the SF7 is a very nice copier as it has a wide allowance of what the voltage & amps are. I myself use an old sega genesis (10V DC 1.2 AMP) adapter. Make sure it's DC power and not AC. If you read on the bottom of your SF7, it tells you the range of power it allows. then, look on your ac adapter you plan on using. If it's inbetween these ranges, it'll work. Buh bye!