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Any error starting with U4 is usually the fuser. For the 4500 the part# is 604K28532, for the 4510 the part number is 604K37338 (both of these part#s are for the 110V version US & Canada). Replacing this is simple, no tools required. After replacing it you should also reset the fuser life counter. Here is a video that shows you how to do both of these steps. (iteminc.com has these in stock and ships same day)
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Try to hard reset your printer. To do this, unplug the cord at the rear
of the printer while still powered on. Then remove it the plug from the
socket. Let it sit for a few minutes. Then, plug the power cord and then
reattach the cord at the back. The printer should power on itself, if
not just power it on manually by pressing the power button.
Doing the hard reset should clear off any error messages from your printer's memory.
For the 4500, the fuser part number is 604K28532, iteminc.com has them in stock for $205, or refurbished using brand new rollers for for $185. here is a video that shows you how to replace it. Very easy with no tools required.
From the Xerox Phaser 4500 Service Manual (here), the main problems could be one of:
Warm-up failure - Fuser warm-up not complete within 110 seconds after
starting.
Cool-down error - Cool-down process not complete within 200 seconds.
Low trouble temperature - The fuser temperature drops to the low trouble
temperature (approximately current control temperature, minus
approximately 25°C).
High trouble temperature - The fuser temperature rises to the high trouble
temperature (approximately current control temperature, plus
approximately 35°C).
STS circuit open
STS failure - The heat rod remains on for at least 10 seconds after warm-
up has completed
It could be that your fuser needs to be replaced, but as you can see that code relates to a couple of problems, so even replacing the Fuser might not fix the problem.
If it doesn't even do the warm up checks it is likely to be the fuser because the other components such as STS failure and cooldown won't have had a chance to run..
1. Check for paper on the fuser. Y remove paper N proceed to step 2 2. Check the installation of the fuser assembly, make sure it is securely installed. Y reinstall fuser N proceed to step 3 3. Remove the fuser. Check the conductivity of the contact points of the thermostat, are the contact points connected N replace the fuser
The fuser is not warming up.
On that machine under the web there is a thermal fuse on a white plastic mount, it has one screw through it.
It is most likely blown. Possibly caused by a jammed paper in the fuser.
That fusable link needs to be replaced.
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