My Canon i850 just started to exhibit a printing problem of missing pixels, so I ran the nozzle check and it came up with some missing horiz. lines in the grid patterns. I did both a cleaning and a deep cleaning with no change. I then took the printing head and cleaned it by running under warm water until the water ran clear. This also produced no change in the nozzle check.
The missing horizontal lines that are missing always show up in the same position.
Thanks in advance
Mr. G
The missing horizontal lines that are missing always show up in the same position.

Thanks in advance

Mr. G