HP 750 - Manual (Page 150)

8-32 Troubleshooting C4705-90000
12. Nozzle Print Test
The purpose of this test is to check if the cartridge nozzles function correctly.
Perform the nozzle print test as follows:
Load media before performing this test.
1 In the Service Tests submenu, scroll to 12 Nozzle Print Test" and press Enter.
SERVICE TESTS
12 Nozzle print test
2 The Printing PRESS ENTER when pen finished" message is displayed on the
frontĆpanel while the plotter produces the nozzle print.
3 Press the Enter button when the test has been completed.
4 Check the nozzle print. If there is an interconnection problem you will notice some
primitives or addresses without any nozzles printed. If any nozzles are out, weak or
misdirected then the cartridge(s) will need servicing.
If any of the above problems are visible on the nozzle print, try one of the following:
When you have an interconnection problem:
1 Clean the interconnect pad in the carriage or the cartridge(s) that failed the test.
2 Replace the cartridge(s) that failed the test.
3 Replace the carriage ' page 6Ć34.
If the cartridge(s) need servicing:
1 Replace the cartridge(s) that failed the test and try the nozzle print test again.
2 If the problem occurs again, replace the service station ' page 6Ć42.