Lexmark E352DN Service Manual - Page 53
Printhead service check, Transfer roll service check - printhead error
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4512-420, -430 Print quality problems (Continued) Problem Unexpected characters print or characters are missing. Jobs are not printing, and an error message is displayed. While in PostScript 3 emulation, the printer is flushing data (an error message is displayed). Cause / action • Ensure correct printer driver is being used. • Select hex trace mode to determine what the problem is. • Restore factory defaults. • Make sure the parallel cable or USB cable is firmly plugged in at the back of the printer. • The printer is waiting for an appropriate command. • Make sure the print cartridge assembly is installed properly. • Make sure the printer front cover is closed. • Ensure the correct PostScript driver is being used. • The printer doesn't have enough memory to print the job. Install more memory. Printhead service check FRU Printhead Note: New printhead must be aligned. See "Printhead assembly electronic adjustment" on page 3-8. Action Turn the printer off. Disconnect the printhead cables from J8 and J15 on the controller card. Turn the printer on with the front door closed. On the controller card, verify +5 V dc on pin 10 at J8 and +5 V dc on pins 1 and 2 at J15. Verify grounds on pins 2, 4, and 7 at J8 and on pin 4 at J15. • If voltages or grounds are incorrect, check the controller card. See "Controller card service check" on page 2-17 for more information. • If voltages are correct, replace the printhead (comes with cables). Transfer roll service check FRU Transfer roll Action Note: Do not touch the transfer roll except at its ends. Place a sheet of paper over the roll to prevent damage from finger oils or hand lotion. Check the springs in the left and right transfer roll bearings. Do not try to move the left spring. The bearing assemblies should support the transfer roll, applying evenly distributed forces to the PC drum. Replace the transfer roll assembly if the springs or bearings show signs of damage or fatigue. Inspect the transfer roll for signs of wear, damage or contamination. Replace as necessary. Diagnostics information 2-31