LASER CLASS 730i/720i/710 Chapter 4: Maintenance and Service
4-35
• 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.
• Marks on back of papers
Solutions: (1) Copy a few white paper documents.
(2) If the marks are at intervals of approx. 46mm (1.81"), clean the
transfer charging roller, but if they are at intervals of approx. 66mm
(2.60"), clean the pressure roller.
(3) Clean the paper feed guide and fixing entrance guide.
(4) Replace the transfer charging roller.
(5) Replace the pressure 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 ass’y.
• Irregular and smudged black vertical lines
Solutions: (1) Clean the fixing entrance guide.
(2) Replace the toner cartridge.
• Irregular and smudged black horizontal lines
Solutions: If the irregular smudged black lines occur cyclically, replace the toner
cartridge. If they are non-cyclical, replace the fixing ass’y.
• Marks
Solutions: (1) If the marks are at intervals of approx. 46mm (1.81"), clean the
transfer charging roller; if they are at intervals of approx. 75mm
(2.95"), clean the fixing ass’y; and if they are at intervals of approx.
94mm (3.7"),or 38mm (1.5"), replace the toner cartridge.
(2) Clean the paper feed guide.
(3) Clean the fixing entrance guide.
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