On 15/02/18 14:10, Graham. wrote:
On 15/02/2018 07:33, Brian Gaff wrote:
Well several things really. Where have they been stored. What is the state
of the toner, could damp have got in? The drum is often part of the toner
cart so try a new one. The corona wires can and do get corroded as well and
of course the high voltage generator could have been compromised by damp or
merely by deterioration of capacitors in the power supply.

Brian


Since nobody has mentioned it yet, have you put new paper in? I have
taken an HP laserjet out of the cupboard after 5 years and had it print
flawlessly, so something has deteriorated in your case. Most likely is
the paper.


Really? That used to happen with thermal fax rolls, but laser and
inkjet printers will pretty much work with any old paper.


99% certain the drum is damaged. Try cleaning with alcohol, but expect
to replace it.


But with HP that's upgraded with new toner.



--
Future generations will wonder in bemused amazement that the early
twenty-first centurys developed world went into hysterical panic over a
globally average temperature increase of a few tenths of a degree, and,
on the basis of gross exaggerations of highly uncertain computer
projections combined into implausible chains of inference, proceeded to
contemplate a rollback of the industrial age.

Richard Lindzen