Answer: I had this on an AR-M450, and it was the laser.
Answer: I’ve tried replacing the polygon motor in the past and had to go back with a laser unit. Personally, I’d get the unit and be done with it.
Question: My regional tech guy called and gave me a good tip. I had my tech try it, and the machine is working and copy quality is good again. Thanks for your fast replies though!
Answer: Why not share the tech tip with the rest of us? Thanks
Question: Remove the cover on the laser unit. Then there is a cover with 4 screws. Below this cover is the laser diode. There are 2 red screws. Loosen them and ever so slightly move the laser diode. This is a tedious adjustment; I was told that it may take several attempts to get it adjusted correctly. When and if you succeed, the copy quality will be good and the E7-02 code will be gone. My tech said it took him 5 times to get it right. P.S. Don’t touch the red screws. Tech support says to replace the laser. We just saved $200.00. If this problem should come back, then we will replace the laser. So far it is working.
Answer: Have you checked the transfer cleaning unit? I have seen the blade chatter on the belt and cause banding.
Question: The band is a perfect bar; it is always in the same place, 3” from the leading edge, and I have changed out the transfer unit. I think the answer is in a timing sequence such as a gear tooth. The problem is hard to diagnose since it happens only a few times a day and I have yet to create it on site. Thanks.
Answer: Is the band a color or black? You may want to check the PCU.
Answer: Try cleaning the line position sensors and do a 1-bit with print to see if the colors are aligned. If not, do a line position adjustment and 1 bit with print to check if it took.
Answer: Just guessing but you MAY be seeing the patch during toner density check.
Answer: I had one doing this; all I did was clean the mirrors and glass. Good luck.
Question: Thanks for all the help. I changed the developer unit and the drum unit, and it is fixed.
Answer: Unplug the hard disk drive and see if it works. Address book will be gone and duplex won’t work until you replace the hard drive.
Answer: That worked. Would that also not allow electronic sorting to work? Thanks for your help.
Answer: Yeah, I have had that a few times. Take the transfer section out of the machine and to an area where you can make a mess if you open it up side down. Behind the belt are a collection area and a cleaning blade. Clean, vacuum, and reassemble. I have the manual and parts book, but cleaning will take care of the problem. Out of the several I have out, only two of them have done that, one in a doctor’s office and one on a farm. Go figure.
Question: Vacuumed out and cleaned transfer waste— looks perfect now. Thanks again