canon IR 2318L Light Print

Dear sir,
My Canon IR 2318L prints light. Copy & Printing result Light prints.
1. cleaned all mirrors, Lens.
2. cleaned polygon mirrror.
3. new toner bottle installed
4. new drum installed
5. new DC blade installed

still light print issue. Attaching herewith the original & printed image


Kindly Help
uclbph
original file.jpgscan.jpg