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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Light band on laser printing
My trusty HP 2100M printer is now printing with a definite light band in
one spot on each page. The cartridge is old (bought new with the printer back in 19-ought-99) but doesn't have that many pages on it (couple thousand). Turning the cartridge to redistribute the toner doesn't fix the problem. Diagnosis? I'm hoping a certain regular here who lives in "Surf City" might answer ... -- You were wrong, and I'm man enough to admit it. - a Usenet "apology" |
#2
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Light band on laser printing
On Feb 21, 6:03*pm, David Nebenzahl wrote:
My trusty HP 2100M printer is now printing with a definite light band in one spot on each page. The cartridge is old (bought new with the printer back in 19-ought-99) but doesn't have that many pages on it (couple thousand). Turning the cartridge to redistribute the toner doesn't fix the problem. Diagnosis? I'm hoping a certain regular here who lives in "Surf City" might answer ... -- You were wrong, and I'm man enough to admit it. - a Usenet "apology" You're going WAY too far with this frugality thing. Try a new toner cartridge. I think you got your money's worth on the last one. G² |
#3
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Light band on laser printing
On Sun, 21 Feb 2010 18:03:56 -0800, David Nebenzahl
wrote: My trusty HP 2100M printer is now printing with a definite light band in one spot on each page. The cartridge is old (bought new with the printer back in 19-ought-99) but doesn't have that many pages on it (couple thousand). Turning the cartridge to redistribute the toner doesn't fix the problem. Diagnosis? I'm hoping a certain regular here who lives in "Surf City" might answer ... Light band in which direction? Lengthwise or widthwise on the paper? Most likely, you need a new cartridge. Even on the shelf in a box, the carts deteriorate. If you can't borrow a cartridge for testing, then just buy a new one. However, if the line is lengthwise, it might be something else, such as a piece of crud stuck in the laser scanner, a burned out transfer film in the fuser, dirty scrubber in the fuser, gouged toner drum, gouged fuser drum, etc. If you're not sure, tear it apart and clean out the dust, dirt, and loose toner. Also see: http://www.FixYourOwnPrinter.com -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#4
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Light band on laser printing
On 2/21/2010 8:05 PM Jeff Liebermann spake thus:
On Sun, 21 Feb 2010 18:03:56 -0800, David Nebenzahl wrote: My trusty HP 2100M printer is now printing with a definite light band in one spot on each page. The cartridge is old (bought new with the printer back in 19-ought-99) but doesn't have that many pages on it (couple thousand). Turning the cartridge to redistribute the toner doesn't fix the problem. Diagnosis? I'm hoping a certain regular here who lives in "Surf City" might answer ... Light band in which direction? Lengthwise or widthwise on the paper? Most likely, you need a new cartridge. Even on the shelf in a box, the carts deteriorate. If you can't borrow a cartridge for testing, then just buy a new one. However, if the line is lengthwise, it might be something else, such as a piece of crud stuck in the laser scanner, a burned out transfer film in the fuser, dirty scrubber in the fuser, gouged toner drum, gouged fuser drum, etc. If you're not sure, tear it apart and clean out the dust, dirt, and loose toner. Also see: http://www.FixYourOwnPrinter.com Thanks. I shoulda said which direction: it's lengthwise, down the page as it's printed. And it's not a sharply-defined light spot but a light area, about 2 inches from the left edge and maybe 3/4" wide or so. It prints in that area, but noticeably lighter. So how much of the image-producing stuff is actually in the printer and not in the cart? I'll check out that DIY link now. -- You were wrong, and I'm man enough to admit it. - a Usenet "apology" |
#5
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Light band on laser printing
David Nebenzahl wrote in message
.com... My trusty HP 2100M printer is now printing with a definite light band in one spot on each page. The cartridge is old (bought new with the printer back in 19-ought-99) but doesn't have that many pages on it (couple thousand). Turning the cartridge to redistribute the toner doesn't fix the problem. Diagnosis? I'm hoping a certain regular here who lives in "Surf City" might answer ... -- You were wrong, and I'm man enough to admit it. - a Usenet "apology" Get into the iron filings and redistibute along the drum, they've got too packed in the one spot so not allowing toner to pass at that point. Requires more than just shaking the cartridge as a filings thing rather than toner thing |
#6
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Light band on laser printing
On 2/22/2010 12:40 AM N_Cook spake thus:
David Nebenzahl wrote in message .com... My trusty HP 2100M printer is now printing with a definite light band in one spot on each page. The cartridge is old (bought new with the printer back in 19-ought-99) but doesn't have that many pages on it (couple thousand). Turning the cartridge to redistribute the toner doesn't fix the problem. Diagnosis? I'm hoping a certain regular here who lives in "Surf City" might answer ... Get into the iron filings and redistibute along the drum, they've got too packed in the one spot so not allowing toner to pass at that point. Requires more than just shaking the cartridge as a filings thing rather than toner thing So you're saying there are iron filings in the toner cartridge? I know copiers use iron filings, I seem to remember in the "developer". I remember my repair guy replacing them in my big honkin' Kodak copier once. So what do I do, just shake the cartridge really hard? -- You were wrong, and I'm man enough to admit it. - a Usenet "apology" |
#7
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Light band on laser printing
David Nebenzahl wrote in message
.com... On 2/22/2010 12:40 AM N_Cook spake thus: David Nebenzahl wrote in message .com... My trusty HP 2100M printer is now printing with a definite light band in one spot on each page. The cartridge is old (bought new with the printer back in 19-ought-99) but doesn't have that many pages on it (couple thousand). Turning the cartridge to redistribute the toner doesn't fix the problem. Diagnosis? I'm hoping a certain regular here who lives in "Surf City" might answer ... Get into the iron filings and redistibute along the drum, they've got too packed in the one spot so not allowing toner to pass at that point. Requires more than just shaking the cartridge as a filings thing rather than toner thing So you're saying there are iron filings in the toner cartridge? I know copiers use iron filings, I seem to remember in the "developer". I remember my repair guy replacing them in my big honkin' Kodak copier once. So what do I do, just shake the cartridge really hard? -- You were wrong, and I'm man enough to admit it. - a Usenet "apology" Hold a magnetic compass nearby, should attract more than magnetised iron, at some point between toner hopper and OPC drum I'm asuming there is a spring loaded cover to the toner that drops in place on removing. Hopefully there is an exposed pulley somewhere and turn it back and forth while holding the cartridge vertically and inverting as well, just one revolution each way may be enough. If not enough repeat more times |
#8
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Light band on laser printing
cog not pulley |
#9
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Light band on laser printing
On 2/22/2010 12:58 AM N_Cook spake thus:
David Nebenzahl wrote in message .com... On 2/22/2010 12:40 AM N_Cook spake thus: David Nebenzahl wrote in message .com... My trusty HP 2100M printer is now printing with a definite light band in one spot on each page. The cartridge is old (bought new with the printer back in 19-ought-99) but doesn't have that many pages on it (couple thousand). Turning the cartridge to redistribute the toner doesn't fix the problem. Diagnosis? I'm hoping a certain regular here who lives in "Surf City" might answer ... Get into the iron filings and redistibute along the drum, they've got too packed in the one spot so not allowing toner to pass at that point. Requires more than just shaking the cartridge as a filings thing rather than toner thing So what do I do, just shake the cartridge really hard? Hold a magnetic compass nearby, should attract more than magnetised iron, at some point between toner hopper and OPC drum I'm asuming there is a spring loaded cover to the toner that drops in place on removing. Hopefully there is an exposed pulley somewhere and turn it back and forth while holding the cartridge vertically and inverting as well, just one revolution each way may be enough. If not enough repeat more times Interesting. Wouldn't mind a second opinion on this. What do you think, Jeff? -- You were wrong, and I'm man enough to admit it. - a Usenet "apology" |
#10
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Light band on laser printing
On Mon, 22 Feb 2010 11:12:47 -0800, David Nebenzahl
wrote: Hold a magnetic compass nearby, should attract more than magnetised iron, at some point between toner hopper and OPC drum I'm asuming there is a spring loaded cover to the toner that drops in place on removing. Hopefully there is an exposed pulley somewhere and turn it back and forth while holding the cartridge vertically and inverting as well, just one revolution each way may be enough. If not enough repeat more times I just spun my 96A cartridge both ways. No toner was visible on the selenium drum. Oddly, this is the first time I haven't seen any visible toner. It usually dumps quite a bit everywhere. I have no idea what's going on. Looking inside the cart at: http://www.futuregraphicsllc.com/lit/tg/hp2100.pdf I don't see anything that might cause this. Weird. Interesting. Wouldn't mind a second opinion on this. What do you think, Jeff? Well, I really don't know. So, I did the experiment. I grabbed a 96A cartridge off the shelf, and waved a compass at the cartridge. The needle did deflect towards the toner cartridge, but very weakly. I then took a small bar magnet and tried to pickup some refill toner I dumped on a piece of paper. Nothing. I then held the magnet to the selenium drum. Nothing, which makes sense because the drum is mostly aluminum. However, I know that there's a magnetic pickup roller inside. If you look at the above rebuilding PDF, at step 17, they refer to a "mag roller" which is really a waste toner scrubber. It's one of these: http://www.bikudo.com/product_search/details/44489/magnetic_roller_compatible_hp3906f.html I have one ripped apart from a different cartridge. The magnetic attraction is VERY weak, but present. However, there's no magnetic particles in the toner that I can see, so I have no idea what they're doing. Maybe it's for MICR toner, which is magnetic. I would make a video clip except that it's 10AM, I'm dead tired, and I have at least 2 hours more work to do. Maybe tomorrow. -- # Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060 # 831-336-2558 # http://802.11junk.com # http://www.LearnByDestroying.com AE6KS |
#11
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Light band on laser printing
On Mon, 22 Feb 2010 14:22:05 -0500, Meat Plow wrote:
I've never seen this but it's worth a try. We used to just shake them. I shake them outside. I've had more than one toner cart dump a black dust on the rug or bench. My office vacuum cleaner doesn't have the right filter, so the dust cloud goes right through the filter bag. I also hit a newly arrived printer with my air compressor to blow out the toner, dust, dirt, and crud before I drag it into the office. That really cuts down on the mess inside. -- # Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060 # 831-336-2558 # http://802.11junk.com # http://www.LearnByDestroying.com AE6KS |
#12
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Light band on laser printing
On 2/22/2010 10:27 PM Jeff Liebermann spake thus:
Hold a magnetic compass nearby, should attract more than magnetised iron, at some point between toner hopper and OPC drum I'm asuming there is a spring loaded cover to the toner that drops in place on removing. Hopefully there is an exposed pulley somewhere and turn it back and forth while holding the cartridge vertically and inverting as well, just one revolution each way may be enough. If not enough repeat more times I just spun my 96A cartridge both ways. No toner was visible on the selenium drum. Oddly, this is the first time I haven't seen any visible toner. It usually dumps quite a bit everywhere. I have no idea what's going on. Looking inside the cart at: http://www.futuregraphicsllc.com/lit/tg/hp2100.pdf I don't see anything that might cause this. Weird. [snip] While this discussion is getting interesting, and I hope it continues, I'd like to report that I took my cartridge out and gave it a good talking to. Spun it around (in several axes), slapped it upside its little head a few times, spun it some more, then put it back in and printed some pages. Whatever the problem was is now gone, so we can safely conclude that the light band was caused by something inside the cart. Maybe some toner clumped together? -- You were wrong, and I'm man enough to admit it. - a Usenet "apology" |
#13
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Light band on laser printing
David Nebenzahl wrote in message
.com... On 2/22/2010 10:27 PM Jeff Liebermann spake thus: Hold a magnetic compass nearby, should attract more than magnetised iron, at some point between toner hopper and OPC drum I'm asuming there is a spring loaded cover to the toner that drops in place on removing. Hopefully there is an exposed pulley somewhere and turn it back and forth while holding the cartridge vertically and inverting as well, just one revolution each way may be enough. If not enough repeat more times I just spun my 96A cartridge both ways. No toner was visible on the selenium drum. Oddly, this is the first time I haven't seen any visible toner. It usually dumps quite a bit everywhere. I have no idea what's going on. Looking inside the cart at: http://www.futuregraphicsllc.com/lit/tg/hp2100.pdf I don't see anything that might cause this. Weird. [snip] While this discussion is getting interesting, and I hope it continues, I'd like to report that I took my cartridge out and gave it a good talking to. Spun it around (in several axes), slapped it upside its little head a few times, spun it some more, then put it back in and printed some pages. Whatever the problem was is now gone, so we can safely conclude that the light band was caused by something inside the cart. Maybe some toner clumped together? -- You were wrong, and I'm man enough to admit it. - a Usenet "apology" You can send toner cartridges by ordinary post so they must be able to take all sorts of rattling in all attitudes without spillage. For some reason , unknown to me, the iron filings are called "developer" in the photocopier world, much the same mechanical process after latent image generation as laser printer, except voltages are different. Nothing ever beat the rotating magnet and filings for toner distribution AFAIK. my page on this sort of stuff http://www.divdev.fsnet.co.uk/copiers.htm -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://diverse.4mg.com/index.htm |
#14
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Light band on laser printing
On Mon, 22 Feb 2010 23:29:52 -0800, David Nebenzahl
wrote: While this discussion is getting interesting, and I hope it continues, This is Usenet. Such discussions never really end. I'd like to report that I took my cartridge out and gave it a good talking to. Spun it around (in several axes), slapped it upside its little head a few times, spun it some more, then put it back in and printed some pages. Whatever the problem was is now gone, so we can safely conclude that the light band was caused by something inside the cart. Maybe some toner clumped together? Yes and congrats. I thought you had already shaken the cart. With a 10 year old cartridge and a rarely used printer, my guess(tm) is that the cart has absorbed some moisture, causing the toner to clump together. The solution is to simply leave the printer turned on for a day, thus cooking the toner cart. A few more lengthwise shakes and some test prints will make sure that things are evenly dried out. However, the bad news is that it usually only happens on nearly empty cartridges. Laser printers are nice about such things as they will print perfectly until the very last page, where it will run out of toner in the middle of a very important document. They don't fade away like ink sprayers. Anyways, you'll probably be buying a new cartridge soon. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
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