HP 2425 - Manual (Page 138)

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2 Check that there is enough toner in the printer.
If the TONER LOW message appears in the message window,
remove the toner cartridge and gently rock it from side to side to
redistribute the toner. Then reinsert the cartridge and try printing
again.
3 If the message remains on, replace the toner cartridge.
4 Place a service call to your QMS vendor.
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1 Check that the media does not exceed the media limit mark.
Make sure that the stack does not exceed the paper limit mark on
the media cassette.
2 Check that the paper stack is correctly aligned.
Make sure that the stack is correctly aligned in the media cas-
sette or in the multipurpose tray.
3 Check that the correct paper type is used.
See appendix B, “Technical Specifications,” in the Reference, for
media specifications.
4 Check the printer for residual jammed media.
5 Remove any jammed media remaining inside the printer by
checking the locations in “Media Path” on page 6-17.
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If you have set the printer from the configuration menu to print at 600
dpi resolution but the printer continues printing 300 dpi, you may need
additional memory allocated to the frame buffer. See the “Memory”
section in chapter 5, “Additional Technical Information,” in your
Refer-
ence guide for additional information on memory configuration.