Homebrew PCBs

Did a small workaround to solved it !!! i printed first layer then 
rotate drawing 180- degree then print the second layer(mirror)!!!, 
Why ?? it prints the 2 layers the same way so they gets the same 
offset in the middle , aligning properly for transfer !!!


--- In Homebrew_PCBs@yahoogroups.com, "Russ Blakeman" <rhb57@...> 
wrote:
>
> If working properly they will register correctly as long as you 
have the
> thing to print exactly centered in the page. Also there is a 
duplexer you
> can find cheap for the LJ 4 and 4 Plus, sits under the printer and 
you
> remove the back cover where a cover for the duplexer replaces the 
back. The
> duplexer is L shaped. You can also set an optional 500 sheet tray 
under
> that. The LJ 4 and 4 Plus also has an envelope feeder option. All 
can be
> found cheap enough. To upgrade memory dig out that old 72 pim ram 
from those
> old 486 era machines.
> 
> The fuser on the 4 and 4 Plus are different and non-
interchangeable. The
> rollers and many other parts are the same  including plastics. Both 
can use
> an inexpensive MIO type print server/network card.
> 
> I do this for a living and signs are an additional business added 
in the
> last year although I have lots of experience in it since the 70's 
including
> silk screening. Also if anyone ever needs a fuser rebuilt 
reasonably or
> their printer repaired (UPS shippable no bigger) I can repair most 
brands
> and models, inkjet, thermal, impact laser/LED and dye sublimation - 
assuming
> I can get parts, if needed.
> 
> 
> 
> 
>   -----Original Message-----
>   From: Homebrew_PCBs@yahoogroups.com
> [mailto:Homebrew_PCBs@yahoogroups.com]On Behalf Of teknochaman
>   Sent: Wednesday, March 28, 2007 11:30 AM
>   To: Homebrew_PCBs@...
>   Subject: [Homebrew_PCBs] Re: Laserjet 4 plus Problem !!!
> 
> 
>   Hi Guja,
> 
>   Let me say that LJet stuff wasn't technically possible
>   when it appeared (mid 90's)
> 
>   I used to register double sided for offset duplication
>   and I couldn't get it.
> 
>   Trouble is the mechanism of the LJIV, as they weren't
>   prepared to 'register' precisely on both sides.
> 
>   That could be work for the models being 'double-side
>   enabled' then corporate office printers of the mid
>   90's.
> 
>   You'll ned to do some manual guide positioning system
>   for proper alignment.
> 
>   Hope that helps.
> 
>   Re: Laserjet 4 plus Problem !!!
>   Posted by: "guja" guja2001bg@... guja2001bg
>   Mon Mar 26, 2007 2:03 pm (PST)
> 
>   print them both at same time. ( two cdrs, side by
>   side)
> 
>   Bruno St-Laurent <bsl88k@netscape. net> wrote: Hi guys
>   , i'm trying to print a PCB of 2.5 x 10.25 inches dual
>   layer ,
>   the print are proper lenght but the middle of the
>   print don't match(
>   offset) !!!! it seem that the printing is not linear
>   !!!
> 
>   any of you have an idea ???
> 
>   BSL
> 
> 
> 
> 
> 
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> 
> 
>   
> 
> 
> [Non-text portions of this message have been removed]
>