Homebrew PCBs

I did execute the described experiment.

i taped a stripe of aluminium foil on one half ot the page.
then i printed a page with X all over.
cut the power as it was halfway through.


Inspection of the srum shows just what i thought.

before point of contact:
clear image, thick.

after point of contact on paper half:
very faint residue, if you don't know what it is you couldn't read it.

on aluminium half:
about half the amount of toner still on the drum.
image printed on aluminium foil but not as dense as on paper (holes too).


for me this shows my guess with "charge shorted but some toner still 
transferring"
was very close, even the 50/50 is about what i see here.


What does this tell us:

either double the amount of toner on the drum (which may lead to problems)
or get the foil charged, without shorting out to ground.
this may be possible, maybe even by simply removing all the grounding 
wires on the input
mechanics, and using nylon screws (or glue or isolators or.....).
then maybe it would be good to somehow attach the high voltage fron the 
corona wire to the copper.

( i do not think the charge can be brought up by infulence over distance 
like on paper)

look forward to discussions.

ST