HP 3500cp Service Manual - Page 94
Input Voltage for the Green and Blue LEDs, Users Guide, Lens Maintenance.
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8 If the test fails, a message similar to the following is displayed on the frontĆpanel. Green Fail V: 8.0 Blue Fail V: 11.0 T: 0 Refer to the following table in order to know the limits for value V (Saturated Input Voltage) for the Green and Blue LEDs: LED Green Blue V Minimum Maximum 7 10 7 12 If the test fails to resolve the problem, try one of the following: 1 The lens cover, which is installed on the line sensor, is dirty. Replace the lens cover ' Users Guide, Chapter 10 (Lens Maintenance). 2 Make sure that the Mark Encoder on the Drive Roller is clean. 3 Perform the Electronics test ' page 4Ć6. 4 Check if the Media used is suitable for the printer. 5 Check if the Line Sensor is installed and connected correctly. 6 If the problem continues, replace the Carriage Assembly ' page 8Ć42. 4-10 HP DesignJet CP Series Printers Service Tests