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I have had very similar on this model before . It was the K charge grid

I agree with Mark , we have had this regularly when the drums get down to metal , they strip the developer exactly like your picture

Photo for previous post...

Over here in Australia we have had same issue many times. Has only been on 15 series not 05.
Toshiba provided us with a spare part modification.6LK50637000 – ASYS-BRKT-LINK-SUP which we can order as...

CB30 is a finisher issue not LCF !

You may want to try Carriage position adjustment during scanning from RADF 05-3046 (black) and 05-3047 (colour)