Hi Guys, there's this machine which has given me so much trouble that its making me look like sort of a ''Paper-Tiger'' technician, despite all these years of experience! It's iR3300 giving BLANK copies. It all started with the trailing edge of the copy papers folding as it passes through the fixing unit; in both main and sub scan directions, but with images available (according to the m\c's operator). Then all of a sudden the images disappeared and it started spitting out blank sheets.
This is what I have done so far, over the last three days, very devotedly: Checked all the high voltage contacts for developing unit, drum unit & transfer rollers to ensure that they are making good and proper contacts,
checked and confirmed that the door mechanism really operates the laser shutter mechanism. For the benefit of doubting Thomas's, I went an extra mile and tested the following units, physically, by substitution, in another working machine: the Drum unit, the developing unit, the Laser unit, the Transfer roller, and last but not least, the Composite power supply unit. I was fortunate enough to have another customer with a similar model (ir2800) a few yards away from this machine, and he gave me total access to his machine to enable me to do a physical substitution of the above parts, one at a time. The units all tested 'positive', working very well in this machine.
Next, I removed the fixing unit...(folding trailing edge of the papers), and plugged it in this other copier, it works very well, no folding papers. I suspected that a missing HV could be causing this paper folding. NOTE: I then swapped the fixing unit, the one from the working copier, also started folding trailing edge of the papers when i put it into the faulty copier., meaning fixing unit has no problem. I confess that the only unit which I did not test by substitution is the DC controller....another suspect related to this fault.
I am now confused, years of experience in this field not withstanding, this particular fault has really been my worst encounter! Let me hear from you Gurus, if there's any magic formula to this dilemma.
Thanks in advance.
This is what I have done so far, over the last three days, very devotedly: Checked all the high voltage contacts for developing unit, drum unit & transfer rollers to ensure that they are making good and proper contacts,
checked and confirmed that the door mechanism really operates the laser shutter mechanism. For the benefit of doubting Thomas's, I went an extra mile and tested the following units, physically, by substitution, in another working machine: the Drum unit, the developing unit, the Laser unit, the Transfer roller, and last but not least, the Composite power supply unit. I was fortunate enough to have another customer with a similar model (ir2800) a few yards away from this machine, and he gave me total access to his machine to enable me to do a physical substitution of the above parts, one at a time. The units all tested 'positive', working very well in this machine.
Next, I removed the fixing unit...(folding trailing edge of the papers), and plugged it in this other copier, it works very well, no folding papers. I suspected that a missing HV could be causing this paper folding. NOTE: I then swapped the fixing unit, the one from the working copier, also started folding trailing edge of the papers when i put it into the faulty copier., meaning fixing unit has no problem. I confess that the only unit which I did not test by substitution is the DC controller....another suspect related to this fault.
I am now confused, years of experience in this field not withstanding, this particular fault has really been my worst encounter! Let me hear from you Gurus, if there's any magic formula to this dilemma.
Thanks in advance.
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