HP Color LaserJet CM4730 Multifunction Printer series - Manual (Page 301)

Unexpected image
Defect description
The copy does not look like the original document.
Possible causes
There is media on the flatbed glass from a previous copy job.
Troubleshooting and suggestions
Remove any media from the flatbed glass.
Calibrate the MFP
The MFP automatically calibrates and cleans at various times to maintain the highest level of print
quality. The user might also request the MFP to calibrate via the MFP’s control panel, using Quick
Calibration or Full Calibration located in the Print Quality > Calibration/Cleaning menu. Quick
Calibration is used for D-Half color tone calibration. If color density or tone seems wrong, Quick
Calibration can be run. Full Calibration includes the Quick Calibrate routines and adds Drum Phase
Calibration, Color Plane Registration (CPR), and copy parameter calibration routines. If color layers
(black, magenta, cyan, and yellow) on the printed page seem to be shifted from one another, Full
Calibration should be run.
The HP Color LaserJet CM4730 MFP incorporates a new feature to skip calibration when appropriate,
thereby making the MFP available more quickly. For example, if the MFP is powered off and on quickly
(within 20 seconds), calibration is not needed and will be skipped. In this case, the MFP will reach the
ready state approximately one minute sooner.
While the MFP is calibrating and cleaning, the MFP will pause printing for the amount of time it takes to
complete the calibration or cleaning. For most calibrations and cleaning, the MFP will not interrupt a
print job, but will wait for the job to complete before calibrating or cleaning.
1. Scroll to and touch Administration .
2. Scroll to and touch Troubleshooting .
3. Touch Quick Calibration , or touch Full Calibration .
4. Touch Calibrate .
Repetitive defect ruler
If defects repeat at regular intervals on the page, use this ruler to identify the cause of the defect. Place
the top of the ruler at the first defect. The marking that is beside the next occurrence of the defect
indicates which component needs to be replaced.
ENWW Correct print quality and copy quality problems 285