bradjo
07-04-2011, 03:31 PM
I have a very low use (< 14,000 pages), HP 4550 Color Laserjet. It suddenly started fading all colors. You can see images of the problem:
http://bradjo.imgur.com/
I have tried:
1. Swapping all consumables (I use ONLY HP OEM consumables),
2. Cleaning laser mirrors & entire printer
I've taken the printer apart and completely cleaned it and the laser mirrors (the mirrors were pristine), and on the power supply there are 2 sets of paired ferrite beads, FB3 and FB4 they both appear to have blackened the circuit board. See the image here:
http://i.imgur.com/Tofkwl.jpg (http://imgur.com/Tofkw)
The fuse on the 110 power supply board is good which makes me think it's not the power supply. What else could possibly be causing this?
The high voltage power supply boards A & B are both pristine. Although I have not tested them and do not know how to test them, help?
Thank you for any help you can offer,
Jo
http://bradjo.imgur.com/
I have tried:
1. Swapping all consumables (I use ONLY HP OEM consumables),
2. Cleaning laser mirrors & entire printer
I've taken the printer apart and completely cleaned it and the laser mirrors (the mirrors were pristine), and on the power supply there are 2 sets of paired ferrite beads, FB3 and FB4 they both appear to have blackened the circuit board. See the image here:
http://i.imgur.com/Tofkwl.jpg (http://imgur.com/Tofkw)
The fuse on the 110 power supply board is good which makes me think it's not the power supply. What else could possibly be causing this?
The high voltage power supply boards A & B are both pristine. Although I have not tested them and do not know how to test them, help?
Thank you for any help you can offer,
Jo