Top Page > Troubleshooting: TCRU/ORU > Image Quality Problem: Full Page > Uneven Density > Uneven Density: 189 mm (7.5 inches) Pitch > Cause:
If the machine is left unattended for a long period in an environment where temperature and humidity are high, corona products on the photoconductor unit absorb moisture to prevent a buildup or removal of static electricity on the photoconductor unit.