Color Laserjet M477 59.f0

[Pafasa]

Re: Color Laserjet M477 59.f0

Curious if the imaging unit/toners in the machine when it was making the random bands were OEM or Rebuilt?

We see problems with the drums arcing to the transfer belt quite often when customers use rebuilt image units. Sometimes even the OEM ones will do this too. One drum will arc and you will get a band of color at the exact same time from each drum. Is this what you had happen? There are tiny holes in the OPC coating on the drum that cause the arc. Sometimes the holes are there right from the start, Sometimes, they develop after some wear has been put on them. My guess is tiny bubbles in the coating as it is applied to the drum during manufacturing.

Yes, cool how they have a belt with just a cleaning brush and somehow it works. I think the cleaning cycle pulls toner to the secondary transfer roller. These machines are frustrating sometimes, but there are worse models out there. I know I'm in the minority here, but I kinda like this engine. This one is quiet and makes quite a nice color print and duplex too. All in such a small footprint.

[BaconSteve]

[Pafasa]

Re: Color Laserjet M477 59.f0


I agree. Maybe it is just discharge to prepare for next image cycle.

[Tricky]

Re: Color Laserjet M477 59.f0

I know this is an old thread but I work on these machines a lot and I hate them.

As it turns out... there is no cleaner unit. WTF? 30 years in this business, have never even HEARD of a color machine without a cleaner unit on the transfer belt. Apparently the machine uses bias voltage to reclaim excess toner OR runs so effectively and efficiently that there is no excess toner to clean up? Huh?

This total lack of waste toner got me interested so I removed a used black cartridge, if you look at it there is a box-shaped section in front of the drum. I made a hole in this with a knife and there's a browny black powder in there ahh so thats where the waste toner is. It uses voltages to pull the excess toner back onto the drum and into this compartment when its doing the cleaning process, that's why the drum / dev rollers spring apart talk about reinventing the wheel.

Did I mention that feeling you get when the transfer belt levers above the power supply break when trying to raise them?

HP should have released this machine without any parts available so no one uses them for a service contract

[stiveng]

Re: Color Laserjet M477 59.f0

Zeldaman is absolutely correct. I'm attaching the pertinent files since this is problematic for A LOT of people and should not be contained to only certain people.

Google Drive: Sign-in

Hopefully this link works.

could you please tell me how to get the file.


thank you

[Tom]

Re: Color Laserjet M477 59.f0

I have to agree with everyone else, these machines are a pain to work on, and not very cost efficient either when it comes to parts. Fusers go out too quickly and cost too much. (I'll admit I've gotten spoiled to mid size machines that are easy peasy parts swappable). The only good thing about these machines is the ability to get super cheap toners on ebay for practically nothing, a set of 4 for about $40 bucks instead of the OEM for $400. The new M479's were made with a chip that can't be duplicated so that's not an option for them. I've noticed people selling these machines online for twice what they originally cost just because they are the ones that take the cheap toner. I could handle the fuser replacement if they weren't so expensive, but the ITB is even worse and replacing the doc feeder or anything in the optics section even worse. Definitely a disposable machine in my opinion. When they were being discontinued I bought every one I could find at all the area Office depots for $329 brand new, regular around $500. For that price I would just swap machines every time they broke down if I could still get them, just make the money off the cheap toners which you can sell for $200/set and still be half the price of the OEM.