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disconnect the LPT cable, and try a usb cable, the wierd printing should stop while the cable is disconnected. I'll be willing to bet there is something trying to print or poll the printer from the computer. that is causing the random characters. check to see that there are no other printers configured g to print/connect to same LPT1 port, from an old printer installation. (thus switching to the USB cable). Be also sure to download the latest drivers for your operating system for the OKI, from OKI's website
Yes, well I can´t help you to solve that problem and in fact i´m hoping that you´ve already solven it, cuz right now i got the same problem with my c3450... It worked just fine under vista x64 but now on windows 7 x64 i have the same problem as you have/had! Cheers
for FS-3900DN the latest firmware is the one what you have. BUT there is a separate update firmware for the Network Card !!
Check if you have installed the latest print driver in ALL computers and the OS updated with the latest patches. Q1: The printing issue is consistent when you change computers ? IF yes THEN the issue is within the printer or the network.
Then: Check if you have same issues when printing using the USB (not the network). IF is printing OK when you use the USB but you got trouble using the network THEN something is wrong with the network printing so: -> connect the printer straight to a PC/laptop using a crossover network cable that so you bypass the whole network (LAN) hardware. --> IF is printing OK THEN the problem is within the network hardware(LAN) - you may try to pinpoint by replacing the network cable between the hub/router and the printer. --> IF printing using the crossover cable is NOT OK then the problem is in the printer's network card. Check if the jack or the cable fit well into the printer or if the connector is not loose.
IF printing using USB is NOT OK then the problem may be into the printer. Reload the firmware engine and system + network card... it may help. Q2: When you say: "fails to print unless it's powered OFF / ON" you mean the print job what you sent is waiting into the computer print spooler = the printer is being seen as NOT READY ? or the print job is just missing and you have to restart the printer and after that resend the print job ? ou can chack the printer stat by going to her IP address = open any internet browser and type the ip address. You should see a web page. Check the printer status before sending any print job.