Top Page > Troubleshooting: TCRU/ORU > Image Quality Problem: Spots > Spots > Black (color) Spots (1) > Cause:
(a) Colored spots appear at 189 mm (7.5 inches) intervals
The drum is scratched or stained.
(b) Colored spots appear at 40 mm (1.6 inches) intervals
The charge roller is scratched or stained.