That error is an ATC failure. It can be caused by a bad drum or MCU Board. You can first try clear the value of NVM [752-059] (ATC Fail) or NVM [752-060] (ATC Fail Continuous Count) to '0'. Enter Diagnostics, Press and hold the [0] key on the Control Panel for 4 seconds or longer and then press
the [Start] button while keeping your finger on the [0] key.
Password is 6789. And go to NVM Initialize.
SOURCE: xerox 214 copier - U 4 code....what does it mean?
A U-4 code mean the machine did not reach to temperature.
On this machine check to see if the side door is completely closed.
This door also has some to close with a circuit board on the side.
Check to see on the side door if the small flat metal springs are aligned and not bent, with the power cord disconnected. If these metal springs are out of place a short can occur. Be very careful in this area. If you are not sure what you are doing do not try to service this area of the machine.
One other thing, if the machine has been stored in a very cold place, brining the machine to a room temperature will take about 2 hours for the machine's circuit boards just to warm up.
Usually on this problem, it may be a combination of problems. It means a new fuser assembly, or main circuit board. Not easy to get to, it is in the middle of the machine. Everything has to be taken apart without breaking other components.
Be very extra careful if you are doing this work yourself. This is why you should place a service call for a Xerox service rep to do the repair.
SOURCE: XEROX COPIER XC865 HAS AN H4 ERROR CODE HOW TO
H4Fuser temperature too low. Must be reset in diagnostics
SOURCE: Xerox DocuColor 3535 Copier Problem
116-325 RAP An error occurred in ESS fan rotation:---------Try reset procedure:--
to correct your issue:
Simultaneously press and hold the 1, the Stop, and the Power Save buttons on the Control Panel.
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If the problem persists try:
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Hold the 6, the Stop, and the Power Save buttons.If still it comes again,---------
Hold the 4, the Stop, and the Power Save buttons .If still it comes again ,-------
Hold the 3, the Stop, and the Power Save buttons .If still it comes again then there is internal problem with cooling fan .The ESS fan module has to be replaced.The part number for ESS fan module is
127K32920.To order this part you can order it from online website.click this link directly to order the parts:---
http://www.iteminc.com/parts_docucolor_1632_2240.htm
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this will help.Thanks.Helpmech.
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