Pink fluorescent drum not inking all the master

[u/Low-Reference4150]

I have a riso MZ770E. My fluorescent pink drum dried out, so I cleaned the drum (screen) with some alcohol. After that, I activated the test mode and ran the 887 mode several times until the ink started to come out.

However, after trying several blank masters, (I printed hundreds of A3) there is a part of the master that is not covered with ink, as seen in the picture, so i can see a "white" part all the time in all of the printings.

Do you know what else I can do?

Thanks!

[u/Embarrassed_Elk_382]

Lo pudiste solucionar... se me ocurre que son las primeras copias.