Old belt can not be fixed.
google it: FM3-1644 Intermediate transfer belt (ITB)* lifetime 1000 000
With belt replace also:
ITB inner cleaning scraper* FM2-2145
ITB end scraper FL2-2025
ITB cleaning brush roller* FC5-9156
ITB cleaning web* FC5-9197
ITB cleaning blade* FC6-4910
Primary transfer roller* FC6-1545
Secondary transfer roller* FC5-9252
It may be tired developer.Check condition of developer powder.
Check quality of paper.
Make a force stop to isolate fixing.
Post please a PG-10 test.
I have feeling.. this machine is too big for you.
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