HP LaserJet 9040/9050 Service Manual - Page 256

Replace the DC controller PCA., Light print, dark print, or, Also see Bubbles on,

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Table 29. Image defects (continued) Problem Cause Solution Light print, dark print, or The toner density setting is incorrect. z From the configure device menu on the fade control panel, adjust the toner density setting (make sure EconoMode is off). The transfer charging roller is defective. z Replace the transfer charging roller. The media does not meet printer z specifications or is stored incorrectly. z z Print a few more pages to see if the problem corrects itself. Turn over the stack of media in the tray. Also try rotating the media 180°. If the media does not meet HP specifications, replace the media. Poor contact to the high-voltage power supply exists. z Make sure that the drum ground spring is connected correctly to the high-voltage power supply. z Clean the contacts if they are contaminated. If the problem persists after cleaning, or if parts are damaged or deformed, replace them. z Replace the high-voltage power supply, if necessary. The laser/scanner assembly is defective. z Replace the laser/scanner assembly. The DC controller PCA is defective. z Replace the DC controller PCA. The laser shutter is defective. Also see "Bubbles" on page 239. z Check the laser shutter for correct operation when installing the print cartridge. Loose toner Contamination in the printer exists. z Print a few more pages to see if the problem corrects itself. z Clean the inside of the printer or use the printer cleaning page. The print cartridge is defective. z Replace the print cartridge. The media might be too smooth. z Check the media type and quality. The fuser setting is incorrect for the media type. z From the paper-handling menu on the control panel, change the fuser mode setting or select another media type from the printer driver. The fuser is defective. z Maintenance might be due. Check this by printing a copy of the supplies status page. If maintenance is due, order and install the preventive maintenance kit. z Replace the fuser. The envelope levers are set incorrectly. z Make sure that the envelope levers are set to the specified media. Repeating defects A roller is contaminated or defective. z See the "Repeating defect ruler" on page 243. 240 Chapter 7 Troubleshooting

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240
Chapter 7 Troubleshooting
Light print, dark print, or
fade
Also see "Bubbles" on
page 239.
The toner density setting is incorrect.
From the configure device menu on the
control panel, adjust the toner density
setting (make sure EconoMode is off).
The transfer charging roller is
defective.
Replace the transfer charging roller.
The media does not meet printer
specifications or is stored incorrectly.
Print a few more pages to see if the
problem corrects itself.
Turn over the stack of media in the tray.
Also try rotating the media 180
°
.
If the media does not meet HP
specifications, replace the media.
Poor contact to the high-voltage
power supply exists.
Make sure that the drum ground spring is
connected correctly to the high-voltage
power supply.
Clean the contacts if they are
contaminated. If the problem persists after
cleaning, or if parts are damaged or
deformed, replace them.
Replace the high-voltage power supply, if
necessary.
The laser/scanner assembly is
defective.
Replace the laser/scanner assembly.
The DC controller PCA is defective.
Replace the DC controller PCA.
The laser shutter is defective.
Check the laser shutter for correct
operation when installing the print
cartridge.
Loose toner
Contamination in the printer exists.
Print a few more pages to see if the
problem corrects itself.
Clean the inside of the printer or use the
printer cleaning page.
The print cartridge is defective.
Replace the print cartridge.
The media might be too smooth.
Check the media type and quality.
The fuser setting is incorrect for the
media type.
From the paper-handling menu on the
control panel, change the fuser mode
setting or select another media type from
the printer driver.
The fuser is defective.
Maintenance might be due. Check this by
printing a copy of the supplies status
page. If maintenance is due, order and
install the preventive maintenance kit.
Replace the fuser.
The envelope levers are set
incorrectly.
Make sure that the envelope levers are set
to the specified media.
Repeating defects
A roller is contaminated or defective.
See the
"Repeating defect ruler" on page
243
.
Table 29.
Image defects (continued)
Problem
Cause
Solution