HP 8550 Service Manual - Page 538

User and service LEDs User LED The condition of the user LED (LED1) in the unit enables you to check operational conditions. l Continuous green light-the unit and the printer assembly are communicating normally. l Flashing orange light-a paper jam has occurred, a door is open, or another condition requiring operator intervention has occurred. l Continuous orange light-breakdown. The user LEDs operate only when the DIP switches are all off or in the factory default position for normal operation. Service LEDs The combination of DIP switch settings and service LED (LED202) lighting makes it possible to check the operational condition of the side HCI. During normal operation the DIP switches are in the following state: SW201-1 Off SW201-2 Off SW201-3 Off SW201-4 Off The service LED repeats a cycle consisting of 0.5 seconds on and 0.3 seconds off when the unit is operating normally. When an error occurs, the service LED flashes in the cycle shown below: header (1.0 seconds on, 0.2 seconds off), detected error details (0.3 seconds on, 0.2 seconds off), and pause (2.0 seconds off). Figure 416. Figure 5-102 536 Chapter 7 - Troubleshooting EN