OKI C7350DTN User Manual

C7350/7550 User’s Guide: Maintenance   •  501
6.Using the handle (2), install the new fuser unit into the printer. 
Make sure the two spring loaded locking levers (1) lock the fuser 
unit into place.
 fuser unit replace.eps  
7.Close the top cover.
 close top cover.eps  
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C7350/7550 User’s Guide: Maintenance   •  502
Cleaning the LED heads
 
Clean the LED heads when printing does not come out clearly, has 
white lines or when text is blurred.
1.Turn off the printer.
2.Open the top cover.
 open top cover.eps  
CAUTION!
Do not use methyl alcohol or other solvents on the LED 
heads.  These solvents damage the lens surface.
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C7350/7550 User’s Guide: Maintenance   •  503
3.Gently wipe the LED head surface with LED lens cleaner or soft 
tissue.
  LED head clean.eps 
4.Close the top cover.  close top cover.eps 
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C7350/7550 User’s Guide: Moving (Shipping) the Printer   •  504
Moving (Shipping) the Printer
  
This printer is a precision machine. 
Moving the printer without the protective packaging may damage 
the printer.  
To prepare the printer for moving:
1.Turn off the printer.
2.Disconnect the power cable from the printer.  
3.Disconnect the printer interface cable from the printer.
4.Remove any paper from the paper trays.
5.Open the top cover.  Remove the four image drums.
 image drum remove 2.eps 
WARNING...

C7350/7550 User’s Guide: Moving (Shipping) the Printer   •  505
6.Seal the aperture on each image drum and its toner cartridge 
with plastic adhesive tape (1).
This prevents any toner from spilling during moving. 
 image drum seal.eps 
7.Place the four image drums (complete with their toner 
cartridges) back into the printer.
8.Use the original packaging materials that came with your 
printer.
Place the printer inside its box and seal the box. 
  
WARNING
This printer weighs 106 lbs. (48 kg). 
Two people...

C7350/7550 User’s Guide: Troubleshooting   •  506
Troubleshooting
Messages on Control (Front) Panel Display
The control (front) panel has a liquid crystal display (LCD).
The display indicates the printer status and if there is a problem 
with the printer. 
The messages (status and error) are listed below, together with an 
explanation of what each message means:                         
List of Messages
The messages are listed in alphabetical order.
  
Display MessageMeaning
1
***** DRUM NEAR LIFE  An...

C7350/7550 User’s Guide: Troubleshooting   •  507
14CHECK BELT UNITCheck the transfer belt for paper jam, 
correct installation, etc.
15
CHECK DUPLEXCheck the duplex unit for paper jam, 
correct installation, etc.
16CHECK FUSER UNITCheck the fuser unit for paper jam, correct 
installation, etc.
17
CHECK IMAGE DRUMCheck the image drum for correct 
installation, etc. Color is indicated.
18COLLATE FAILCollating of multiple copies has failed.
19
COLOR ADJUSTINGAdjusting head so that colors do not shift 
on...

C7350/7550 User’s Guide: Troubleshooting   •  508
35
INSTALL PAPER CASSETTEInstall the paper cassette.
Paper tray is indicated.
See “Loading Paper” on page 32.
36INVALID DATAData is incorrect.
37
LOADLoad correct paper size/type.
Size/type is indicated. 
See “Loading Paper” on page 32.
38MEDIA MISMATCHPaper type set via menu does not match 
that sent via driver.
39
NETWORK ERRORNetwork error.
40OFFLINEShows offline status.
41
ONLINEShows online status.
42OPEN UPPER COVEROpen the upper cover.
43
PAPER...

C7350/7550 User’s Guide: Troubleshooting   •  509
57
UNSUITABLE SIZEIndicates wrong paper size.
58USB I/F ERRORUSB interface error has occurred.
59
WARMING UPThe printer is warming up.
Display MessageMeaning
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C7350/7550 User’s Guide: Troubleshooting   •  510
Repeating Asterisk (*) Symbol
An asterisk (*) symbol appears on the display, repeatedly moving 
across the first line then the second.                   
  
Possible causeRemedy
The main board is not 
properly seated in the 
printer.Turn the printer off, then reseat the main board 
and turn the printer back on again.
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