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Laserjet print banding

By Blackcurrant ·
Hi

More printing problems:

Our company uses a HP 4650dn colour laserjet printer.

Several weeks ago, and today, some of the colour printing has had a defect. Photographs display limited orange banding down one side of the page.

http://img215.imageshack.us/img215/8414/band3qg.jpg

The banding generally occurs at 10cm intervals, though on the example above it occurs at 3.5cm intervals.

I have tried using different applications from different machines, using different images. I have tried printing when the printer has been used intensively and after it has been idle for 30 mins.

I have printed the HP print quality test pages and all are fine.

Does anyone have any ideas what may be causing this please?

Thanks

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by j.lupo In reply to Laserjet print banding

It almost looks like there is something on the image roller. I used to have to clean my HP printers frequently. The color can form in patches on parts of the roller. I know this may not help since your test pages are fine, but it doesn't hurt to check the printer and remove the cartridge just to check and clean the parts.

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by Blackcurrant In reply to

Each cartridge has its own image roller, and all the cartridges appeared to be clean. Helpful answer though, thanks :)

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by mjd420nova In reply to Laserjet print banding

Replace the toner cartridge. The enclsed photo sensitive drum sounds like it has been exposed and is picking up the excess toner and depositing it on the page. Also be sure the corona transfer wire is clean. Any dust, dirt or excess toner will cause this. Most common problem is that the toner has cleaned the excess toner off the photo drum and holds it in a seperate hopper, when it gets full, it will overflow and leave streaks just about anywhere it pleases.

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by Blackcurrant In reply to

Spot-on with the right answer. Though, I have never seen a toner hopper inside the printer.

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by HAL 9000 Moderator In reply to Laserjet print banding

Is this the same printer as last time? The one that wouldn't print any colours at all.

No matter I would tend to be looking at the Yellow Toner cartridge being improperly inserted locked in or something along those lines, also look for the yellow pickup for problems along the path as it looks as if there is a problem with excess yellow being deposited prior to the paper going through the fusser.

With these things which collect so much paper dust it's always a good idea to clean out first look at the brand of paper and if that is the real problem it might be worth while changing the supplier. Cheaper isn't always better.

Check all the corona wires for a build up of junk and make sure that they are still there they have been known to break.

If this is the same printer that you asked about last time it's had some major surgery performed so it would be a good idea to check that everything is still in place and no loose screws or things like that.

Lets know how things go.

Col

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by HAL 9000 Moderator In reply to

It sounds as if you have a Toner Pickup problem that may be related to a sensor on the toner cartridges if you pull them all out nd check for a bent sensor somewhere around the Magenta Cartridge that may be the fix to your problem.

If it makes you feel any better I nearly went crazy with a Canon Image Runner that ended up having a bent Sensor Bracket from new and while it looked A OK when that bracket was replaced the unit worked perfectly. But there was only close to 100 hours wasted and God alone knows how much of the Photocopier was replaced. Of course it started off as a minor problem that was impossible to cure and a lot was changed even the sensor on this particular bracket but out of sheer frustration I suggested changing the bracket as just about everything else had been changed and it worked perfectly. Naturally when the bracket was removed and compared to a new one there was a very slight difference that could be seen.

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by Blackcurrant In reply to

Thanks again for taking the time to help out. Another spot-on answer with the cartridge suggestion.

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by Blackcurrant In reply to Laserjet print banding

Thanks for the responses so far :)

The problem began this time after changing the magenta cartridge. I have replaced that, but the effect is still there. The cyan and yellow cartridges are next in line and are due very soon - hopefully one of these is the problem.

I have been a little reluctant to change them until now as the cartridges are >?100 each, and there is another inkjet printer that can print in colour.

And, yes - it is the same printer Hal.

I will keep you posted.

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by Blackcurrant In reply to Laserjet print banding

Changed the fuser - no change, then changed the yellow cartridge... and finally the blue cartridge ran out of juice so I changed that this afternoon, and everything is now fine.

So, Blue was the culprit.

Thanks to everyone for their help.

Cheers and printable beers

BC

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by Blackcurrant In reply to Laserjet print banding

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