MP 2550 PCU

[tinfox]

I rebuilt a pcu and I'm getting ghosting spots around the edges of blacks. I've attached a sample.


Thanks in advance!

sample.jpg

[LNorris]

Re: MP 2550 PCU

what parts did you replace in the pcu rebuild?

[tinfox]

Re: MP 2550 PCU

what parts did you replace in the pcu rebuild?

Drum, Drum blade, charge roller

[LNorris]

Re: MP 2550 PCU

did you replace developer? how many copies on it?

did you check print before it hits the fuser?

[tinfox]

Re: MP 2550 PCU

did you replace developer? how many copies on it?

did you check print before it hits the fuser?

I tried a different pcu in the machine and it worked fine. Also I took the rebuild to another machine and it left the dots.

I'm not sure how many copies are on the dev, but the blacks looks good.

[copier tech]

Re: MP 2550 PCU

If you have another good PCDU swap that dev unit with your rebuilt drum.

[tinfox]

Re: MP 2550 PCU

If you have another good PCDU swap that dev unit with your rebuilt drum.

Unfortunately that's the only one I have. Its been sitting in the warehouse for a couple of years and I thought I'd give rebuilding one a shot. I'll have to wait until I get another I suppose.

I thought maybe this was a common problem with rebuilding...

[slimslob]

Re: MP 2550 PCU

Unfortunately that's the only one I have. Its been sitting in the warehouse for a couple of years and I thought I'd give rebuilding one a shot. I'll have to wait until I get another I suppose.

I thought maybe this was a common problem with rebuilding...

If it has been sitting in a warehouse for a couple of years, replace the developer. If you don't want to spend the money, try running about 200 to 300 double sided checkered flags, in sets of 10. This will agitate the developer, purge old toner and adjust the toner density level as detected by the image density sensor.

[copyaction]

Re: MP 2550 PCU

Start with new Developer

[tinfox]

Re: MP 2550 PCU

If it has been sitting in a warehouse for a couple of years, replace the developer. If you don't want to spend the money, try running about 200 to 300 double sided checkered flags, in sets of 10. This will agitate the developer, purge old toner and adjust the toner density level as detected by the image density sensor.

Okay I'll give it a shot

[tinfox]

Re: MP 2550 PCU

Okay I'll give it a shot

So I ran about 100 or so legal and it worked! The copies looked perfect now :-)

Thanks!

[sandmanmac]

Re: MP 2550 PCU

Drum, Drum blade, charge roller

So you didn't rebuild the PCU. Why cut a corner like skipping Dev? It's inexpensive, and part of the PROCESS

EDIT: I hadn't read your final post before posting my thoughts.
Glad it sorted itself out, but when you take shortcuts to save a few $$, strange things can happen. Now it'll probably need a dev change before the drum wears out. Just saying.....

[Polarbear]

Re: MP 2550 PCU

So I ran about 100 or so legal and it worked! The copies looked perfect now :-)

Thanks!

Just as a side note, most newer machines have an sp called "Developer mixing" or similar.

This just agitates the developer by circulating it around the developer tank area without adding toner. It is good when a pcu/machine has been standing for quite some time without having been used. It brings back the triboelectric charge that should be in the developer for it to work properly.

Using this function gets rid of spotty copies most of the time. You could also do about 2 or 3 smc reports afterwards to improve the CQ.

[sturmtrooper]

Re: MP 2550 PCU

Just as a side note, most newer machines have an sp called "Developer mixing" or similar.

This just agitates the developer by circulating it around the developer tank area without adding toner. It is good when a pcu/machine has been standing for quite some time without having been used. It brings back the triboelectric charge that should be in the developer for it to work properly.

Using this function gets rid of spotty copies most of the time. You could also do about 2 or 3 smc reports afterwards to improve the CQ.

Even some machines I would consider older do as well. I think the machine also checks sensor output as well but not positive.

[logrady2331]

Re: MP 2550 PCU

Type 1027 PCU. That is all.....