The issue ran like this: I noticed one day that all of my prints were showing a sudden and alarming color shift. Blue skies looked more like pink. After a lot of experimentation, I was able to determine that the printer would produce reasonable colors if I told the printer that the paper was Plain Paper. Any other paper-type setting produced the strange color offsets. So I suddenly could not print using the correct settings for glossy, matte, photo-paper-pro, or photo-paper-plus glossy.
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Points 6 I disassembled and reassembled my i case at the beginning of February. When I did that, I discovered the cause of my non-printing cyan: the pipe to the CMY priming pad had popped off. In hindsight, I could have diagnosed that this was the problem from the slight popping sound when that group was cleaned. I took the opportunity to wash all the sponges and clean up the printer.
Disassembly of the i is tedious, not hard. I could not find a disassembly guide for the i However, Canon makes many of their printers alike so that the tricks and parts they use in one printer are the same as those in another. As you lift the cover, be very careful about the attached cables.
At the same time, I also got the i service manual. There is are amazingly useful tables in Part 2: 3. Hold on to you hat. Depending upon the settings, the i does uindirectional or bidirectional printing, uses 1, 2, 3, 4, 6, 7 or 8 colors, at resolutons of x to x in 1, 2, 3, 4, or 8 passes, borderless or with border! Boy did that single table explain a lot of mysteries. The table is fantastic. Or that printing on Matte Photo Paper high quality you are using only 7 colors no Green?
Plain paper standard mode is only using 4 colors. Of course the other advantage to the Service Manual is that it tells you how to print out the service mode diagnostic prints and dump the eeproms it appears to me that your printer has one eeprom and your print head has its own eeprom with its own serial number.
My work with the i convinced me that the printer is pretty simple to maintain think VW bug and that it is likely to remain a CIS cult machine for a long time. The printhead in the i is shared with the Pro and other Canon printers so it is apt to be available for many more years.
i9900 disassemble of outer case
Canon i9900 Issue and eventual easy fix