MP3350 Dev spilling

[oldtech]

I have one of these that will just puke the dev out at random. Its on about the third Drum and Dev replacement cycle. It sometimes marks the back of the first page out with toner and some dev. I have changed the dev on a bunch of these things and only this one has this problem.

Where am I going wrong?

[Eric1968]

Have you checked the toner supply unit? Maybe the amount of toner in the development unit is wrong.

[oldtech]

Toner concentration "looks" good, no complaints of light or gray prints. It even did it once right after dev replacement. The first copy after running 2801. I have checked drum ground etc.

[Eric1968]

Are you sure it is developer on the back side of the paper? That means that developer is transferred to the paper. When developer is transferred the charge roller voltage would be too high, so you would have a High Voltage problem.

[E Winter]

I've seen this problem a couple of times but only with this weird PCU wich has to be refitted with separate Parts like Drum, Dev etc. I think the A3025/3030 was the first machine with this PCU type.

We decided not to do refit the units, that's why we just install the good old complete Type1027 PCU. This may be a bit more expensive compared to the parts you normally would install but you also have to consider the saving of time and trouble.

[oldtech]

Yes, I really don't like rebuilding these units, even the drive gears look bad by the time you do it a couple times. I am looking into replacing the whole thing on this problem machine.

And I will check charge bias next time as well.

[TonerMunkeh]

Once these PCU's start showing faults like this, replace them.

The 1027 PCU fits these machines and all their previous incarnations except the old 220/270.

Save yourself the hassle, don't bother rebuilding them, just replace them.

[oldtech]

No toner change to use the 1027 PCU?

[TonerMunkeh]

Far as I know. Ricoh have not long brough out a toner that fits everything from the 1027 to the 3350.

[cobiray]

I had one of the LED's on the erase lamp get broken off and caused a similar issue. You might want to check the lamp array while you've got the unit out.

[Shadow1]

The 1027 PCU fits these machines and all their previous incarnations except the old 220/270.

It fits these too, you just have to break off the tab in front. Unfortunately Ricoh has stopped their direct techs from ordering these - I agree, It's more of a pain that it's worth to rebuild, and the developers don't live long.

[oldtech]

Update... went back and changed dev again. This time I checked some of the drum settings the only thing I noticed was the charge bias was 100v less neg than the default? changed that one back to default and no more dev material on the prints??? I'll see how long it runs this time before I claim that was the fix.

[oldtech]

Only worked a few days, back to pulling dev. Some of the first prints out have dev and toner on the back for an inch or so. Checked the Dev bias connections and found that the dev mag roller shaft don't make good connection, tried shims etc, but nothing made a real difference. Boss is not wild about useing the 1027 assy so I will have to fix this one.

Question....if the fixed -600v dev bias is missing on the first couple rotations...would that cause the symptoms I see? I understand the dev churning creates some attraction but maybe not enough on the first page? The problem seems to go away in a multi copy run. This machine has fax option so it makes a lot of singles.

[TonerMunkeh]

What's your boss's problem with using the 1027 PCU?

Ricoh use them in the Russian C5.

Save yourself the hassle, put a 1027 PCU in the machine to keep the customer happy and then sort the broken one out.

[oldtech]

Money