Homebrew PCBs

Hi,

I am testing a HP 4L fuser for try make a laminator. I have the service 
manual of this printer and this say:

"The fusing temperature is monitored by the DC Controller PCA, using a 
thermistor (TH901). The DC Controller maintains a temperature of about 180º 
C during print mode. If the fusing system overheats (about 215º), a relay 
opens the power circuit to the fusing heater, causing a Fuser Error messge. 
If the fusing system exceeds 240º C, the thermal fuse will open, cutting 
off power to the fuser."

Hope this info helps.
(sorry by my english)

Esteban Arias
earias@...


At 14:47 16/01/2004, you wrote:
>Greetings Gentlemen,
>Have been following this thread and others with interest.
>
>Was intrigued with the temperature that HP was using on their fusers
>(ceramic - higher, H. Lamp - lower) so I contacted their Tech Support
>and asked them. Seems that their latest model uses a fuser set at 291
>degrees F.  No info on what temperature the toner melts at.
>
>I'm using an old LaserJet 4L and an equally old cloths iron to do my
>work and am not having any real problems.  I preset my iron to a mark
>between Cotton and Linen. I use an 1-1/2 inch pad of paper below the
>board, which I preheat with the iron. When everything's warm, on goes
>the board-etc. and the 'ironing' begins. The hardest thing I have to
>remember is to not press down real hard. If the board is to be double-
>sided, after a bit I flip the board and continue ironing. I generally
>do about 2-3 minutes total for a 4x6 board. The largest board to date
>has been a single sided 6x18.
>
>Hope the temp info helps,
>Mike