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4-14

Diagnostic Tests and Utilities

HP Designjet 4000/4020 Printer Series Service Manual

6 The Printer will now test the Media Drive moving in an open loop in one

direction and the following message will be displayed on the Front Panel.

Press any key to continue the test:

Check that the movement done is more than 100 encoder units (in absolute

value). If the movement done is less than 100 encoder units then open the

Window and check for any visible obstacles restricting the movement of the

Drive Roller or the Overdrive Assembly. In this case, press any key to finish

the test.

7 The Printer will now test the Media Drive moving in an open loop in the

opposite direction and the following message will be displayed on the Front

Panel. Press any key to continue the test:

Check that the movement done is more than 100 encoder units (in absolute

value). If the movement done is less than 100 encoder units then open the

Window and check for any visible obstacles restricting the movement of the

Drive Roller or the Overdrive Assembly.

If the Encoder Units is less than 100, the Printer will request you to follow

these instructions:

a Manually load a sheet of paper in to the Printer (an A4 sheet).

b The Printer will test the Media Drive moving in an open loop.

c Perform a visual check during the test. The Front Panel will ask you if the

paper moved or not:

– If the paper moved, the Front Panel will display System Error Code

56:10. For more information on troubleshooting this error code, refer

to Page 2-17.

– If the paper did not move, the Front Panel will display System Error

Code 41:10. For more information on troubleshooting this error code,

refer to Page 2-13.

d A "FAIL" message will be displayed on the Front Panel and the test will be

terminated at this point.

HP 4000 User Manual

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