asked Jan 11, 2008 at 4:06am
Hp HP LaserJet P3005DN

HP Laserjet P3005DN

Hi Guys,
I need to upgrade HP Laserjet P3005N ( HP part# Q7812A ) to HP Laserjet P3005DN ( HP part# Q7815A ). Does anybody know how I can do that?
Any ideas?
by Ypshec on Jan 11, 2008 at 6:23am Add comment
What is a difference between Q7812A and Q7815A ?
by Anonymous on Jan 11, 2008 at 10:27am Add comment
I don't even know if you can add a duplexer to it. I've done crazy stuff like that only to find out there were mounting pieces missing, etc. I eventually learned to not even attempt conversions like that. I could be wrong and you just order the duplexer assembly (if you can find a p/n) and it would just install with no problems.
by moe on Jan 11, 2008 at 5:26pm Add comment
You probably have to replace the formatter.
by Stephen on Jan 11, 2008 at 8:42pm Add comment
Q7812A means it uses 12A toner cartridge?
Q7815A means it uses 15A toner cartridge?
what it means to upgrade? you have to change the entire engine?!
by joy_boy on Jan 12, 2008 at 6:21am Add comment
You're missing the point of his question. He wants to upgrade it so it will duplex. Has nothing to do with toner cartridges. - moe
You can not upgrade a base model to duplex plain and simple. If you look at the service manual the dc controller which controls paper movement does not have two different part numbers one for duplex and for non. If this is the case it means the information for duplex operation is stored in the printer in two places at time of manufactuer (most likely the formatter and dc controller) so when you change one of the parts the other one reads the information and updates its eprom with the same info.
by dmzcompute on Jan 12, 2008 at 1:46pm Add comment
to moe:
i am sure i misunderstood it. as an upgrade i understood you have a base model, then add something to it and upgrade it. if the case is to return (or sell or something) the old model, and take new one, then ok.. i did not check in hp, but, if one printer uses 12A cartridge, it will hardly become to use 15A cartridge:
" Post to this thread Post a new message thread

HP Laserjet P3005DN by Ypshec (1/11/08 12:06 PM) reply + / -
Hi Guys,
I need to upgrade HP Laserjet P3005N ( HP part# Q7812A ) to HP Laserjet P3005DN ( HP part# Q7815A )"..
I repeat again - if the case is to replace the old printer with new one - then ok. but you /moe/ was talking about adding a duplex or something, so i was thinking of upgrading a base model with parts, not "replace" a model with other.
by joy_boy on Jan 12, 2008 at 4:21pm Add comment
Joy boy,

If you read the intial post the person wants to upgrade a non duplex model to duplex and asks if it can be done. In effect we have told him he can not do it. The toner cartrdige has nothing to do with it, plus you are mistaken about the toner cartridge models. The numbers he gives are printer model numbers. Both these printers use the 51X toner.
by dmzcompute on Jan 12, 2008 at 6:13pm Add comment
Joy Boy, you are very confused...

A Q7812A is not a toner cartridge!!!

Q7812A is the product number for a LaserJet P3005 printer.


A Q7815A is also not a toner cartridge!!!

Q7815A is the product number for a LaserJet P3005dn printer.

by Stephen on Jan 12, 2008 at 8:13pm Add comment
sry then, my mistake

by joy_boy on Jan 13, 2008 at 4:46am Add comment
I think he has just mistaken them for the HP 1012,1020 series printer cartridge Q2612A that everyone refers to as an HP 12A. Same with the HP 1200 series, he is thinking of an HP 15A for this one. The actual cartridge that the HP Laserjet P3005DN takes is the HP 51A and HP 51X cartridges. The number for those cartridges are Q7551A and Q7551X. The upgrade question he is asking is simply going from a P3005n which stands for network capable, to a P3005dn which stands for duplex, and network capable. So he is wanting to add a duplex printing option to the P3005n that he has. Duplex Printing is not the standard duplex most of you are thinking. It means two sided printing options. Goto http://h10010.www1.hp.com

It will explain it is an option to print on both sides of paper. The P3005n has a manual drive support for this.
by unknown on Oct 13, 2008 at 12:26pm Add comment
I i replaced new formatter for my printer laserjet P3005, need to upgrade new firmware of the new formatter???
by bench501 on Jan 30, 2010 at 1:33am Add comment
I think everyone (except dmzcompute) is missing the point of this thread. He wants to take a simplex model and upgrade it to a duplex model.


I am currently trying to convert one myself and am having a bit of difficulty, so I appreciate any insight anyone has in doing this.

The simplex model and duplex model don't appear to have any discernable difference in parts, apart from the plastic gears on the duplex plate dowels, that sit right next to the main motor (slightly to rear of printer of main motor).

I'd torn two non-working ones apart, yanked out those gears and slapped them into a simplex one and everything APPEARS fine, but duplex isn't showing up on the path test menu, which leads me to believe what dmzcompute has said, in that the code that differentiates duplex from simplex is stored in the EEPROM of the DC controller and the formatter.

I know they did something very similar to this with the 4250/4350 models remembering that they're either 4250 or 4350 (the parts are identical in both machines), through a code stored and copied between the DC controller and formatter, so it's very likely they did it with this one too. I recalled seeing a paper on how to trick the 4250/4350 models to either remember their true model number or to spoof the model number, but don't remember where I found it exactly. Perhaps there's a similar method used to upgrade a P3005 to P3005dn???

If I get it working, I'll let y'all know, but I'm more likely to cannibalize this one for parts. :-\\

by unknown on Mar 22, 2012 at 3:50pm Add comment
Both models have the same engine. The code for duplex is built into the formatter and dc controller. I think the folks at Metrofuser has figured out how to wipe a board so in theory you can covert if you know how to wipe the board and then are able place the board (Formatter) in a current duplex printer. By doing this the code from the dc controller of the duplex model will write the coding for duplex to the wiped formatter so it is now duplex. It should then work as a duplex even if the dc controller is not. I know that I have repaired many of these boards and at times when I go to a customer and the formatter is bad and I bring a simplex model and they never duplex and say it is ok to put the simplex in their printer it now becomes a simplex printer. After I repair the board and place in a prior simplex model it will now duplex.
by dmzcompute on Mar 22, 2012 at 6:31pm Add comment
If I remember correctly, simply swapping the non-d simplex formatter with a d formatter will do it (as DMZ explained).
I did this once by accident, and later realized I had added duplex functionality.
by eric111 on Jun 22, 2012 at 3:33pm Add comment
Can a standard P3005 be upgraded to a P3005N with just a formatter board and memory, or is there more to it?
by emptyhead on Sep 10, 2012 at 7:50pm Add comment
You have an EIO slot so just adding an EIO network card, 610N 615N or 620N will make it a N model without having to change the formatter.
by dmzcompute on Sep 11, 2012 at 5:02am Add comment
I have converted the P3005N in P3005DN changing the formatter board, but I have converted the N model in DN model only in P3005 machines. In 2420 model you must change the DC board too, because like DMZ say, the information is between the two boards, but in P3005 the information is only in the formatter.

But I have a question about it. The part number of the P3005 formatter N and DN is the same; where is this information??
by marionubal on Jun 21, 2013 at 9:31am Add comment
The information is stored in both the formatter and the dc controller. If you install a new unused formatter in a duplex printer, then the information is copied from the dc controller to the formatter. Information is the model number, serial number, network settings and of course duplex if that is the type of model. When you install a previous duplex formatter in a non duplex printer it will then print duplex but that is only if the formatter has come out of a former duplex printer.
by dmzcompute on Jun 21, 2013 at 8:29pm Add comment