Konica Minolta bizhub 20p User Manual

Troubleshooting
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7
Clear the jammed paper as follows. 
aPress the cover release button and then open the front cover.
bSlowly take out the drum unit and toner cartridge assembly. The jammed paper will be pulled out with 
the drum unit and toner cartridge assembly.
IMPORTANT
 
We recommend that you put the drum unit and toner cartridge assembly on a piece of disposable paper or 
cloth in case you accidentally spill or scatter toner.
 To prevent damage to the printer caused by static electricity, DO NOT...

Troubleshooting
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cOpen the back cover.
dPull the tabs at the left and right hand sides toward you to open the fuser cover (1).
eUsing both hands, gently pull the jammed paper out of the fuser unit.
CAUTION 
After you have just used the printer, some internal parts of the printer will be extremely hot. Wait for the 
printer to cool down before you touch the internal parts of the printer.
 
1
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Troubleshooting
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fPut the drum unit and toner cartridge assembly back in the printer (press firmly).
gFully close the front and back covers.
hPull the duplex tray completely out of the printer.
iPull the jammed paper out of the printer or the duplex tray.
j Put the duplex tray back in the printer.
kMake sure that the Back Cover and Paper LED are off and then, the Status LED lights green.
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Troubleshooting
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Improving the print quality7
If you have a print quality problem, print a test page first (see Print a test page on page 80). If the printout 
looks good, the problem is probably not the printer. Check the interface cable or try the printer on another 
computer.
This section gives information on the following topics.
Examples of poor print 
qualityRecommendation
Faint„Check the printer’s environment. Conditions such as humidity, high 
temperatures, and so on, may cause this print...

Troubleshooting
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Hollow print„Make sure that you use paper that meets our specifications. See About paper on 
page 6.
„Choose Thick Paper mode in the printer driver, or use thinner paper than what 
you are now using.
„Check the printer’s environment. Conditions such as high humidity can cause 
hollow print. See Positioning the printer on page 5.
„The drum unit may be damaged. Put in a new drum unit. See Replacing the drum 
unit on page 97.
All black„Clean the primary corona wire inside the drum unit...

Troubleshooting
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Black toner marks across the 
page„The drum unit may be damaged. Put in a new drum unit. See Replacing the drum 
unit on page 97.
„The toner cartridge may be damaged. Put in a new toner cartridge. See 
Replacing the toner cartridge on page 90.
„Make sure that you use paper that meets our specifications. See About paper on 
page 6.
„If you use label sheets for laser printers, the glue from the sheets may sometimes 
stick to the OPC drum surface. Clean the drum unit.
„Do not use paper...

Troubleshooting
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Curled or wavy„Check the paper type and quality. High temperatures and high humidity will cause 
paper to curl. See About paper on page 6.
„If you do not use the printer often, the paper may have been in the paper tray too 
long. Turn over the stack of paper in the paper tray. Also, fan the paper stack and 
then rotate the paper 180° in the paper tray.
Wrinkles or creases„Make sure that the paper is loaded properly. See Printing on plain paper, bond 
paper or transparencies from...

Troubleshooting
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Poor Fixing„Open the back cover and make sure that the two blue levers on the left and right 
hand sides are in the up position.
„Choose Improve Toner Fixing mode in the printer driver. See Improve Print 
Output in Advanced tab on page 38 (For Windows
® printer driver), Advanced 
options on page 49 (For BR-Script printer driver for Windows
®) or Print Settings 
on page 56 (For Macintosh). If this selection does not provide enough 
improvement, select Thicker Paper in Media Type...

Troubleshooting
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Curled„Lift up the Face-down Output Tray Support Flap 2 (Support Flap 2) (1).
„Choose Reduce Paper Curl mode in the printer driver. See Improve Print 
Output in Advanced tab on page 38 (For Windows
® printer driver), Advanced 
options on page 49 (For BR-Script printer driver for Windows
®) or Print Settings 
on page 56 (For Macintosh).
„Turn the paper over in the paper tray, and print again. (Excluding Letterhead 
paper) If the problem remains, switch the Anti-Curl Lever as...

Troubleshooting
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Solving print problems7
ProblemRecommendation
The printer prints unexpectedly 
or it prints garbage data.„Make sure that the printer cable is not too long. We recommend that you use a 
parallel or USB cable that is no longer than 2 meters (6.5 feet).
„Make sure that the printer cable is not damaged or broken.
„If you are using an interface-switching device, remove it. Connect your computer 
directly to your printer, and then try again.
„Make sure that you have chosen the correct...