HP Designjet 2800/3800cp Service Manual - Page 100

D04. Media Axis (X-axis) The purpose of this test is to verify the operation of the components of the Media Axis. IF POSSIBLE ALWAYS PERFORM THIS TEST BEFORE REPLACING THE X-AXIS MOTOR. IF THIS TEST PASSES, DO NOT REPLACE THE X-AXIS ASSEMBLY. Perform the Media Axis test as follows: 1 In the Diagnostics submenu, scroll to "D04 Media Axis" and press Enter. Diagnostics D04 Media Axis 2 While the test is being performed, a row of "***" will be displayed on the front-panel. 3 If the test passes, the "D0400 OK" message is displayed on the front-panel. IF THIS TEST PASSES, DO NOT REPLACE THE X-AXIS ASSEMBLY. 4 If the test fails, an error message will be displayed on the front-panel. The error messages are split into different areas depending on which component failed. X-axis Failure If there is a problem with the components of the X-axis then the following messages will appear: D "D0401 Fail" - The Accuracy test has failed. D "D0402 Fail" - The PWM test has failed (PWM too low). D "D0403 Fail" - The PWM test has failed (PWM too high). In these cases, Replace the X-axis Assembly ' page 8-66. Mark Encoder Failure If there is a problem with the Mark Encoder then the following message will appear: D "D0404 Fail" - Problem finding the Mark Encoder. The test is continued on the next page. 4-14 HP DesignJet CP Series Printers Service Tests