HP 750c Service Manual - Page 148

10. Pen Continuity The purpose of this test is to check for proper interconnection between the cartridge(s) and the carriage. For each cartridge, the plotter checks the connection between one address and all the primitives (PS =) and viceĆversa (addr sel =). Perform the pen continuity test as follows: 1 In the Service Tests submenu, scroll to 10 Pen continuity" and press Enter. SERVICE TESTS 10 Pen continuity 2 The Setting Voltages..." message is displayed on the frontĆpanel and the carriage moves to the right side of the plotter. 3 The Black Pen PS = # / addr sel = #" message is displayed on the frontĆpanel. If the value (#) of the Black Pen PS and addr sel is 0 then the cartridge has passed the test. If the value (#) of the Black Pen PS and addr sel is not 0 then the cartridge has failed the test. To resolve the problem, try one of the following: 1 Clean the interconnect pad in the carriage or the cartridge that failed the test. 2 Replace the cartridge that failed the test. 3 Perform the nozzle print test ' page 8Ć32. 4 Replace the carriage ' page 6Ć34. 750C 4 Use the Arrow buttons to select the next cartridge that needs to be tested. 750C Plus As each cartridge is tested, the Pen PS and addr sel value is displayed on the front-panel. If the 755 CM values given are not 0, then, to resolve the problem, try one of the troubleshooting tips given in step 3. 5 Press the Enter button when the test has been completed. 6 The Setting Voltages..." message is displayed on the frontĆpanel and the carriage returns to the service station. 8-30 Troubleshooting C4705-90000