HP 450c Service Manual - Page 38

Service Tests (Diagnostics) The following is a list of all internal service tests available in the Printers. Instructions for entering service mode 1 are given on page 4Ć6. Instructions for entering service mode 2 are given on page 4Ć22. 1 Bail Cycle Test ' page 4Ć8 This tests the operation of the bail system, Service Station and the YĆaxis by engaging and disengaging the bailĆlift mechanism and capping/uncapping the cartridges to ensure a correct lifting action. 2 Front Panel Test ' page 4Ć9 The purpose of this test is to verify the operation of the frontĆpanel keys and LEDs. 3 Carriage Axis (YĆaxis) Test ' page 4Ć10 The purpose of this test is to verify the operation of the components of the Carriage Axis. 4 Carriage Test ' page 4Ć12 The purpose of this test is to verify the operation of the Carriage subsystems, like the Line Sensor and analog multiplexer. This test also checks the connection between the carriage flex circuit and the cartridges. 5 Sensors Test ' page 4Ć15 This tests the operation of the cover sensor, pincharm sensor and media sensor. 6 MediaĆAxis (XĆAxis) Test ' page 4Ć16 The purpose of this test is to verify the operation of the components of the Media Axis. 7 Bench Run ' page 4Ć18 This test has been designed to be used during the manufacturing stage and not in the field. do not at anytime enter this test when troubleshooting the Printer. 8 Modular Test ' page 4Ć19 This test has been created to check the interaction between various components of the Printer. It combines the following tests: D CarriageĆaxis test. D Carriage test. D MediaĆaxis test. D FrontĆpanel test. D Sensors test. 4-4 HP DesignJet 430, 450C and 455CA Printers Service Tests