Question about Tektronix Phaser 780P Laser Printer

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Crackling noise coming from fuser area while rotating

Hi -  RE: Phaser 780: 22,000 pages - very clean Fuser: 70% remaining.
I'm inquiring because the fuser assembly items seemed to pass inspection, and want to know that if the machine is printing just fine, can I afford to ignore this sound or do I try to replace the correct part because I could be doing expensive damage I don't know about.

I inspected the fuser, shiny gray roller and red rubber rollers and did not see any defects/ scratches or gouges or toner buildup. The red roller did seem to have a slight bit of oil present at either end. When the printer is warming up, and while printing (prints fine by the way), only while parts are rotating in the fuser area, or the fuser is being heated, I hear a sort of snap-crackling noise akin to hot oil....
May be important to note that when I had the fuser out to inspect the other 2 rollers and turned them with the gear on the left, I thought I could hear the same crackling noise intermittently, so it may be one of the other two rollers and not the fuser.

I do have the luxury of a newly acquired donor printer from which I could swap parts, as well as a new fuser on hand to see if I could correct the problem. 
Many thanks for any advice before I spend Christmas frankensteining the donor printer.

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SOURCE: Tektronix 740 fuser

found solution, was the clutch on the accumulator shaft

Posted on Feb 06, 2008

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SOURCE: White stripes evident each time the printer is started up from cold

Those solid ink machines are designed to be left on 24 hours a day, 7 days a week. (it uses about $20 in ink to turn on each time)

When turned off the printhead nozzles can get clogged up with dry ink, which causes white stripes. Running the eliminate light stripes routine purges the printhead (using another $10 or $12 in ink). When it becomes a continuous problem the printhead needs to be replaced....very expensive and time to get a new printer !

Posted on Jan 22, 2009

  • 42 Answers

SOURCE: I have a Tektronic Color

the paper jamming problem is generic to most printer models of this capability. one way to circumvent this is to use a multimedia-tray while printing.

the reason is probably the two springs that hold down a silver metal pressure roller in the feeding unit. The tension is uneven due to old springs and the paper pulls crooked. If you follow the paper path in the fedder mechanism, you will see the roller I am referring to. The springs are at either end of this bar.
If you are good mechanically, you can replace the springs yourself, although they are a ***** to get back on (some disassembly required).
try this for details on doing it.

Posted on Jul 23, 2009

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SOURCE: My phaser 740 has print

Recalibrate the colors. Flaking is sometimes caused by more ink/toner than can be fused to the media. There's a limit for the total amount of ink/toner. Yours may be set too high.
You'll need a copy of the Printer's User's Guide (also Downloadable from

Controlling Color Density

When colors look faded, adjust the toner color density to extend the life of the components.

Print and use the Color Reference Page 1 In the printer's front panel, scroll to Calibrate Colors,

press Menu and print the Color Reference Page. 2 Compare the Color Reference Page to the Color Density

Samples on page 39. Make a note of the value (-10 to +10) for each color that most closely matches the samples.

3 Adjust the density for each color: Enter the value noted in Step 2 in the Calibrate Colors menu, under Adjust Each Color.

? Decrease color density: Press . ? Increase color density: Press --->.

4 Reprint the Color Reference Page; check your adjustments

Posted on Sep 25, 2011

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How to clean phaser 7750

Included general maintenance video and how to clear smears from the paper.

Solution: Remove Print Smears / Printing Fuser Cleaning Pages
7750 Support Knowledge Base Remove Print Smears Fuser Cleaning...

With Troublshooting highlighted on the printer display perform the following steps:
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From the Xerox Phaser 4500 Service Manual (here), the main problems could be one of:

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