HP 4550 Service Manual - Page 307
Table 7-31, Sensor status, Identifier, Description
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Table 7-31 Sensor status Identifier Name F Fuser * Activates (A) as well when opened. Description Detects if fuser is installed. Changes state if not detected or removed when rear door is opened and closed. 1 Press the [ITEM] key until ENGINE DIAGS DOOR SENSORS appears on the front panel. 2 Press the [SELECT] key to activate the test. The front panel will display A through F with a binary value below it. All the doors and drawers should be closed. In this state the display will show all 0's. Open the doors and drawers one at a time to verify correct functionality. If operating correctly, the 0 will change to a 1. If a 1 appears with all doors and drawers closed, there is a defective switch or connection. C7085-90921 Chapter 7 Troubleshooting 305