OKI C7350DTN User Manual

C7350/7550 User’s Guide: Maintenance   •  491
Changing the Image Drum 
When the image drum reaches the end of its product life, *** 
CHANGE DRUM
 is displayed in the control panel (*** is the color 
name). If printing continues without replacing the image drum, 
CHANGE ***** IMAGE DRUM is displayed and printing is 
cancelled.
Change the toner cartridge and clean the LED head at the same 
time as changing the image drum.
Image drum life is approximately 23,000 sheets of letter-size 
media. This assumes a...

C7350/7550 User’s Guide: Maintenance   •  492
3.Remove the appropriate image drum/toner cartridge from the 
printer.
  ugc7_038.jpg  
4.Make sure the replacement image drum is the correct color and 
remove it from the packaging.
5.Remove the protective sheet from the new image drum.
  protective sheet remove1.eps  and protective sheet remove2.eps 
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C7350/7550 User’s Guide: Maintenance   •  493
6.Install the new image drum in the printer.  ugc7_133.jpg  
7.Push the tab inwards and remove the blanking plate from the 
image drum.
  blanking plate remove.eps 
8.Install a new toner cartridge.  See “Changing the Toner 
Cartridge” on page 484.
9.Close the top cover.
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C7350/7550 User’s Guide: Maintenance   •  494
Changing the Transfer Belt
When the transfer belt reaches the end of its product life, CHANGE 
BELT UNIT is displayed in the control panel. Transfer belt life 
depends on the number of sheets per print job. When single sheets 
are printed, transfer belt life is reduced.  
1.Turn off the printer.
2.Open the top cover.
  open top cover.eps  
3.Remove the cradle (complete with the four image drums and 
toner cartridges) from the printer.
  image drum set...

C7350/7550 User’s Guide: Maintenance   •  495
4.Press back the lock lever (1).  
5.Use the handles (2 and 3) to remove the old transfer belt from 
the printer.
 transfer belt remove.eps 
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C7350/7550 User’s Guide: Maintenance   •  496
6.Remove the new transfer belt unit from its packaging.
7.Using the handles (2 and 3), align the pins (4) with the grooves 
(5) on the printer and insert the new transfer belt into the 
printer.
  transfer belt replace.eps  
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C7350/7550 User’s Guide: Maintenance   •  497
8.Move the lock lever (1) toward the front of the printer.
Make sure it locks the transfer belt into place.
9.Reinstall the cradle complete with the four image drums and 
toner cartridges in the printer.
 image drum set replace.eps  
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C7350/7550 User’s Guide: Maintenance   •  498
10.Close the top cover.   close top cover.eps  
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C7350/7550 User’s Guide: Maintenance   •  499
Changing the Fuser
 
When the fuser unit reaches the end of its product life, CHANGE 
FUSER UNIT is displayed in the control panel. Fuser unit life is 
approximately 60 000 A4 sheets.  
1.Turn off the printer.
2.Open the top cover.
 open top cover.eps 
WARNING!
The fuser unit is very hot after printing. Always use 
the handle when lifting it.
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C7350/7550 User’s Guide: Maintenance   •  500
3.Move the two locking levers (1) to the rear of the machine to 
release the fuser unit.
  fuser unit remove.eps 
4.Use the handle (2) to remove the fuser unit from the printer.
5.Remove the new fuser unit from its packaging.  Lift off the 
shipping tape at either end. As you remove the tape, the levers 
at either end of the fuser should move into the locked position.
(1)
(1)
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