Lexmark C746 - Toner Specks; Transparency Print Quality Is Poor

Toner specks
Try one or more of the following:
MAKE SURE THERE IS NO WORN OR DEFECTIVE PRINT OR TONER CARTRIDGE
Replace the worn or defective cartridge.
MAKE SURE THERE IS NO TONER IN THE PAPER PATH
CONTACT CUSTOMER SUPPORT
If the problem continues, then the printer may need to be serviced.
Transparency print quality is poor
Try one or more of the following:
CHECK THE TRANSPARENCIES
Use only transparencies that meet the printer specifications.
CHECK THE PAPER TYPE SETTING
Make sure the paper type setting is set to Transparency:
1 From the printer control panel Paper menu, check the Paper Type setting.
2 Before sending the job to print, specify the correct type setting:
• For Windows users, specify the type from Print Properties.
• For Macintosh users, specify the type from the Print dialog.
Troubleshooting 250