SOURCE: xerox Phaser 7750 code 35
Somehow you jarred the fuser. Turn the machine off and reseat the fuser. Open the left side door, there will be 2 thumb screws.
Remove and reseat the fuser, if that doesnt work you have to replace the fuser.
SOURCE: Xerox Phaser 8400 getting error -- Service Needed 37,002.47:72864
The technical error message means:
The Printhead Left jetstack heater is not drawing the expected power from the power supply.
Possible solutions:
1) Make sure the AC plug is plugged into the wall and not a UPS or surge protector. Other things such as another printer, coffee maker or other electrical devices on the same circuit could cause a sag in AC demand from the Phaser, causing it to fail it's PEST (Print Engine Self Test).
2) Verify that the wall outlet's circuit is capable of delivering the correct amount of current to the Phaser, if it does, check how many other electrical devices (aka a desklamp, radio, etc.) are on the circuit.
3) If it's out of warranty, reseat the cables from the Printhead to the Electronics Module. If it's in warranty, place a service call on the unit.
SOURCE: I keep getting Error code
That is the fuser fan. It is either running slow or stalled.
You have to remove the rear and top cover to access it. It is located on the upper right back side of the machine looking from the rear.
You can remove the fan, peel off the silver label then remove the small rubber cap in the middle. Behind that rubber cap is the fan bearing, It is dirty and needs to be cleaned.
You can flush it with alcohol then add a highly refined oil to that bearing, Replace the rubber cap and then clean the outside with alcohol, then put a small piece of tape over the rubber cap to keep it in place. Most of the time. I would say 75 % of the time that will fix the problem. If it doesn't fix it in the long term you wol have to replace the fan. Don't call Xerox directly, Go onto google and look up a business called " the parts drop". Call them and ask for Britt or Joe> I dont work for them, but have purchased parts from them for years. They are reliable, fairly priced and honest. Great people to do business with.
SOURCE: Xerox Phaser 7750 Imaging Unit Percentage Question?
If you have not had any success after turning the machine off you might have gotten ripped off. where they new? or refurb.. I always buy my xerox consumables from item inc. I have thier information on my ad page. good luck.
Fixed! 
Did not fix.
Remove the Phaser 7700 Accumulator Belt and install a Phaser 7750 Accumulator Belt.
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