Mark 3

  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.
  • warning: Creating default object from empty value in /home/jeffreygough/drupal4/sites/warrantyvoidifremoved.com/modules/spam/spam.module on line 488.

I decided to buy a colour laser printer to experiment with, as I suspected that I could print blacker with one. They print four times (CMYK) onto a transfer belt, then transfer the image from the belt to the paper (circuit board). So potentially I can have four layers of toner deposited without any alignment problems.

Here it is, an HP 4550. I chose it because it matches my new fuser, and I was impressed with the fuser's excellent build quality. It was sold as broken on ebay because "one day it didn't work on the network", so I got it for a mere £35 - no postage either as it was in Eastleigh. The cup of tea is for scale; as you can see, it's about the size of a medium garden shed. I swapped the network card with the one I've been using so far (mostly because I couldn't be bothered to change the settings, I suspect the 4550's card is fine too). As you can see, the printer worked perfectly, generating a lovely, colour CUPS test page.

So I started taking it to bits. Here it is without an outer shell. The various door sensor have been disabled. There are 3 drawers on the front - the top is for the drum, the middle (the open one) is for the Tray 1/manual feed and the transfer belt. The bottom is Tray 2. 

I started stripping down the middle drawer as it offered the straightest path into the printer. I removed the registration unit so the first thing the board gets to is the image transfer belt and transfer roller. Here's the stripped down drawer, with just the leading edge sensor and pcb floating in space.


 

The registration unit contains an optical sensor to determine whether the media is acetate or paper. Without the sensor the printer wouldn't power up, so I replaced it with a switch. It wasn't as easy as hoped - unlike the other optical sensors I'd fooled, I couln't just give it 5V or 0V, it took 5 or 3.5, so I switched in a 4.7k resistor to make a divider with the existing 2.7k pull-up.

I wanted to run it without the fuser unit occupying the space behind the imaging rollers, so I extended the wires between the printer and the fuser. Unfortunately this wasn't enough, the printer powered up with "50.4 fuser error" - the printer actually checks that the fuser drums are rotating! There's a small cam in the fuser that is geared to the rollers, and pushes on a plastic slider that engages a photointerruptor. As the cam rotates the printer gets a square wave from the photointerruptor. This was obviously quite a pain, as the fuser wouldn't be rotating as it sat on the table next to the printer - I had to add a simple oscillator circuit to fool the printer. 

I took a video of the cam as the fuser rotated so I could measure the frequency without tapping into the sensor output. I measured about 0.53Hz over about 30 rotations. So I used a 4047 astable circuit on a bit of stripboard, connected to the photointerruptor cable. The cable has three wires - ground, power for the led, and an input that connects to the collector of the photodiode and is pulled up in the printer. So I could power the 4047 straight from the led power (fortunately the 4047 uses far less power than a 555!), and connect  the output directly to the collector input. I hoped that I could leave it oscillating all the time without pissing off the printer, assuming that the printer wouldn't check the fuser was rotating whenit wasn't being driven! Here's the board, and the board and fuser working outside the printer.


Here's the board and fuser connected to the printer.  My assumption was valid - it worked and the printer powered up error-free. I removed the paper transport belts that take the paper to the fuser, leaving tonnes of space inside the printer.

I started printing onto some board. It's early days yet, but I think it is more promising than the black and white HP 2200. Large areas of black are not very black, but they are very uniform. None of the random voids / pinholes that I had with the 2200. Now I need to find out how to get it to print CMYK black rather than just K (a patch of each colour on top of each other). As far as I can tell no Linux apps will generate the right output - the gimp just "flattens" four CMYK layers to a single black, and writes just one black patch into the postscript. I need to write some postscript by hand to really find out what's happening.

Submitted by jeff on Thu, 03/22/2007 - 16:18. categories [ ]

PCL/PJL

It seems that your printer can be directly controlled with HP's PCL or PJL language. Not sure which version though.

Some guy touches on it a little here:
http://www.irongeek.com/i.php?page=security/networkprinterhacking#Intro%...
but the page is largely about hacking the printer.

Also here
http://www.phenoelit.de/hp/download.html
is some C++ source to access and change all the printer's variables, including things like whether the buttons are enabled or not.

This page:
http://www.maths.usyd.edu.au/u/psz/ps.html#PJLref
Has some links to HP resources. I was particularly interested in the PCL 5 Color reference manual. It describes, for example, how to program the printer with your own colour palettes, allowing you to specify how much of each component you want in it. However, it doesn't seem to allow you to specify the K component, which is a pain. It also may not be the correct version of the protocol for your printer.

Warranty Void if Removed | Collected technological projects

S?ould you hire a Private Investigator orr a Ski? Tracer. The information provided onn a credit report will total a score. Credit cards, personal loans, edu?ational loans and various r?possession loans come unmder unsecu?ed debt. Feel free t? surf to my web blog ... ProRepo Repossession Software

Warranty Void if Removed | Collected technological projects

Press tthe ideal mouse button 8 ball pool hcks possess. ?? site; 8 ball pool guide

Warranty Void if Removed | Collected technological projects

It might sound too good to be accurate, but you truly can employ a professional writer at a extremely reasonable rate to total your homework. Also visit my website; homework help

Warranty Void if Removed | Collected technological projects

Its not my first time to pay a visit this web page, i am browsing this website dailly and obtain pleasant information from here daily. Feel free to surf to my web blog; Taruhan Judi

Warranty Void if Removed | Collected technological projects

Mr Morrison made a decision to utilize the game - named the newest Minecraft - after examining a worrying guide about any of it online, Sunlight claimed.|and it enjoyed since Around the other hand, there are a few games that havenot been updated in years and use the concept format that is previous.|played with it since Thus, the design could possibly be rebuilt into whatever, ROBLOX is about imagination you imagine. Also visit my web-site :: generateur roblox robux

Warranty Void if Removed | Collected technological projects

Hi there would you mind stating which blog platform you're working with? I'm planning to start my own blog soon but I'm having a hard time choosing between BlogEngine/Wordpress/B2evolution and Drupal. The reason I ask is because your design seems different then most blogs and I'm looking for something completely unique. P.S Apologies for being off-topic but I had to ask! Also visit my page: daftar judi casino online

Amazing

Brilliant!

good

Innovation has nothing to do with how many R amp&; D dollars you have. When Apple came up with the Mac, IBM was spending at least 100 times more on R & D. It's not about money. It's about the people you have, how you're led, and how much you get it. papers for sale

good

For you to sleep well at night, the aesthetic, the quality, has to be carried all the way through. top rated resume writing services

good

It took us three years to build the NeXT computer. If we'd given customers what they said they wanted, we'd have built a computer they'd have been happy with a year after we spoke to them - not something they'd want now. curriculum vitae writing

Thank you for your usual

Thank you for your usual excellent effort. Dompet wanita murah bagus Lulur Susu Domba Asli free vpn

Warranty Void if Removed | Collected technological projects

Hey there! This is my first comment here so I just wanted to give a quick shout out and say I genuinely enjoy reading through your blog posts. Can you recommend any other blogs/websites/forums that cover the same subjects? Thanks! My homepage Agen Casino Indonesia

Warranty Void if Removed | Collected technological projects

An impressive share! I've just forwarded this onto a friend who has been doing a little homework on this. And he in fact ordered me lunch due to the fact that I stumbled upon it for him... lol. So allow me to reword this.... Thanks for the meal!! But yeah, thanks for spending some time to discuss this subject here on your web site. Also visit my web site ... David Rohl

Warranty Void if Removed | Collected technological projects

I was suggested this blog by means of my cousin. I'm not positive whether or not this publish is written by him as nobody else know such exact about my problem. You're amazing! Thanks! My website; Agen Bandar Bola Terpercaya

Warranty Void if Removed | Collected technological projects

Howdy just wanted to give you a quick heads up and let you know a few of the pictures aren't loading properly. I'm not sure why but I think its a linking issue. I've tried it in two different web browsers and both show the same outcome. Here is my page ... judi bola online (Ellen)

Warranty Void if Removed | Collected technological projects

This article is truly a good one it helps new internet users, who are wishing in favor of blogging. Also visit my webpage: situs judi casino online

Warranty Void if Removed | Collected technological projects

As the life span is now complex and stressful and daily routine has become cumbersome and burden. Body features, however, would be the most challenging to watch since they require that this Principal be close to the person under scrutiny. 'Hotel 33' Incidence of April 10th, 1993 - Even after forty years police officers did not get yourself a clue of the 32 people and this same year the was reopened being a tourist attraction becuase of computer as being a Haunted House. my site; free background check

Warranty Void if Removed | Collected technological projects

When I initially commented I clicked the "Notify me when new comments are added" checkbox and now each time a comment is added I get four e-mails with the same comment. Is there any way you can remove me from that service? Many thanks! Feel free to visit my website: situs judi online

Warranty Void if Removed | Collected technological projects

Fastidious answeds in retrn of this query with genuine arguments and describing everything concerning that. my web site: cloud hosting indonesia murah

that's true as you said

that's true as you said There's a small cam in the fuser that is geared to the rollers, and pushes on a plastic slider that engages a photointerruptor.
seo services australia

This site is without doubt

This site is without doubt the top quality source for news post! Bye. John, expert in the field of the under cabinet tv, the perfect device to watch tv shows in the kitchen.

t

I was really struck by the uniqueness of this post. I'm just in awe of its sophistication and originality. The author is actually an incredibly talented. sop writing service

good

It's not the tools that you have faith in - tools are just tools. They work, or they don't work. It's people you have faith in or not. Yeah, sure, I'm still optimistic I mean, I get pessimistic sometimes but not for long. Advantages of etoro

davidjohn

I'm just in awe of its sophistication and originality. The author is actually an incredibly talented. Accident Claims

<a href='http://www.accident-claim.org/' target='_blank'>Acciden

I'm just in awe of its sophistication and originality. The author is actually an incredibly talented. Accident Claims http://www.accident-claim.org/

Warranty Void if Removed | Collected technological projects

There can also be a payment gateway between the service provider and the cost processor. Feel free to surf to my web page: spotify premium hack

I'm just in awe of its

I'm just in awe of its sophistication and originality. The author is actually an incredibly talented. sop writing service No Win No Fee Compensation

Warranty Void if Removed | Collected technological projects

Essentially, the act of skinning a deer is assumed of being utterly unadorned. s natural tendency to make these spontaneous woodland sculptures could be the reply to consistently taking bragging-size bucks during the pre-rut. This type provides you with all the equipment needed to set up a decent camp which has a tent, utensils, and a few food. My web page tactical flashlights

Warranty Void if Removed | Collected technological projects

Games of all sorts are a very well liked method to obtain entertainment and deer hunting games online are simply as popular. Replace the dirty, wet cleaning patch with a clean one and soak it with solvent when the rod pokes with the other end with the barrel. re fortunate -- a matched set of antlers will positively confirm that a particular buck has survived the hunting season. Here is my blog Shadow Hawk Tactical Flashlight

Warranty Void if Removed | Collected technological projects

Thank you for some other great post. Where else may just anybody get that type of info in such a perfect means of writing? I've a presentation subsequent week, and I'm at the search for such information. Also visit my website :: situs resmi judi bola indonesia

Warranty Void if Removed | Collected technological projects

Hi everyone, it's my first go to see at this web page, and arficle is really fruitful in favor oof me, kerep up posting these types of content. My blpg popst - kenceng solusindo

Warranty Void if Removed | Collected technological projects

Hi there all, here every one is sharing these kinds of know-how, so it's nice to read this webpage, and I used to pay a visit this web site everyday. Feel free to visit my blog post :: kldssd

I'm now not sure the place

I'm now not sure the place you are getting your information, but good topic. No Win No Fee Claims

you are getting your

you are getting your information, but good topic ... Accident Claim http://www.accidentclaimsguide.org.uk/

all in one printer

your information, but good topic ... Accident Claim htt all in one printer

Warranty Void if Removed | Collected technological projects

You will find these deer hunting games online have produced situations where you must hunt as if you were by using an actual hunt. Replace the dirty, wet cleaning patch having a clean one and soak it with solvent in the event the rod pokes with the other end with the barrel. re fortunate -- a matched group of antlers will positively concur that a certain buck has survived the hunting season. Feel free to visit my page: ShadowHawk Tactical Flashlight [Lina]

Warranty Void if Removed | Collected technological projects

Nice weblog here! Also your web site a lot up fast! What host are you the use of? Can I get your affiliate link in your host? I want my website loaded up as fast as yours lol Check out my blog ... agen judi bola (http://www.ia6rh.xyz2fwww.admin.isaev.info/?a%5B%5D=%3Ca%20href%3Dhttp%3A%2F%2Fbetline88.com%2F%3Eagen%20judi%20bola%3C%2Fa%3E)

Warranty Void if Removed | Collected technological projects

Fantastic blog! Do you have any tips and hints for aspiring writers? I'm hoping to start my own blog soon but I'm a little lost on everything. Would you propose starting with a free platform like Wordpress or go for a paid option? There are so many options out there that I'm totally confused .. Any suggestions? Thanks a lot! Also visit my website ... agen judi bola terbaik

Warranty Void if Removed | Collected technological projects

Hey! Do you know if they make any plugins to help with Search Engine Optimization? I'm trying to get my blog to rank for some targeted keywords but I'm not seeing very good gains. If you know of any please share. Cheers! My web site - situs judi poker yang aman

Warranty Void if Removed | Collected technological projects

Great article. Also visit my web page; gobet889.net

I'm now not sure the place

I'm now not sure the place you are getting your information, but good topic. No Win No Fee Claims http://www.nowinnofeeclaims.me.uk/

you are getting your

you are getting your information, but good topic..Blog with PDF Links

Warranty Void if Removed | Collected technological projects

A powerful culture of hunting and marksmanship flourished among the American colonies and continued prior to the close of the frontier, which happed inside the late 1800s. For one thing, should you attach authentic foliage then you'll must frequently replace your cover of attachments. Inappropriate p - H of one's soil could mean you are putting valuable fertilizer money on the drain. Also visit my homepage :: highest lumen flashlight

Warranty Void if Removed | Collected technological projects

Nice post. I was checking constantly this blog and I'm impressed! Extremely helpful info specially the last part :) I care for such info much. I was looking for this certain information for a very long time. Thank you and best of luck. Review my website: Agen Poker Terpercaya

the perfect device to watch

the perfect device to watch tv shows in the kitchen. ethemecity.com http://ethemecity.com/premium-wordpress-themes-for-2014/

Warranty Void if Removed | Collected technological projects

If as an illustration then you felt as though your working conditions failed to meet employment standards, or that your particular contract had been terminated illegally, or that you suffered some type of harassment or abuse at work - then you definitely might hire the services of your employment lawyer to be able to receive some form of compensation. Workers Compensation California states why these changes provide the Labor Code that will require the rates for temporary total disability to improve in correlation on the state average weekly wage. Back injuries are severe and want to become examined by authorized medical personnel the moment possible. Feel free to visit my web blog :: beenverified com tv5 afrique journal

re

I have seen your awareness about this theme when you post it and it really gives an informative message to the readers. Hope you will continue writing this kind of blog.

Warranty Void if Removed | Collected technological projects

Oh my goodness! Awesome article dude! Thank you so much, However I am going through problems with your RSS. I don't understand the reason why I cannot join it. Is there anyone else getting the same RSS issues? Anyone who knows the answer can you kindly respond? Thanks!! Feel free to visit my weblog ... Free simpoints

Warranty Void if Removed | Collected technological projects

Nice replies in return of this question with firm arguments and describing the whole thing concerning that. Feel free to surf to my blog post :: Agen Casino