Tray 5 feed sensor SR10 (paper feeder) c Tray 5 paper surface 1 and 2 sensor SR9 and SR12 (paper feeder) d Tray 5 paper size switches SW4 (paper feeder) The following items cannot be tested using the manual sensor test. 5 V laser and 24 V interlock switches SW1 and SW2 Power switch SW3 New ITB sensor SR10 Tray 3, 4, and 5 right door switch SW1 (paper feeder) To perform these tests, do the following: ● Remove the appropriate tray. ● 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. ENWW Tools for troubleshooting 259