Originally Posted by
Eremite
I'll write everything at once.
Check the Vt value.
If Vt is normal (about 2,5v) - developer is dead.
You can replace PCDU or replace the developer to type 28, but only 270g from package.
Also inspect and clean gears and bearings of augers into the developer unit.
If gears are broken, replace them whit a compatible one.
Gears and bearings must be lubricated.
After replacement initialize the developer.
if Vt is less than 1, you have overtone.
Do not use PCDU from 1515 in MP301 because the developer is different
P.S. sorry for my english, this is not my native language.
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