HP C7769B Service Manual - Page 80

Service Tests and Utilities PHONE SUPPORT Paper Advance Test The purpose of this test is to identify whether there is too much friction in the paper-axis drive system which is caused by defects with the Transmission Gears, Drive Roller or the Paper-Axis Motor. This test should be performed when a Paper-Axis shutdown occurs which is not caused by a paper jam. NOTE The Paper Advance test will perform the following tests: n Paper-Axis Motor test. n Drive Roller Encoder-Sensor test. n Drive Roller test. This Service Test can be performed by the End User with the guidance of a HP Support person via the phone. WARNING IF POSSIBLE ALWAYS PERFORM THIS TEST BEFORE REPLACING PAPER-AXIS COMPONENTS. IF THIS TEST PASSES, DO NOT REPLACE ANY PAPER-AXIS COMPONENTS. Perform the Paper Advance test as follows: 1 In the Service Tests submenu, scroll to "Paper Advance test" and press Enter. Service tests Troubleshooting Aerosol Fan test Ink Supply Station Paper advance test Carriage movement test Menu Back Enter 2 The test will first check if the Paper-Axis Motor is working by moving it slightly backwards and forwards. If this test passes, the following message will be displayed (press Enter to continue to the next stage of the test): Paper Advance test Menu Paper-axis motor test passed. Press ENTER to continue Back Enter WARNING IF THIS TEST PASSES, DO NOT REPLACE THE PAPERAXIS MOTOR. 4-10 HP DesignJets 500 and 800 Series Printers Service Manual