Homebrew PCBs

At 12:38 PM 3/22/2006, you wrote:
>Hi Carl,
>
>Do you by chance know what a "50" error code would be for an HP LaserJet
>Series II?  I have a printer in really good shape that I'd like to get going
>again.  Or maybe you've discovered a service manual URL?
>
>I've taken apart a few HP printers in that series, so I HAVE some parts!
>
>Thanks,
>
>Alan  KM6VV


There are a lot of resources online:
I always used these guys:
http://www.all-laser.com/
But the link on their page to the 50 error seems broken.
another link
http://www.repairfaq.org/samnew/printfaq/pcfljiiiec50.htm


If I remember correctly error 50 is exactly what I mentioned in my last post.
95% of the time, the triac that power the fuser lamp in the power control 
module (the cube where ac comes into the printer) is blown. Remove the 
screws around the module and it just unplugs from the printer base. You do 
have to remove the printer cover first.

  You can replace the triac with almost any sensitive gate triac that has 
the volts and amp rating. I've  been known to buy the highest voltage 
to-220  package triac that radio shack had on the shelf for an emergency 
repair. That printer is probably still working.

If you have spare parts, try just swapping the power cube and see if the 
problem goes away. Then you can take your time fixing the module.

-carl