MPC7500 Toner Pump Failure

[Shadow1]

I've been having way too many of these turds severely undertone themselves (usually black) and I've finally caught one in the act today.

The customer was printing a duplex 11x17 document with heavy black text, and high density red and orange images. Black was totally trashed, but the magenta was just starting to go.

ID sensors were nasty, so I cleaned everything up and tried to force add toner to M and K - to my surprise, Black density came back up nicely but Magenta would not, and finally came up with a toner near end condition on a nearly full bag.

The toner line was clean, so I tore down the pump (yuck!) and it had gotten hot enough to fuse a big clump of toner right in the inlet as well as chunks all through the screw and it had the rubber worn out and breaking down.

Has anybody else seen this?

Given the number of chunks I've had to clean from behind the doc blades on these machines, I suspect this is happening to a lesser degree quite frequently.

I also suspect since the toner in this machine is 10% carrier that the abrasiveness may be wearing the pump causing them to run less efficiently and produce more heat (maybe why the lowered the content in the Pro C700 and C900)

Thoughts???

If this is common I may start replacing the pumps on some sort of PM basis - it would save me a lot of trouble to get these beasts running on par with their predecessors.

[msaeger]

I haven't put any more in than I did with the 3260. Any I have had a problem with I didn't take them apart I just put a new one in.

How are you cleaning behind the doctor blades ? mylar thing ? It would be nice if they would put a tool out to line it up so I could just take them off to clean. I had so many problems with that on the 3260 I was carrying developer units. I haven't been having a problem with the MPC6000.

[jarhead2020]

We have a customer with around 550k color and we had to replace both cyan and magenta pumps. The pumps are sealed and it stinks because each pump costs $240. I was going to replace all four since cyan went first then a week later magenta went. What a piece of crap we all try to avoid going to them at all costs lol.

[Shadow1]

Yeah, its the Mylar thing

My machine has about 500k on it as well, and would have more if they could depend on it for production. I'm trying to get it upgraded to a C900 and eventually pull a press out.

I only pulled that pump apart out of desparation - the customer had a big job, and I had already been longer than I wanted getting to them. I can see why they make it an assembly - its a big mess.

[stephend]

Never had a problem with the pumps yet on my machines but my colleagues are replacing them in accounts where customers runs those machines as color production units.
Big mistake to consider a 6000 or Pro 550 a color production machine. It can not keep up...neither the toner add system, neither the cleaning system.
If this machine will have cleaning brushes, blades and drums like 2060...it will be something
Definitely is something wrong with this toner/ dev combination that is causing the chunks, especially in low humidity conditions.
Winter is around the corner and everybody started already the heating systems...so it will be fun, fun, fun.

[slot]

The loner has a much lower melting point these days so that is why if it gets hotor even warm say in your car it starts to melt together>AS for the black washing out here is an idea that when i next go to one i am going to try. In the service manuale look at SP3101 1 to 4 it gives the idea that the black patch is to reflective so it would undertone by changing the way the patch is printed it may keep up with toner demand better i dont often go to these machines but it may be worth trying