Lexmark Optra C710 Service Manual - Page 153

5016-001 Low Image Density Service Check Note: Media which is out of specification, or media containing a high moisture content may cause this problem. FRU 1 Print Cartridges 2 Intermediate Transfer Unit (ITM) 3 Transfer Roller 4 High Voltage Contacts Grid Block 1 Grid Block 2 Action Run the print quality tests pages and determine the failing print cartridges producing light print or low image density. The toner cartridge may also be low on toner. Replace any failing cartridges. Be sure the ITM is installed correctly and the contacts on the ITM are contacting the grid block 1 and 2 high voltage contacts. If no problem is found try a new ITM unit. Note: The transfer roll is spring loaded against the inner cover so that it properly contacts the transfer belt in the ITM unit. Check the transfer roll for correct installation. Be sure the transfer roll rotates freely. Check the left and right side transfer roll springs and bushings for signs of binding or damage. Replace parts as necessary. Check the high voltage contacts in grid block 1 and 2 to ensure they are clean, not bent, deformed or pitted. If incorrect, replace the failing grid block assembly. Diagnostic Information 2-87