Need some help and advice. Working on the above device with 2 seperate issues.
The end users say that sometimes the pages come out black or really dirty and copy is unable to be read. I was unable to duplicate this while out on the call. I did though clean the device and also cleaned the charge unit really well as it looked like it had toner on it. As per the SM (4035, don't have the 4030 but thought it would be close) it looks to be charge unit related and than it goes into PCB's. Also there is little specks on the print out coming from the drum unit but users don't want to replace drum yet as its not bad. If this problem comes back I was thinking starting with the Drum and charge unit first before getting into boards? Has anyone seen this before or other suggestions to check?
Second issue is the device jams when duplexing. Not everytime but enough to duplicate the problem. I only have the service manual for the 4035 as mentioned, is there a seperate manual just for the duplex unit (more than what is in the copier SM)? The paper stops prior to re-entering the device below the drum after printing the first side. When it jams it appears to be a timing issue b/c its not catching on anything so thinking it is slipping somewhere. I know there is 2 sets of rollers upper and lower feed rollers and pulleys. Would these be a good place to start? I saw there is a clutch in there as well. Wasn't sure if it is slipping up near the exit area as it re-enters the device heading into the duplexer, or if its slipping as it comes out of the tray. Is there a better way to pin point where it could be slipping? Or is there something more common that goes on with these that should be tried first for this problem?
Thanks for any help in advance.
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