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I have a relatively new Canon Imageclass mf424dw printer that has just started to smudge the paper when I print.  It does it on regular paper and on cardstock, both through the multi-purpose tray and the drawer.  I ran the "Clean Fixing Assembly" and...
I have a new imageCLASS MF424dw.  When I autoduplex print with regular paper, it works fine, but if I try the same with cardstock (various weights) it jams.  Is there a maximum paper weight that works with autoduplex? Thanks!