Thanks for all your suggestions about the image quality problem.
The machine has done 310K, which I reckon isn't overworked. The second counter (which I suspect is a PM counter?) is on 60K.
All the mirrors (6 of 'em) are spotless, the transfer roller has been dry wiped, primary charge roller has been cleaned. I've vac'd the waste toner out of the hopper on the drum assembly.
There are a lot of fine lines on the drum surface, which would account for the feint intermittent dark lines running in one direction, but not for voids.
The mag roller is getting evenly coated - the "brush" looks good in fact.
I never thought about the scan rails - they are next on my list. That may well account for the fact that every 5 of so pages, the voids are almost gone.
I think the drum is probably well past its best - its a light purple colour - probably not an genuine Canon part ?
Will let you know how I get on.
Thanks again.
MJ
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