[Error Code] Minolta DI 350 displaying C0990

[vonhetcchtel]

Hi,
This DI 350 has not been working for the past one month
because the Toner was finished and had to be imported. When I got the
Toner, I put it in the Toner Refill position but when the copier was turned on,
it displayed CO990. After putting it on and of thrice, it copied some few copies. The next day the copier displayed the same code: C0990 and it did not clear.
Please help out with this one.
Thanks in advance

[mo0651]

co-990 is a paper tray error. Do you have a large capacity tray? look to see how paper is loaded.