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HP Printer USB / Power Cord Issue - Bizarre
Customer has an HP 1300 Laserjet and intends to use USB.
Many attempts to make it work failed - apparently affecting the setup of the DOT port. Finally noticed that HP recommends plugging the printer's AC power into the wall and not into a power strip *and* to use the power cord supplied with the printer. Doing the former (and maybe the latter, I don't know) solved the problem! Hypothesis: The printer has a very susceptible power supply that can't stand any filtering between the printer and the source of AC power. Any others? Comments? Thanks, Fred |
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"Fred Marshall" wrote in message ... The printer has a very susceptible power supply that can't stand any filtering between the printer and the source of AC power. Well it might be that but I suspect it's not quite that exactly.... It's possible that a loop exists and that noise on the mains or another source is coupling into this loop and preventing or corrupting the data on the USB cable. I've seen two pieces of equipment that work fine on their own but which fail/crash when they are connected together. A typical loop might be... power lead of computer case/0V of computer cable/cable screen case.0V of printer power lead of printer The loop may not be exactly like that - it can involve capacitive coupling between signals that aren't connected together directly. It can be very difficult to fix this type of problem as both manufacturers can claim their kit is ok. Sometimes they are forced into this position by the standard for the interface cable between them. Solution: What's usually important is the AREA of the loop so one possible solution is to try and reduce that - perhaps by moving equipment closer together, shortening data cables and removing extension leads or otherwise changing the physical layout to reduce the area. I've had to resort to twisting the mains leads together and plugging them into adjacent wall sockets or adjacent sockets on a filtered mains block. This can sometimes be a bitch to fix. Sometimes doing the opposite of what the theory tells you works for no obvious reason! You can hire monitoring equipment that monitors and records mains transients so if the problem comes and goes you can try and correlate the two. Some makes and models of equipment are probably more susceptible than others but I've no idea if this is true of the kit you mention. Is this in a factory? Got any manufacturing equipment nearby? Radio transmitters? Air conditioning units? Colin |
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