N_Cook wrote in message
...
ie the normal paper or dust slight scratches , not down to the metal drum
from loose screw or swarf. All quite normal for any OPC. Usually this is
ok
but the original toner for this m/c not available, requiring second 1 only
source, supposed compatible, formulation. Very fine scratches seem to hold
the toner , ie exposed bits of latent image retain the toner in the
scratches and so deposit as fine lines on the paper. If too much toner
passed to the OPC then more and more lines appear, so only possible to
produce grey rather than black output. The ac cleaning voltage is now at
maximum of 2.5 KV but some lines are still present with a grey image
rather
than black.
Anyone happen to know what needs adding to the toner to make it less
sticky
or whatever ? or some other procedure. I'm assuming the narrow scratches
are
physically holding the toner but thats only guessing really, decreasing
the
transfer voltage of course produces a lighter image and still transfers
the
lines, so not an option.
Physically cleaning the OPC or leaving the background heater on all the
time
makes no difference. I'm wondering if the toner is too oily and decanting
to
a tumbler with blotting paper lining would remove some of the oiliness,
before returning to the hopper. Anyone know of a test for oiliness that
gives some sort of numerical result ?

Incidently anyone know what the marking B stands for, on the preset for
adjusting the 200 to 250V dc voltage of the OPC relative to frame and what
this voltage is called ? The other presets are marked TR for transfer and
AC
for the ac cleaning voltage



I should have said the voltage on the centre of the revolving magnet
developer drum , not to the OPC, the retraction voltage ? The votage that
means the toner powder on the OPC that has become discharged from the
exposure light is pulled off, back to the toner supply side, leaving the
latent image.
These fine line toner deposits are adhering more than the 250V "retraction
voltage ?" will pull off but will pull off with the 7.3KV transfer voltage
to the paper.

Anyone know of a source of plain carbon black, fine ground, without silicone
oil/surfactants added , to dilute the supposed proper toner.