6-12 WorkCentre Pro 421 User Guide
Image Quality Problems
Various situations can affect the quality of the output. Check
the following conditions to ensure optimum copy and print
performance.
If you still cannot resolve the problem, contact the Key
Operator or a local service representative.
- Do not locate the WorkCentre Pro 421 in direct sunlight or
near a radiator.
- Avoid sudden temperature and humidity changes in the
WorkCentre Pro 421’s environment. When a change
occurs, allow the WorkCentre Pro 421 at least two hours
to adjust its settings to the new environment, depending
on the severity of the change.
- Follow regular maintenance schedules for cleaning areas,
such as the Document Glass, CVT and output trays. Refer
to “Cleaning the WorkCentre Pro 421” on Page 5-2.
- If the copy quality is poor with uneven, faint, degraded
print or a white line is visible in the direction of the paper
feed, clean the Transfer Corotron Wire. Refer to “Transfer
Corotron Wire” on Page 5-4.
