Lexmark 4079 colorjet printer plus Service Manual - Page 37

Paper 005 - Visually check the paper feed parts. Is the pickup roller clean and free of paper dust? Yes No 1006 Clean the roller using cleaning cloth and isopropyl alcohol. 007 Check the paper sensor signal at CNPE pin 1 on the right connector card, with the connector plugged in. (See "Right Connector Card" on page 4-2). You can manually feed paper to check this signal. Push the paper l ift spring clutch plate (Asm. 20-10) to the right, and turn the reap eject roller (Asm. 18-2). The spring pate is under the carriage shaft, to the left of the carriage motor Voltage should be high (4-5 V) when the paper sensor arm blocks the light path (paper is not present). Voltage should be low ( < 2 V) when the paper sensor arm does not block the light path (paper is present). Is the voltage correct? Yes No 008 Replace the paper sensor or the paper sensor cable as needed, 009 I Replace the logic board Diagnostic informatic; 2.17