HP 750c Service Manual - Page 138

Entering the Service Tests Menu System 1 Switch the plotter ON. Certain plotter failures that can occur will prevent the plotter from reaching the "STATUS / Ready for Media" state. If one of these problems occurs, switch the plotter OFF. Press and hold down the ENTER and the UP ARROW buttons while switching the plotter ON. This will allow access to the service tests. 2 Press the Enter button. 3 Use the Arrow buttons to scroll to the Utilities" menu display. Either the Short or Full menu mode will access the Service Tests" submenu. 4 Press the Enter button. 5 Simultaneously press the Enter and the Up Arrow buttons to access the Service Tests" submenu. 6 Use the Arrow buttons to scroll through the test selections. 7 Press the Enter button to begin a specific test when the required test is displayed. If no button is pressed for 1.5 minutes, the front panel will return to the "Status" menu. In some cases a quick press of a button may not be recognized by the processor. When pressing a button, be sure to press it deliberately and all the way to the bottom of its travel. If the plotter hangs up during a test, switch the plotter OFF and restart from step 1. In some cases the plotter may revert to the "STATUS" message upon exiting a test. To return to the service menu, perform the above steps. 8-20 Troubleshooting C4705-90000