How-To: perform extended nozzle check w/ MX850? Interpret? Why? [n/t]

[l_d_allan]

no text

 

[ghwellsjr]

To perform an extended nozzle test on the MX700, MX850, and possibly other printers, do the following:

WARNING: Be very careful to follow these instructions precisely. If you get lost, don't keep pressing buttons as that may do things you don't want to do and permanently screw up your printer. Instead, just pull the power cord out of the printer, wait a few seconds and then plug it back in and power it up normally. The shut it down normally and repeat the process.

Start with the printer turned off and with paper in the rear feed source.

Hold down the Stop/Reset button and do not let go until told to so.

Hold down the Power button and do not let go until told to so.

Let go of the Stop/Reset button while continuing to hold down the Power button.

Press and release the Stop/Reset button twice while continuing to hold down the Power button.

Let go of the Power button.

Wait until the display says:

Service Mode
Idle

Press and release the Stop/Reset button once.

Press and release the Power button once.

Wait for the Service Print to finish printing.

Press the Power button once.

Wait for the printer to turn off completely.


The Service Print will contain the extended nozzle check but in a different form than what earlier Canon models printed. Instead of grid patterns where each horizontal segment was produced by a different nozzle, this nozzle check pattern is similar except there are no vertical lines. For a perfect nozzle check, it looks very similar to the dye ink patterns for the normal nozzle check--a solid block of color. However, if there is a clogged nozzle, it will appear in this extended nozzle check as a white horizontal line, 1/8th of the width of the pattern.

For the MX700, the block for the yellow nozzles is done with just yellow ink which is very difficult to see but for the MX850, cyan is added making the block green. This makes it easy to tell if there is a clogged yellow nozzle because instead of seeing a white horizontal line segment, you will see a cyan horizontal line segment.

 

[l_d_allan]

Thanks! Does anyone have the equivalent for the Pro 9000-2?