52 scanner error

[MrDrap]

Hi, Today I got this error on one M521dn.

I change the RM1-6322 Laser/Scanner and the printer works fine.

[rt67]

I have alredy replaced that and the dc controller bd. Mine still doesnt work.

[MrDrap]

Then, seriously, the problem was the Power Supply that put the Laser ON:

Is a little complicated change this item. RM1-8514 . But you can see the Laser connector there marked in red.

[ivar_pusa]

Last time was me helpful to eliminate this 52 error on HP LJ Pro MFP M521.
We changed network link speed from auto (gigabit) to 100-Full Duplex.
Somehow was this linked with scanner memory usage.
Maybe this solution will help you also.

[devin1955]

Worked for me too, except I set mine to 1000T Full

Thanks!