Gestetner f250 Operating Guide

T

ROUBLESHOOTING

8.15

If black vertical streaks appear on the page:

• The drum inside the toner cartridge has probably been 

scratched. Remove the toner cartridge and install a new one. 
See “Replacing the Toner Cartridge” on page 7.9.

If the amount of background shading becomes 
unacceptable:

• Change to a lighter weight pages. See “Paper Specification” 

• Check the machine’s environment; very dry (low humidity) or 

high humidity (higher than 80% RH) conditions can increase 
the amount of background shading.

• Remove the old toner cartridge and install a new one. See 

• Clean the inside of the machine. See page 7.4.
• Check the paper type and quality. See “Paper Specification” 

• Remove the toner cartridge and install a new one. See 

If marks repeatedly appear on the printed side of the page 
at even intervals:
• The toner cartridge may be damaged. If a repetitive mark 

occurs on the page, print a cleaning sheet several times to 
clean the cartridge; see “Cleaning the Drum” on 
page 7.11. After the printout, if you still have the same 
problems, remove the toner cartridge and install a new 
one. See “Replacing the Toner Cartridge” on page 7.9.

• Parts of the machine may have toner on them. If the 

defects occur on the back of the page, the problem will 
likely correct itself after a few more pages.

• The fusing assembly may be damaged. Contact a service 

representative.

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