DI 620 - error C0220 and C0200

[mcprest]

I have a Di 620 with problems: c0200 and c0220. i have studied the manual and i cleaned all the parts involved, i have changed the HV1 board and the HV2.
Sometimes it prints 200 copiesuntil the errors appear sometimes it prints none (the error appears after i press start).
I have made the F2 adjustments, The F8 and F5.
I have no ideas, please help...

[mcprest]

I have also checked the quantity of developer and it's good (820g). And i have cleaned the developer station entirely.

[montana]

hi...check or replace the mc charger corona..or the t/s corona
i guess there is a charge leak
i hope this help
regards........

[tonerspot]

check drum ground plate

[mcprest]

about the drum ground plate - i have checked that, cleaned her and measured the conductivity and it's ok
about the mc charger corona..or the t/s corona - i guess it's about the isolated heads ?? i proceed to make a double isolation on them, but the result is the same. I have even changed the charging corona and the transfer corona from a di 520 that is in good function conditions, but problem still persists. ...

[mcprest]

please help......