I have updated the tags on your post for better visibility . I have attached the 3396 manual to this posting. P/P refers to Print/Plot . Section 7-8 to 7-10 may help with diagnoses as it appears to be a printer mechanism problem. The 3396 is a reliable integrator as evidence by the fact you can still use yours. In North America, there is still an exchange service available for the 3396C Series III , but no other models.