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#21
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HP LaserJet 2200DN -- dirty mark on second side
On 07/16/2017 08:34 PM, I wrote:
Sorry. I forgot to say that I had already turned the printer over and checked the duplexer tray: no sign of any contamination. The Service Manual has diagrams of all kinds of printing errors, but nothing like what I'm seeing. There is one diagram with precise measurements for repeated errors and the printer components that cause the errors at each specific interval -- but nothing for a once-per-page error. For now I can print what I need by doing each page separately and turning the stack over to print the second page, but I really want to find the problem. Maybe somebody else has seen this. You could cross post to the HP newsgroups. There used to be a very active HP expert forum but I cannot remember the name. Also thye Fix Your Own Printer forum may help. Every full width roller in the prinhter will, if damaged or worn, produce at least two defects on an A4 or Legal page when not duplexing. That is not happening so it has to be something weird. If it was in a workshop I would swap out components until it was fixed but that would cost more than a replacement printer. I've bought a(n allegedly) new transfer roller on eBay. It should be here within a week. The (allegedly) new transfer roller arrived today, and I've installed it. I don't see the black mark on the second side, but I don't see anything else much there either: the print on the first side starts off OK but gets lighter across the page, and the second side has only very faint printing. What could cause that? Not a transfer roller fault, surely? And it's the same with the previous toner cartridge too. Perce |
#22
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HP LaserJet 2200DN -- dirty mark on second side
On 07/20/2017 09:17 PM, I wrote:
Sorry. I forgot to say that I had already turned the printer over and checked the duplexer tray: no sign of any contamination. The Service Manual has diagrams of all kinds of printing errors, but nothing like what I'm seeing. There is one diagram with precise measurements for repeated errors and the printer components that cause the errors at each specific interval -- but nothing for a once-per-page error. For now I can print what I need by doing each page separately and turning the stack over to print the second page, but I really want to find the problem. Maybe somebody else has seen this. You could cross post to the HP newsgroups. There used to be a very active HP expert forum but I cannot remember the name. Also thye Fix Your Own Printer forum may help. Every full width roller in the prinhter will, if damaged or worn, produce at least two defects on an A4 or Legal page when not duplexing. That is not happening so it has to be something weird. If it was in a workshop I would swap out components until it was fixed but that would cost more than a replacement printer. I've bought a(n allegedly) new transfer roller on eBay. It should be here within a week. The (allegedly) new transfer roller arrived today, and I've installed it. I don't see the black mark on the second side, but I don't see anything else much there either: the print on the first side starts off OK but gets lighter across the page, and the second side has only very faint printing. What could cause that? Not a transfer roller fault, surely? And it's the same with the previous toner cartridge too. I've tried printing some self-test pages with the old cartridge installed again. Each time it prints the first side OK (considering the age of that cartridge) but leaves the second side blank (yes, it does pull the paper back in as though it is going to print the second side), then just sits there with the red light blinking. If I press the Go button, it does the same thing again: just prints the first side, leaves the second side blank, and flashes the red light. Perce |
#23
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HP LaserJet 2200DN -- dirty mark on second side
"Percival P. Cassidy" wrote:
On 07/20/2017 09:17 PM, I wrote: Sorry. I forgot to say that I had already turned the printer over and checked the duplexer tray: no sign of any contamination. The Service Manual has diagrams of all kinds of printing errors, but nothing like what I'm seeing. There is one diagram with precise measurements for repeated errors and the printer components that cause the errors at each specific interval -- but nothing for a once-per-page error. For now I can print what I need by doing each page separately and turning the stack over to print the second page, but I really want to find the problem. Maybe somebody else has seen this. You could cross post to the HP newsgroups. There used to be a very active HP expert forum but I cannot remember the name. Also thye Fix Your Own Printer forum may help. Every full width roller in the prinhter will, if damaged or worn, produce at least two defects on an A4 or Legal page when not duplexing. That is not happening so it has to be something weird. If it was in a workshop I would swap out components until it was fixed but that would cost more than a replacement printer. I've bought a(n allegedly) new transfer roller on eBay. It should be here within a week. The (allegedly) new transfer roller arrived today, and I've installed it. I don't see the black mark on the second side, but I don't see anything else much there either: the print on the first side starts off OK but gets lighter across the page, and the second side has only very faint printing. What could cause that? Not a transfer roller fault, surely? And it's the same with the previous toner cartridge too. I've tried printing some self-test pages with the old cartridge installed again. Each time it prints the first side OK (considering the age of that cartridge) but leaves the second side blank (yes, it does pull the paper back in as though it is going to print the second side), then just sits there with the red light blinking. If I press the Go button, it does the same thing again: just prints the first side, leaves the second side blank, and flashes the red light. Perce Did you take care to not touch the roller with your fingers? It is unlikely that would cause this problem but the grease from fingers can cause issues. Also at one end of the roller (left end I think?) th roller shaft should be touching an electrical contact, this is essentil to avoid print failures. I have seen these contacts damages when inserting a new roller, sometimes bending the contact very gently will sort that. Tony |
#24
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HP LaserJet 2200DN -- dirty mark on second side
Tony lizandtony at orcon dot net dot nz wrote:
"Percival P. Cassidy" wrote: On 07/20/2017 09:17 PM, I wrote: Sorry. I forgot to say that I had already turned the printer over and checked the duplexer tray: no sign of any contamination. The Service Manual has diagrams of all kinds of printing errors, but nothing like what I'm seeing. There is one diagram with precise measurements for repeated errors and the printer components that cause the errors at each specific interval -- but nothing for a once-per-page error. For now I can print what I need by doing each page separately and turning the stack over to print the second page, but I really want to find the problem. Maybe somebody else has seen this. You could cross post to the HP newsgroups. There used to be a very active HP expert forum but I cannot remember the name. Also thye Fix Your Own Printer forum may help. Every full width roller in the prinhter will, if damaged or worn, produce at least two defects on an A4 or Legal page when not duplexing. That is not happening so it has to be something weird. If it was in a workshop I would swap out components until it was fixed but that would cost more than a replacement printer. I've bought a(n allegedly) new transfer roller on eBay. It should be here within a week. The (allegedly) new transfer roller arrived today, and I've installed it. I don't see the black mark on the second side, but I don't see anything else much there either: the print on the first side starts off OK but gets lighter across the page, and the second side has only very faint printing. What could cause that? Not a transfer roller fault, surely? And it's the same with the previous toner cartridge too. I've tried printing some self-test pages with the old cartridge installed again. Each time it prints the first side OK (considering the age of that cartridge) but leaves the second side blank (yes, it does pull the paper back in as though it is going to print the second side), then just sits there with the red light blinking. If I press the Go button, it does the same thing again: just prints the first side, leaves the second side blank, and flashes the red light. Perce Did you take care to not touch the roller with your fingers? It is unlikely that would cause this problem but the grease from fingers can cause issues. Also at one end of the roller (left end I think?) th roller shaft should be touching an electrical contact, this is essentil to avoid print failures. I have seen these contacts damages when inserting a new roller, sometimes bending the contact very gently will sort that. Tony The roller can be cleaned with isopropyl alcohol if necessary Tony |
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