How to repair a code 72 on a Xerox 6200 color laser printer

The error message "engine firmware" code 72 is showing up on the display. I've turned the printer off/on and error message still appears.

you printing the envelope set printer property for envelope

oh i tell you how i fixed it for free, but you i have to pay you to get an answer. okay this is how i fized it............

if you turn the machine off and turn it back on:
A} error code is gone, problem solved, system just needed to refresh
B} error code returns, pot luck, the engine control board inside of the printer needs to be replaced and coming from me who is a professional and has had to do it twice, please don't call me to do it, it's a pain in the tookus.

1 of 2 things.
You need to clean or replace the fan.
You have to remove the back, right side and top cover to access that fan.It is near the back just behind the fuser module.
It could also be the low voltage power supply fan. Most likely the fuser fan.
Once you remove the fan, there is a label on it, remove the label, There is a rubber plug behind the label, remove the plug and drip some lubricant into the fan. Reassembly and it should be ok.
I would recommend replacing the defective fan though.
Here is a very reliable part source.
https://www.partsdrop.com/store/

If you call ask for Britt and specify the model number and that you need a fuser fan and probably order a Power supply fan, Neither are very expensive.
Have both on hand to be 100 percent sure the problem is resolved, But its a 90 percent fuser fan failure code. It operated in a heated area and can dry out faster.

That normally indicated a heating issue with the print head. Could be the printhead itself or an issue with the electronics module providing the source voltage for that heater

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It is a print head tilt error.
Most likely ink is in the stainless steel pivot block at the bottom of the print head.
Also the printer could have been unplugged and the cleaning blade is stuck to the print head.
Or a cable is binding the print head movement.

Not a problem, but turning it off causes the machine to do a setup, which then purges the ink supply and is very wastful.