OKI C7350DTN User Manual

C7350/7550 User’s Guide: Troubleshooting   •  521
Paper Jams
Clearing 
Check additional paper trays
If any optional paper tray(s) are installed:
6.Pull them out.  Check that no paper is jammed along the 
various parts of the exit path.
7.Close the top cover.
 close top cover.eps 
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C7350/7550 User’s Guide: Troubleshooting   •  522
Paper Jams
Examples of Paper Jams
Paper jams are frequent
More than one sheet feeds at a time
Paper curls
Paper feeds at an angle
  
Possible cause Remedy
The printer is not 
horizontal.Place the printer on a stable, level surface.
The paper is too thin.Use the correct type of paper. See 
Specifications.
The paper is moist or 
affected by static.Store paper within specified temperature and 
humidity levels.
The paper is creased or 
wrinkled.Remove the...

C7350/7550 User’s Guide: Troubleshooting   •  523
Paper Jams
Printer does not print after jam is cleared
  
Possible cause Remedy
The top cover was 
closed before all 
paper jams were 
cleared.Removing a paper jam is not enough.
The top cover cannot be closed until all of the 
paper jams are cleared.
Gently open and close the top cover.
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C7350/7550 User’s Guide: Troubleshooting   •  524
Print Quality Problems
Stripes:  White
The stripes appear in the same direction as the paper was 
printed (moved through the printer).
   
Stripes:  Black
The stripes appear in the same direction as the paper was 
printed (moved through the printer).
  
Possible causeRemedy
LED head is dirty. Clean LED head with lens cleaner or soft tissue.    
See “Cleaning the LED heads” on page 502.
Toner is low.Change toner cartridge.
See “Changing the Toner...

C7350/7550 User’s Guide: Troubleshooting   •  525
Print Quality Problems
Blurred letter edges
  
Possible causeRemedy
LED is dirty. Clean LED with lens cleaner or soft tissue.
See “Cleaning the LED heads” on page 502.
Cannot print desired 
color because toner 
is low.Replace toner cartridge.
See “Changing the Toner Cartridge” on page 484.
Black formation 
method does not 
match application.Open the printer driver and set black formation 
to CMYK.
See “Printing Black” on page 31.
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C7350/7550 User’s Guide: Troubleshooting   •  526
Print Quality Problems
Faded Output
Streaks
 
Faded Output
Random Patches
 
Faded Output
Print
  
Possible causeRemedy
LED head is dirty. Clean LED head with lens cleaner or soft tissue.
See “Cleaning the LED heads” on page 502.
Toner is low.Change toner cartridge.
See “Changing the Toner Cartridge” on page 484.
Paper is unsuitable 
for printer.Use recommended paper.
See Paper (Media)“Recommendations” on page 62.
Possible causeRemedy
The paper is moist....

C7350/7550 User’s Guide: Troubleshooting   •  527
Print Quality Problems
Shading on unprinted sections
  
Toner rubs off the output
 
Output is garbled or incorrect
 
Possible causeRemedy
Paper has been 
affected by static 
electricity.Store paper within specified temperature and 
humidity levels.
See Paper (Media)“Recommendations” on 
page 62.
Paper is too thick.Use recommended paper.
See Paper (Media)“Recommendations” on 
page 62.
Toner is low. Change toner cartridge.
See “Changing the Toner Cartridge”...

C7350/7550 User’s Guide: Troubleshooting   •  528
Parallel Interface Problems
Parallel Transmisssion Mode
The parallel port supports IEEE-1284 and ECP mode. If your 
computers parallel port is not compatible with one of these modes, 
the printer may not print at all or it may print corrupted data.       
To correct for this, enter the printers Parallel Menu and change the 
ECP setting to Disable. 
  control panel - language setup.eps 
1.Press MENU until PARALLEL MENU displays
1.Press SELECT.
2.Press ITEM...

C7350/7550 User’s Guide: Troubleshooting   •  529
Parallel Interface Problems
Cannot configure for parallel connection
Windows only
 
Possible cause Remedy
The computer does 
not support 
bi-directional 
parallel interface. There is no solution for this problem. 
You must use a computer that supports a 
bi-directional parallel interface.
Parallel cable does 
not meet 
specifications.Use a bi-directional parallel cable that meets the 
IEEE 1284–1994 specifications.
The interface is 
disabled.Check that...

C7350/7550 User’s Guide: Troubleshooting   •  530
Parallel Interface Problems
Output is garbled or incorrect.
Windows only
 
Possible cause Remedy
Possible mismatch on 
parallel connection 
between computer 
and printer.Change parallel transmission mode (see Parallel 
Transmission Mode above).
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