HP 8550 Service Manual - Page 540
Sensor and switch tests, Run sensor or switch test
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Sensor and switch tests To enter the sensor check mode, set the DIP switches to the following settings: SW201-1 Off SW201-2 Off SW201-3 On SW201-4 On Then, turn on the side HCI. Using the sensor check mode, check the state of the five sensors and five switches listed below. Sensors l Upper cover open detection sensor (PS1) l Second-sheet detection sensor (PS2) l Paper detection (PS3) l Lifter upper limit detection sensor (PS4) l Feed sensor (PS5) Switches l Deck set detection switch (MS1) l Lifter lower limit detection switch (MS2) l Paper-size detection switch (MS3) l Remaining paper detection switch 1 (SW601) l Remaining paper detection switch 2 (SW602) Run sensor or switch test 1 Turn off the HP Color LaserJet 8550 (use the power switch on the copy module). 2 Remove the rear cover. 3 Set the DIP switches as follows: SW201-1 Off SW201-2 Off SW201-3 On SW201-4 On 4 Pull the side HCI away from the printer. 5 Open the upper right cover. 6 Turn on the HP Color LaserJet 8550 (use power switch on the copy module). 538 Chapter 7 - Troubleshooting EN