HP C7769B Service Manual - Page 82
Try cleaning the Drive Roller using the Turn Drive Roller service, the Front Panel
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Service Tests and Utilities 6 It is possible that while performing this test, a Paper-Axis shutdown occurs, in which case the following message will be displayed: Paper Advance test System error 81:11 Paper-axis shutdown WARNING In this case, to resolve the problem, try the following: 1 Open the Window and check for any visible obstacles that could be restricting the movement of the Drive Roller. 2 Try cleaning the Drive Roller using the Turn Drive Roller service utility ⇒ Page 4-21. Also try cleaning the Drive Roller Gears. 3 Replace the Drive Roller ⇒ Page 8-86. 4 Replace the Gear Assemblies ⇒ Page 8-92. Only replace one component at a time and try the Service Test again before replacing another component. Using this procedure you will be able to determine exactly which component failed. 5 If the Drive Roller Encoder-Sensor test passes, the Printer will try turning the Drive Roller and the following message will appear on the Front Panel: Paper Advance test Moving Drive Roller. Please wait 6 Once the test is completed, the results will be displayed on the front panel: Test results Average PWM: XX Std dev PWM: X Average value of the PWM Standard deviation value of the PWM 4-12 HP DesignJets 500 and 800 Series Printers Service Manual