Hello all,
I have a new-to-me RZ990 (just under 3million impressions) that is having some serious feed issues. I have been trying to solve this issue for weeks and I am finally at my wit's end.
When making a master, the paper jams (leaving the drum to imprint on the pressure roller), stopping sometimes at the guide/timing roller, sometimes at pressure roller, and sometimes (rarely) it will pass through all the way. Always with a J8 error.
In addition, when it does feed, the prints jump wildly from print to print. Here is an image of two sheets that were printed in sequence overlaid with light shown through to see how much the position is jumping vertically:
rz990_jump.jpg
Things I've tried to resolve this:
None of that worked, and eventually, I couldn't feed at all. At that point, I decided that the machine must be out of time so I started taking it apart. When I got to the main gear, I discovered that machine's timing points were indeed still in the right place, but the screws holding the main gear in place had come loose. All three screws were loose, and one had even completely worked its way out, like so:
rz990_timing_notches.jpg
(you can see the timing notches in the circled area)
I tightened the screws and thought that surely I had solved my problem - but, alas, it remains. It is feeding again, but with the same inconsistency as before (the above photo illustrating the jump was taken last night, well after the screws were retightened)
All of these issues still have me thinking that the timing might be off, but all of the timing notches/timing holes seem to be in the proper position, and I know it's not the clutch because both the old and new ones are behaving in the same way.
Any ideas of what this could be?
Thanks in advance!
I have a new-to-me RZ990 (just under 3million impressions) that is having some serious feed issues. I have been trying to solve this issue for weeks and I am finally at my wit's end.
When making a master, the paper jams (leaving the drum to imprint on the pressure roller), stopping sometimes at the guide/timing roller, sometimes at pressure roller, and sometimes (rarely) it will pass through all the way. Always with a J8 error.
In addition, when it does feed, the prints jump wildly from print to print. Here is an image of two sheets that were printed in sequence overlaid with light shown through to see how much the position is jumping vertically:
rz990_jump.jpg
Things I've tried to resolve this:
- All of the obvious feed dial settings
- Adjust the parallelism of the guide/timing rollers
- Remove and clean the 2nd feed paper sensor (thinking maybe a blockage there would stop the paper)
- Remove / clean / return existing feed clutch
- Completely replace the feed clutch with a brand new one
None of that worked, and eventually, I couldn't feed at all. At that point, I decided that the machine must be out of time so I started taking it apart. When I got to the main gear, I discovered that machine's timing points were indeed still in the right place, but the screws holding the main gear in place had come loose. All three screws were loose, and one had even completely worked its way out, like so:
rz990_timing_notches.jpg
(you can see the timing notches in the circled area)
I tightened the screws and thought that surely I had solved my problem - but, alas, it remains. It is feeding again, but with the same inconsistency as before (the above photo illustrating the jump was taken last night, well after the screws were retightened)
All of these issues still have me thinking that the timing might be off, but all of the timing notches/timing holes seem to be in the proper position, and I know it's not the clutch because both the old and new ones are behaving in the same way.
Any ideas of what this could be?
Thanks in advance!
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