Question. i own a refurbished konica 7055 model which i acquired in a surplus store here in the

Question

i own a refurbished konica 7055 model which i acquired in a surplus store here in the philippines. the machine has a problem now which the technician of a company where i bought were able to fix. the copies were blurred, dirty and it has a dark dot which is very visible in the edge of a paper.thank you, may you give me a tips on how to fix it.