2553ci Megenta pages

[Samanator]

I have this 2553ci that is putting magenta all over the page. The other colors are fine (see sample). We have brought this machine into the shop for repair.

I swapped the drum unit with another drum unit to see if the problem would follow. It did not. I swapped the magenta developer unit with another magenta developer unit from another working 2553ci we have in the shop and the problem did not follow the original developer unit. No joy in the original machine.

Just to be clear, when I swap a unit or board, if there is no change, I swap it back.

I then tried swapping the high voltage PWB with no joy. When I was doing that, I examined and cleaned all the contacts and the black plastic between the hi voltage board and the developer and drum units. I Swapped the drum/developer relay PWB. No Joy. I swapped one at a time the engine, Feed image PWB, and (because what did I have to lose) the Feed drive PWB. No joy. I took off the Transfer high-voltage PWB and cleaned and the black plastic with all its connectors. No joy.

No help from Kyocera support except to suggest what I have already done.

Any help would be appreciated.

[darry1322]

Re: 2553ci Megenta pages

Tape over the laser slit ( blocking the magenta laser path to the drum) for magenta and see if the magenta goes away for that spot to see if it's a laser.

[Ropariva]

[blackcat4866]

Re: 2553ci Megenta pages

100% agree. +1
=^..^=

[Samanator]

Re: 2553ci Megenta pages

So I finally got to swap the laser from this trouble machine with a laser from the same model we got of lease before it gets picked up. The donor 2553ci machine works fine. When I swapped laser units, the problem did not follow the laser units. The laser from he problem machine works fine, the problem machine still has the problem. Swapped the laser units back. Now the problem machine say the right side cover is open, but its not. UGGG!!

[darry1322]

Re: 2553ci Megenta pages

The trick I mentioned earlier about using tape (or paper) to block the laser path to the drum is an easy way to test for the laser. It only takes a couple of minutes and gives you plenty of info about how to proceed. If you get blank magenta in the location where the laser is blocked then it's laser related and you can focus on laser. If you still have magenta in the blocked area then it's something other than laser.

If it were me, I might still try it anyway just to be sure.

Right side cover interlock works in tandem with front service cover interlock. I've had to shim a few of these before. Kind of a pain to get to.

[Samanator]

Re: 2553ci Megenta pages

I did the cover the laser slit with some tape and see if there was a change, and there was a change. where there was tape blocking the laser, here was no toner on the drum.

That's why I swapped laser units with another machine to see if the problem followed the laser unit. It did not.

I will check the interlocks again.

[blackcat4866]

Re: 2553ci Megenta pages

This might be lucky ... false interlock indications often point to loss of 24vdc at the power supply. That same 24vdc might be supplying the laser also.

The manual that I'm looking at is for the 3552, so connectors may be different, but there is a 24vdc connection between the APC PWB and the engine PWB. By all appearances the low voltage power supply will not be easy to pin out live, but located simply enough for a quick swap, just to see if it helps. =^..^=

[darry1322]

Re: 2553ci Megenta pages

I did the cover the laser slit with some tape and see if there was a change, and there was a change. where there was tape blocking the laser, here was no toner on the drum.

That pretty much means the magenta laser is writing the entire surface of the drum while the print is being made.
I would have put all my money on the laser unit being the issue because I've seen it before.
You've already replaced the engine board and laser unit though.
Wiring or Main PWB? Something in the laser control.

[KYO_OEM]

Re: 2553ci Megenta pages

i agree with Darry....
Interlock will break 24V, but if we missing 24V line, polygon don`t turn and we`ll get c-call for it.
We do not have interlock for 5v communication lines on Iris series.
Something wrong between main <-->engine
Engine new, as a result picture processing on main pwb must be the reason if FFC not damaged

[eddie110171]

Re: 2553ci Megenta pages

Have you checked the grounds on the machine where they contact the magenta drum and charge roller? This would cause an issue that would not move from machine to machine.

[Kyotron]

Re: 2553ci Megenta pages

Have you tried replacing the magenta drum with one of the other drums?
Give this a try in case it's caused by the main charge or the drum.