Canon PC-D320, Service Manual

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PC-D320/PC-D340/FAX-L400 Chapter 4: Maintenance and Service
4-31
• Dots
Solutions:
(1) Clean the static charge eliminator in the toner transfer section.
(2) Check the static charge eliminator contact.
(3) Clean the transfer charging roller.
(4) Replace the transfer charging roller.
(5) Clean the transfer charging bias contact on the ECNT board
and the transfer charging roller shaft contact.
(6) Replace the ECNT board.
(7) Replace the SCNT board.
• Marks on back of papers
Solutions:
(1) Copy a few white paper documents.
(2) Clean the separation guide.
(3) Replace the separaton guide.
(4) If the marks are at intervals of approx. 45.2mm (1.78"), clean the
transfer charging roller, but if they are at intervals of approx. 62.8mm
(2.47"), clean the pressure roller.
(5) Clean the transfer guide, paper feed guide and fixing entrance guide.
(6) Replace the transfer charging roller.
(7) Replace the pressure roller.
(8) Clean the eject roller.
(9) Replace the eject roller.
• Black vertical lines
Solutions:
(1) Open the printer cover during printing, and remove the toner
cartridge. Open the cartridge drum cover shutter manually, and
check whether there are black vertical lines on the photosensitive
drum. If there are black lines, replace the toner cartridge. If not, go
the following step.
(2) Clean the fixing entrance guide.
(3) Replace the fixing film unit.
• Irregular and smudged black vertical lines
Solutions:
(1) Clean the fixing entrance guide.
(2) Replace the toner cartridge.