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Question: I have a Di 450 that eats the starter at maximum
20,000 copies. I find starter in the toner waste bottle, and I’ve
replaced the entire drum unit with one from another machine two
times, but the same thing happened. I also cleaned all contacts. Has
anyone encountered this situation? (The copier has 350 000 copies,
so it is not very old.
Answer: Did you reset the drum and developer counter? Did you
run the F8 operation? Did you set the ATDC setting in the
adjustments mode? Did you vacuum the developer and blow the ATDC
sensor? Just trying to figure what has been done.
Answer: If this is an 8 digit serial, it’s possible the
developer assy is bad. They swapped these for the 470 series. It may
also be due to a problem with the bias contact.
Question: Unfortunately I have done all these adjustments
when I changed the developer, and I even replaced one developer unit
from a Di 470 because I understood these units are better, but I had
the same results. This copier is put in a place with some metal dust
but I don’t think this is the problem because I’ve cleaned it
frequently. Maybe it could be a board?
Answer: Metallic dust plus iron oxide in the developer? Could
be a possibility. After all, if the dust is fine enough it could get
in. Of course in that case, you would need a breathing apparatus to
work on it. If it were a board, I’d think it would happen a lot
sooner.
Question: Thank you for your answers. If I find a solution I
will post it. Thanks again.
Answer: Try replacing the HV unit for the coronas, which may
be shorting and pulling developer but not on every copy. I had a
bizhub 500 pull this little stunt.
Answer: Something else I remembered: If the transfer guide is
too high it will pull developer.
Answer: Is the housing that the latch latches to shut? Is the clam broken on the left or right side?
Answer: Is there a photo SW up in the optics? It seems the scanner triggers the paper re-feed after it stops at the registration roller. If it’s there, take it and wash it in hot soapy water, let it dry and try it. It’s just a guess, but I did have something like this on one of these cheap Canons and that was the fix.
Answer: I’ve had a couple of these over the years and it was the DC controller PCB on the back of the machine. Maybe you can find a parts hog out there somewhere.
Answer: I’ve got some parts, but let’s see what E- 240 is. Ah, here it is: “E240: DC controller or composite power board.” So since it has been smoked I would make sure the AE sensors are clean, pull all connectors from the DC controller (behind the CP) and plug them back in to clean any carbon from the pins, and do the same for the main board (composite PS) on the back. Usually the optical codes are E-220 or 210 and on the PC-900’s that would point me towards the lamp or scanner drive solenoid pin. But with a fire and more importantly smoke exposure machine, you could be facing any of a number of off the wall peculiarities. Good luck and let me know what parts you might need.
Question: I kind of figured it must be something dirty. Where is the AE sensor? I will look around for it. I am going to try and sell this guy something else but in the meantime try to get it going. Thanks
Answer: There is a spring that is by the left rear of the drive assy. The housing that it attaches to breaks; you can put a hole in the shell above the part that breaks off the housing reconnect spring. This will fix the problem.
Answer: If single sheets feed fine and multiples jam, it sounds like there is a problem with the paper feed clutch for that tray.
Answer: Watch the paper very closely to see if it is feeding in and then back out. There is a one way bearing going bad on the end of the feed roller shaft. I’ve seen this problem many times.