6501i - Gray background after 4 or more

**Samanator** · 02-20-2021

I went out on this machine on 2/5 for background after 4 or 5 copies. The machine has a little over 378K on it. When I got there, I inspected and cleaned the charger roller, developer unit, drum unit, inner slit glass, all the filters, and the inner cavity. This inner area and sub-assemblies always seems to dust up on these Kyocera B/W machines. I updated the firmware with hard boot. I ran U464 and U410 then hard booted the machine. I ran a bunch of copies after that and they were fine. I had the customer run a bunch (being a law firm, they did) and they came out fine. I left with a happy customer.

In spite of the big freeze going on here in Houston, the customer contacted us on Friday 2/19 saying the problem had returned.

I’ve been away from copiers for a few years but there something that seems familiar about this problem. I think it has something to do with the developer unit. Like maybe it’s gone bad (like my ex).

Any help would be appreciated (with the machine, not my ex).

**blackcat4866** · 02-20-2021

Is the registration roller cleaner picking up a lot of toner? Is the developer duct blocked with toner? The ducts gradually become completely blocked with toner.

My suggestion is to remove the developing unit, and apply your vacuum cleaner nozzle to back end. Remove the fan box and apply your vacuum nozzle to the duct through hole in the back cover. CAREFULLY open up the fan box and vacuum out the ton of toner inside and the filters.

developer duct1.jpg developer duct2.jpg developer duct3.jpg

I'd really like to see samples, but this is my best guess based on ... experience, I guess. =^..^=

**Samanator** · 02-21-2021

Damn!!! I completely forgot about the developer ducts and the fan box. I knew there was a reason I was putting the vac all over the place.

Here is the picture sent to the office. The paper is being run letter speed, not R.