Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

doing small series really speeds up the learning curve...

i tried 1 run through the fuser -> 2 small errors where the toner didn't
stick.

later i remembered i used laquer thinner instead of denatuerd alcohol to
clean this time.

so i made the 3rd board with denatured alcohol cleaning again and 1 run,
-> no errors.

I have noticed several times now that laquer thinner does produce errors.
i guess it does not degrease the surface as good as alcohol does.
it might also be that this bottle of thinner is contaminated with grease
(e.g. wetted a greasy rag by pressing against the opening and turning
upside down)

i timed the feed rate of the fuser at 10mm per minute.

If someone can think of a way how to measure the pressure easily i will do
it.

The temperatuere is at 160 degree C.

ST

oh, yes, my step-by-step procedure:

Switch on printer
plug in fuser heater, temp control, and turn on motor (even heating of
drum).
put a half A4 paper in printer.
print.
while printing wipe the pcb with laquer thinner to get off grease.
sand transfer side of pcb with 600grit paper
wet a corner of a paper towel with denatured alcohol.
wipe the pcb and dry with another corner.
then again wet a corner of the towel with alcohol and wipe the pcb
do not dry it but place it on top of the fuser to dry.
cut out the in the meanwhile printed paper.
align, and feed into the fuser.
take out (pliers) and drop in water.
immediately start rubbing, take of most of the paper fast.
only leave the last layer of the paper (coating).
now dip again in water and rub off the last layer.
now take a piece of foam rubber and give the board a strong rub.
It will take out any paper from the drillholes, and where traces are close
together.
flush, ready.