Originally Posted by
rsantos325
Thank you for the quick reply! Here are my findings:
Replacing the belt, I vacuumed the entire conveying unit and thoroughly dusted and cleaned and double checked any grounding points. I removed two mylars from the rear of the machine guide per the tech bulletin (I200) as I found it tracked to 11mm from front edge of belt to frame. It has been common occurrence that removing all mylars is required. But please be sure double check when replacing any transfer belts for the 00, 01, & 7002i, 8002i series. After replacing I ran U464, U410, U464, U412.
Prior to Transfer belt being replaced, the black bands would occur anywhere between 10-20 pages. I ran about 300 pages and the black band issue stopped so far. At first thought, it is weird that the transfer belt would initiate the black band as the image or biases do not originate from the transfer belt. I believe the issue is that it is shorting or arching the drum in a way that causes the black banding issue. That is why it happens randomly.
As a theory, this short or arch may be causing the boards to go bad.
Or even the drum...
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