T.E.S.T.C.O.P.Y.

I have problem on L1300, CR lock error 51 H. 2 lights-red blinking? No paper jam inside.Maybe problem motor PF,CR motor ,Asf paper assy ???

Replace the pump assembly.
I highly recommend it because the sublimation muck can not be completely washed, and the gum of the mouth guard is generally corroding. And maybe with a problem engine.
In short, the consumable is in alterations for solvent or sublimation.

taken from here https://resetters.ru/index.php?showtopic=34294