HP Officejet 6500A Plus - Manual (Page 119)

Regular white streaks in the bars
If any of the color bars show regular white streaks, follow these steps:
White streaks The print quality bars have white streaks in them.
1. If the Print Quality Diagnostic report reads PHA TTOE = 0, align the printer. For
more information, see Align the printhead.
2. "If PHA TTOE is not 0," or aligning does not help, clean the printhead. For more
information, see Clean the printhead.
3. Print another Print Quality Diagnostic report. If the streaking is still there, but seems
better, try another cleaning. If the streaking gets worse, contact HP - the printhead
may need to be replaced.
Bar colors are not uniform
Print quality bars are not uniform The bars have lighter or darker portions in them.
If the color of any of the bars is not uniform, follow these steps:
1. If the printer was recently transported at a high altitude, try a printhead cleaning.
2. If the printer was not recently transported, try printing another Print Quality
Diagnostic report. This uses less ink than a printhead cleaning, but if it is not
effective, try a cleaning.
3. Retry the Print Quality Diagnostic report. If the colors seem to be improving,
continue cleaning. If the colors get worse, contact HP - the printhead may need to
be replaced.
Print quality troubleshooting 115