How is Password used in network printer?

I am assuming you mean you have a printer with a NIC and you are using LPR/LPD to drive print from a server to the printer. Or the individual PCs are driving data directly to the printer with the LPR/LPD protocol.
LPR/LPD does not have provisions for password protecting the device from unauthorized use. More than likely, someone is sending data from the internet to the printer.
Your only recourse is to firewall protect your network to block port 515 access from the internet. If by chance someone internally is sending the data to the printer, your server logs should show who is sending the data.

Well, its getting data from somewhere t print the garbage. I would suspect a bad driver somewhere and if you can hunt it down reinstall it. You may need to check the NIC(JetDirect card if HP) at the printer or the Jet direct box if it doesnt have an internal. It could be a noisy nic causing erratic problems. Typicly a printer printing garbage is result from a bad or wrong driver or perhaps a corrupted application. If it is an HP you can try WebJet admin from HPs website to monitor the printer. It can also help with updating firmware which could be a potential problem.

As far as Passwords the only ones I know that support it are Xerox printers/copiers and such. Im sure it could be done with others but may require special software or drivers that im unaware of.

Hope this helps or gets you in the right direction.

Jason

I think the answer to your problem is not a password protection. You should find out who is sending data to your printer, it doesn't print on its own. Your problem seems to be as simple as wrong driver, probably someone on your network is attached to that printer but with a wrong printer driver. Find out who's doing it and there you go. If it happens with "no one" trying to print then there is someone on internet accessing your printer, check your print sharing configuration or build a small firewall.

I hope it helps.

@lberto