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I can guess the thread may be dead by now, but anyway. I have the same problem but without errors just lots of dust, can you help me where exactly that filter is or how it looks like please?

Exactly my problem to be honest, didn't know that was a thing and was just checking if drums are identical.
Thanks a lot everyone for help

a little upd on the whole situation, replacement procedures I believe were done correctly and it had pass all the adj but I'll do toner density initiation again, yet it's just a weird start of error...

I'll check the shutter opening gate. That started after developer replacement, aut developer charge was donw, automatic color registration was done, automatic gamma adj was also done and few prints...

After replacing the developer I got a whole bunch of problems although all the adjustments were passed and done quality wasn't quite good. Checked the cleaning unit of the ITB and the belt itself and...

So finally it's solved. replacing the prcb and 2 write units but now that thing works.
Although now doing duplex top to botom even if the file is top to top for sure but i guess that's another story

Update on the whole situation, tomorrow the used one working prcb will arrive and my concerenes are about the firmware version of it. Didn't find any info on how to update it, except that it needs to...

Quite comical thing is that's what pretty much happened in my case, if the units are open the shutter is way out of range of the sensor, various manual adjustments didn't have any affects even...

You're right, terrible idea.
Ended up now ordering some used units entirely, because that's the only option.
Can you help me out what to do when swapping them? Really don't want to end up with 6...

tried exactly this but none of my attempts were successful, sometimes the actuator was way in a wrong position after i give it a try. Is there any way to disable color registration with dipsw, or...

One more thing, swapped M and Y units and ran the machine in both cases err 4512

Forgive me, but if you by any chance know what the approximate range of skew adj. I've tried to move it manually by simple rotating the motor but however didn't know where that range ends to...

Btw about write sensor initial position memory (that's not the same of course but in case that's matter evev a bit)
+00078 Y
+00021 M
+00053 C
+00081 K

Sending anything to Russia now is quite challenging I suppose.
However, are there procedures I need to do right after swapping the write unit like in i/o checkmode, and also if there is any way to...

Both sides adj. giving the same c4512 error.

Color reg auto adj. In fact returning me c-4512/11 errors. Although I'm not really sure what's the value range for it to look at the old data.
One more thing i'd like to make sure about is how chart...

I'll try that but a little bit uncertain about what to clean it with, will rubbing alcohol will get the job done? One more thing, tilt correction home sensor and/or the motor for Y and M write units...

These two error codes appeared after chart setting of the two side printing. Service manual says to check input for the motor and tilt correction home position sensor but I really have no clue what...