MX850 - error code 5100 = can you help please.

Hi You can Try

Error Code 5100
Solution 1:
Clean the timing strip.

Solution 2:
The purge cap (the white sliding mechanism that the print head parks to when it's not in use) may be not lubricated well enough .

Lubricate the sliders with some white grease (don't get it on the small wipers or the black caps); this repair probably require to remove the right panel off of the printer to gain access to the purge mechanism.

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I can verify that cleaning the timing strip works.

I was getting a 5100 half-way through a printed sheet. I used isopropyl alcohol from the drug store (70%), and cleaned both sides of the timing strip (**** strip) with a Q-tip. Made sure to clean *both* side of the st

A symptom of a dirty timing strip is that there will be vertical gaps visible in test output when you print the nozzle checksheet, and this gap appears in all of the colors. The gap will be slightly off in position from color to color, but this is because the nozzles for each color are in slightly different positions relative to each other.

If you simply look at where the gap is in the black output on the nozzle checksheet - that is where the dirt is located on the timing strip.

Sure enough, when I shined a light in there - I could actually see the smudge on the timing strip.

Thanks to this thread for giving me the clues I needed to avoid an expensive repair job!