ard(a)p850ug1.demon.co.uk (Tony Duell) wrote: Something I've been wondering about too. But what about other parts of the EP cartridge besides the toner, i.e., the photosensitive drum? Doesn't it also have a relatively short life, a little longer than the toner supply but not by much? The problem is that the observed symptoms still don't translate into a fix. Prior to replacing the job offset assembly on my NX, it had the following problem when printing to the main output bin: the paper would feed through perfectly fine, but just as it was beginning to emerge a jam. The paper was not jammed, and if pulled out manually the printout was perfect. Obviously it was simply moving a bit too slow, and the DC controller had very little margin in the number of clock cycles allotted for the sheet to clear each sensor, causing it to barf. This much was clear. The problem is, how does one go about fixing it? There was no component I could directly lay the blame on. Replacing the job offset assy fixed it, and while the practical side of me is happy (the new assy was pretty and shining clean, the old one was dirty and ugly to the sight and to the touch), the purist side of me, the part of me that reads your posts and aspires to be more like you, is still quite unhappy about the whole episode, since I never understood WHY replacing the job offset assy fixed the problem, and what exactly was wrong with the old one. I suspected that it was one of the rare exceptions, thanks for the confirmation. BTW, am I correct in that LN03R is a pure PostScript printer, i.e., PS ONLY and cannot work like a plain LN03? This would make the LN03R quite different from the later LNs, and that is why I've long felt that only the original LN03 is the real thing and that the later LNs pale in comparison. And the later LNs are based on a Canon engine, and I seem to recall a low-end cheapo one at that... Don't remember what ?X, but I seem to recall it's the same one as in "Personal" LaserJets and LaserWriters. I thought the same, and the part swapper guide gives different part #s for the IIISi and 4Si Laser/Scanner assemblies. However, a guy here in San Diego who professionally repairs these printers told me that he had swapped all kinds of parts between IIISi and 4Si that you are not officially supposed to swap and it worked; only the formatter and the DC controller are different he claimed. Maybe the scanner assembly has some kind of switch or jumper inside? MS