Lexmark Optra C710 Service Manual - Page 159

5016-001 FRU 4 HVPS Grid Block 1 Grid Block 2 5 Fuser 6 Printhead Action Be sure the mounting screws in the HVPS are tight and the HVPS board is correctly seated against the high voltage contacts of grid block 2. Examine the contacts on grid blocks 1 and 2 for signs of contamination or damage. grid block 1 supplies the necessary high voltages to the print cartridges and ITM Unit, while grid block 2 supplies the high voltage to the ITM and Transfer Roll. Examine the HVPS board for signs of damage, especially to the jumpers that contact the grid block high voltage contacts. Check the hot roll and backup roll for signs of damage or heavy contamination. • If a problem is found, repair or replace the fuser assembly. • If no problem is found, check the discharge brush for buildup, replacing it if a problem is found. Dirt or dust on the lens or mirrors in the printhead can cause this problem. After all other checks have been made, replace the printhead assembly. Diagnostic Information 2-93