| Jeff Liebermann <jeffl@cruzio.com>: Sep 11 01:44PM -0700 On Sun, 10 Sep 2017 13:58:46 -0700 (PDT), "pfjw@aol.com" >Next time, please do not feed the troll. But, but, but, what should I do for entertainment value? The best I can find in sci.electronics.repair is punching reset on a refrigerator and painting stripes on resistors. Lacking anything more interesting, feeding an off topic carbonation question will keep me entertained and out of trouble for at least for a few days. There once was a usenet troll. Who thought he was on a roll. He often did send, some post without end, while waiting for bells that toll. We return you now to whatever you should be doing. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| Mike Coon <gravity@mjcoon.plus.com>: Sep 12 08:51AM +0100 In article <8nsdrcdbg1n686llmr2nf6marlbo3ahhpd@4ax.com>, jeffl@cruzio.com says... > We return you now to whatever you should be doing. To fulfil some higher purpose? Now there's a whole new topic for debate (if I could be bothered...)! Mike. |
| bruce2bowser@gmail.com: Sep 12 03:08AM -0700 On 9/7/2017 5:11 PM, Danny D. wrote: > there is some kind of pragmatic coefficient, that's OK. It works. > I just don't know what I'm doing and why. > Do you? Either way, its nothing that a chemistry book can't fix. (They don't actually bite) |
| Jeff Liebermann <jeffl@cruzio.com>: Sep 12 07:47AM -0700 On Tue, 12 Sep 2017 08:51:15 +0100, Mike Coon >To fulfil some higher purpose? Now there's a whole new topic for debate >(if I could be bothered...)! >Mike. Of course. There is no higher purpose than to delay the inevitable demise of civilization from being buried in the debris left by unrepaired products. Post apocolyptic movies feature mountains of non-functional junk laying around for the actors to hide behind as they shoot at each other. What higher purpose can there be than the repair of everything civilization can produce so that the actors have nothing to hide behind? Without repair, every product would come with an expiration data after which it would self destruct. Without repair, the landfills will overflow with dead devices. Without repair, everyone would be forced to pay full list price as used, refurbished, and reconditioned will cease to exist. As long as we strive to repair, we can be certain that our efforts are for the greater good of mankind, which will end in a utopian society where nothing is wasted and everything lasts forever. No civilization has yet repaired its way to greatness, but we could be the first. <https://www.ifixit.com/Manifesto> -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| "Percival P. Cassidy" <Nobody@NotMyISP.net>: Sep 11 04:17PM -0400 Jeff: I don't see anything recent by you on comp.periphs.printers, so I'll ask here on sci.electronics.repair: I have a LaserJet 2200DN that is having trouble with duplex printing: I followed your procedure that I found online and removed the sticky goop from the solenoid you highlighted as the main problem, and used a piece of that thin adhesive-backed felt, but I checked the other two solenoids and determined that they were not sticking. The first double-sided document I printed -- a single sheet -- printed fine, but trying to print multiple copies produced a paper jam, with a sheet sticking out partway -- on the point of feeding back in to print the second side -- and a sheet in the duplexer tray. Subsequent attempts to print even just one double-sided legal sheet result in a jam: the paper seems to be on the point of feeding back in to print the second side, but there is a "chattering" sound, and the paper can be pulled out easily. If I try with a letter-size sheet, no paper sticks out: the edge is just visible when I open the back -- same when I do the Engine Test. Sometimes there is a "ch-ch-ch-ch" sound just after I turn the printer on -- a sound that I do not recall previously. Before I "attacked" the solenoid, the machine would jam with the paper sticking out further from the normal output slot, and with the leading edge of a page about even with the black roller. Could some parts of the mechanism have become "unsynchronized" while the plate with all the gear wheels was removed and when activating the solenoids enabled springs to turn gear wheels and shafts? -- I did turn them back to the point where the solenoids were preventing them from turning by the spring action. I'd be grateful for any assistance you could provide. Perce |
| Jeff Liebermann <jeffl@cruzio.com>: Sep 11 03:00PM -0700 On Mon, 11 Sep 2017 16:17:07 -0400, "Percival P. Cassidy" >Jeff: I don't see anything recent by you on comp.periphs.printers, so >I'll ask here on sci.electronics.repair: That's because I don't read comp.periphs.printers. >I have a LaserJet 2200DN that is having trouble with duplex printing: >I followed your procedure that I found online That would be: <http://www.LearnByDestroying.com/jeffl/hp2200/hp2200.html> >goop from the solenoid you highlighted as the main problem, and used a >piece of that thin adhesive-backed felt, but I checked the other two >solenoids and determined that they were not sticking. How did you determine that? The printer is at least 10 years old. By now, I would expect the foam on all three solenoids to have devulcanized into a sticky goo. Even the slightest release delay caused by the sticky goo will cause problems. At this point in time, it is better to just assume that all 3 solenoids need cleaning and new felt. You should have taken out all 3 solenoids, cleaned off all 3 solenoids, and applied the replacement felt to all 3 solenoids. Only this solenoid: <http://www.learnbydestroying.com/jeffl/hp2200/HP2200-04.jpg> causes it to paper jam or feed more than one page, but if the other stick, there can be other problems. You should also have checked if any of the solenoid cores are magnetized. They get that way after many years of operation. Since all this was in my instructions, I suggest you re-read the web pages and please follow them this time. >fine, but trying to print multiple copies produced a paper jam, with a >sheet sticking out partway -- on the point of feeding back in to print >the second side -- and a sheet in the duplexer tray. That is the classic symptom of a paper jam caused by sticky solenoids. However, it is also a fair description of what happens when the separation pad (RB2-6474) is worn out or filthy. I suggest getting a "paper jam kit" or "maintenance kit" and do a general cleaning. It's cheap and easy. Something like this: <http://www.ebay.com/120894286540> >when I do the Engine Test. >Sometimes there is a "ch-ch-ch-ch" sound just after I turn the printer >on -- a sound that I do not recall previously. There should not be any ratcheting sound when you turn on or run the printer. I can't tell from where exactly what's wrong, but you may have reassembled the printer incorrectly after cleaning the solenoids. It could also be one of the other solenoids sticking. Use a stethoscope to locate the source of the noise. Also, my favorite screwup is re-installing the solenoids at an angle, and then locking them down with the retaining screw. It looks right, but it won't work. Loosen (not remove) the solenoids and rotate until the hole in the frame aligns with the locating pin. >Before I "attacked" the solenoid, the machine would jam with the paper >sticking out further from the normal output slot, and with the leading >edge of a page about even with the black roller. The distance between the first and 2nd page is a function of how sticky the solenoid might be. The longer the distance, the more sticky. >solenoids enabled springs to turn gear wheels and shafts? -- I did turn >them back to the point where the solenoids were preventing them from >turning by the spring action. No. The various rotating shafts are self aligning. As long as you didn't take apart one of the clutches on the rotating shafts, it should align itself. >I'd be grateful for any assistance you could provide. >Perce Good luck. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| "Percival P. Cassidy" <Nobody@NotMyISP.net>: Sep 11 08:19PM -0400 On 09/11/2017 06:00 PM, Jeff Liebermann wrote: > caused by the sticky goo will cause problems. At this point in time, > it is better to just assume that all 3 solenoids need cleaning and new > felt. I moved the armatures until they touched the foam pads, and there was not the slightest sign of sticking. > stick, there can be other problems. > You should also have checked if any of the solenoid cores are > magnetized. They get that way after many years of operation. No sign of permanent magnetism in any of the solenoids. > "paper jam kit" or "maintenance kit" and do a general cleaning. It's > cheap and easy. Something like this: > <http://www.ebay.com/120894286540> Those parts were replaced a few months ago. That solved the problem that it kept trying to pick up several sheets at once. > have reassembled the printer incorrectly after cleaning the solenoids. > It could also be one of the other solenoids sticking. Use a > stethoscope to locate the source of the noise. I wouldn't really call it a ratcheting sound. It's much softer and "gentler" than that. More like parts rubbing together. > and then locking them down with the retaining screw. It looks right, > but it won't work. Loosen (not remove) the solenoids and rotate until > the hole in the frame aligns with the locating pin. The only solenoid I removed was the first one, the one that did have the sticky goo problem. I was very careful to position it correctly when I reinstalled it. |
| Jeff Liebermann <jeffl@cruzio.com>: Sep 11 05:42PM -0700 On Mon, 11 Sep 2017 20:19:31 -0400, "Percival P. Cassidy" >I moved the armatures until they touched the foam pads, and there was >not the slightest sign of sticking. <http://www.learnbydestroying.com/jeffl/hp4200/Sticky-Relay.jpg> <http://www.learnbydestroying.com/jeffl/hp4200/New-Felt-Pad.jpg> You have to smash the armature hard against the solenoid, simulating what the energized core would do, in order to check for sticky problems. I've found that even the slightest residue on the either the armature or core will cause problems. >No sign of permanent magnetism in any of the solenoids. This is for a different model HP printer, but with the same sticky solenoid problems: <http://www.learnbydestroying.com/jeffl/hp4200/hp4200.html> It still paper jammed on double sided printing even after replacing the pads. Here's a video of the residual magnetism problem with the same solenoids: <http://www.learnbydestroying.com/jeffl/crud/hp2200-solenoid.wmv> (600K) and a rather marginal test with a compass needle: <http://www.learnbydestroying.com/jeffl/crud/hp2200-compass.wmv> If you decide to use a tape head demagnetizer on the solenoid, be sure to unplug the solenoid from the circuitry or you may fry something on the motor controller board. >> <http://www.ebay.com/120894286540> >Those parts were replaced a few months ago. That solved the problem that >it kept trying to pick up several sheets at once. Ok, so much for that theory. Am I correct that it ONLY jams when trying to print double sided? Did you have the paper jam problem immediately after you replaced those parts, or did it take "several months" for the problem to appear? I'm thinking that something might have gummed up the feed roller or coated them with something stick, such as printing sheets of mailing labels with some of the labels removed. That will transfer rubber glue to the rollers. >I wouldn't really call it a ratcheting sound. It's much softer and >"gentler" than that. More like parts rubbing together. I'll stand by my guess(tm) that it was reassembled incorrectly. >The only solenoid I removed was the first one, the one that did have the >sticky goo problem. I was very careful to position it correctly when I >reinstalled it. So much for easy and obvious solutions. I don't know what might be misassembled so the only way to find out is to take it apart again and look for problems. It's a bit tricky to get it to print while disassembled, but not impossible. Good luck 2.0. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| bruce2bowser@gmail.com: Sep 11 01:40PM -0700 Tom Biasi wrote: >> all your unneeded capacitors to the office of the governor of Florida. >> (New and Tested caps only, please). <LOL> > Do you really think this is appropriate? You could say. If there are bad capacitors or inductors in Florida, then maybe its also appropriate now to put your drink down, get up off of the couch, go out into the rain there and replace them. ASAP. |
| You received this digest because you're subscribed to updates for this group. You can change your settings on the group membership page. To unsubscribe from this group and stop receiving emails from it send an email to sci.electronics.repair+unsubscribe@googlegroups.com. |
No Response to "Digest for sci.electronics.repair@googlegroups.com - 9 updates in 3 topics"
Post a Comment