20 Most Recent Lexmark T642 Laser Printer Questions & Answers

You need to be sure you add the duplex unit and tray unit in the windows driver. The "device" tab will allow you to add the duplex and tray to the
printer.

The printer is not hooked up to the wireless network. It will work if hooked up with an ethernet (hard wire) cable. Anyway, it is a royal PIA to set up - let him take care of it.

It could be the connector to the fuser from the LVPS is not connected properly. It could also be the Thermistor on the fuser is bad.

Make sure that the exit flag is moving freely. It sounds like it is stuck in the up position or popped out of place. The flag is located on the left side of the output bin and should be hanging down

hello This solution was tested for x 204. Get the right cover of the printer. See the fan. Fan connector is located to the card enters the socket. Socket located at the bottom part of the written 4R7. Install this part by removing the 4.7 ohm resistor. The problem is solved.

http://www.lexmark.com/publications/pdfs/t640/eng/ug.pdf You will find your answer in that manuel. Have a nice day

The reason that your printer is asking you to load paper into the MPF is that it doesn't think it has that size paper in tray 1 or 2. Make sure that the green paper guide in the paper tray that you want to print from is latched in the correct position. This guide tells the printer what size paper is in the tray. If you have it even slightly out of position you'll get this message.